Tag: spaceflight

Japanese billionaire finally concedes his Starship Moon mission won’t happen in 2023

9:14 am

Japanese billionaire Yusaku Maezawa finally admitted publicly today that his manned Moon mission using SpaceX’s Starship/Superheavy rocket won’t happen in 2023 as first announced in 2018.

The most significant part of the announcement? “”We’re not sure when the flight will be,” Maezawa noted on X. Though SpaceX and several news sources claim that federal approval for the next test launch could occur as soon mid-November, Maezawa — as one of SpaceX’s most important customers — might have more detailed non-public information about that approval process.

Even if that second flight get approved and flies in November, it does not mean Maezawa’s manned mission will soon follow. SpaceX will certainly not be ready for manned Starship launches following this test. It will likely require at least a few more unmanned test launches, with each likely delayed months by the same federal bureaucracy that delayed the second test launch by months.

Unless something significant changes in how the federal government is regulating SpaceX at Boca Chica, the first manned flight of Starship is likely years away, no sooner than 2025, but more likely 2026 or 2027.

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Rocket Lab schedules next launch, plans 22 launches in 2024

9:03 am

Rocket Lab has completed its investigation into a September 2023 launch failure and has now scheduled its next Electron launch for the end of November.

More significant, it says it has 22 booked launches scheduled for 2024, a pace that would more than double its previous annual record of 9 launches in 2022.

In its third quarterly report it also revealed that it lost just over $40 million in that quarter, more than last year’s third quarter by 17%. The September launch failure impacted those numbers, though the company’s revenue in the third quarter still grew by 7% from the previous year.

To achieve 22 launches next year will require the company to launch twice a month. With three launchpads (two in New Zealand and one in the U.S.) this is possible, but challenging. Of those launches, nine will attempt to recover and reuse the first stage, and two will not be orbital but suborbital hypersonic tests for the military.

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Strange meandering ridge amidst Martian glaciers

12:21 pm

Overview map

Strange meandering ridge in glacier country

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 21, 2023 by the high resolution camera on Mars Reconnaissence Orbiter (MRO). Its focus is the meandering ridge in the center of the picture, which the scientists intentially describe vaguely as a “ridged flow-like feature”.

The elevation difference between the high and low points within the picture is about 500 feet, though most of that slope occurs in the lighter terrain on the right. The darker area where the ridge is located has no clear elevation trend, though there are hints of depressions and rises within it.

The yellow dot on the overview map above marks this location, deep within the chaos terrain dubbed Deuteronilus Mensae, on the western end of the 2,000 long northern mid-latitude strip I dub glacier country, because practially every image from there shows glacial features.

To underline this fact, the red and white dots mark previous cool images from 2020 and 2021, with the first showing an eroded glacier and the second glacial ice sheets.

The mesa to the east of this picture rises more than 6,000 feet to its peak, as indicated by the black dot. This is also the highest point for this entire grouping of mesas. All are surrounded by a single large apron of material, likely a mixture of alluvial fill and ice.

What however caused the narrow ridge in the picture above? Is it ice or bedrock? If ice why is it so different than the glacial material that seems to surround it? If bedrock, it suggests it is instead an ancient inverted channel created when that ridge was a canyon through which ice or water flowed, compacting the canyon floor. When the terrain around it eroded away it was more resistent and became a ridge instead.

I have no answer. The colors suggest the ridge is rock, not ice, but that is not conclusive.

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Virgin Galactic trims staff and spending

9:08 am

Despite having completed its fifth commercial suborbital flight on November 2, 2023, Virgin Galactic announced yesterday that it is laying off staff and cutting spending.

The number of people laid off was not revealed. Supposedly the company has done this as part of its effort to develop an upgraded version of SpaceShipTwo.

The company reported having $980 million of cash and equivalents on hand at the end of the second quarter this year, when it reported a net loss of $134.4 million. The company has not disclosed its estimated costs for development of the Delta vehicles, but said it expected those vehicles to enter service in 2026. The company expects only limited revenue from VSS Unity, which is able to fly monthly carrying up to four customers at a time.

I instead suspect that demand for suborbital flights is dwindling because of the competition from orbital operations. Had this company started flying a decade ago, as promised numerous times by Richard Branson, it would have been ahead of the curve. It didn’t and thus missed the boat.

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Lucy: Dinkinesh’s moon is actually a contact binary

8:42 am

Dinkinesh's contact binary moon
Click for original image.

As more images have arrived from Lucy’s fly-by of Dinkinesh scientists have discovered that its moon is actually a contact binary.

The Lucy picture to the right, cropped, reduced and sharpened to post here, shows that contact binary on the right.

This image shows the asteroid Dinkinesh and its satellite as seen by the Lucy Long-Range Reconnaissance Imager (L’LORRI) as NASA’s Lucy Spacecraft departed the system. This image was taken at 1 p.m. EDT Nov. 1, 2023, about 6 minutes after closest approach, from a range of approximately 1,010 miles. From this perspective, the satellite is revealed to be a contact binary, the first time a contact binary has been seen orbiting another asteroid.

Data from the fly-by is still being downloaded.

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SpaceX launches 23 Starlink satellites

8:27 am

SpaceX last night successfully launched 23 Starlink satellites, its Falcon 9 rocket lifting off from Cape Canaveral.

The first stage successfully completed its eleventh flight, landing on a drone ship in the Atlantic.

The leaders in the 2023 launch race:

80 SpaceX
50 China
14 Russia
7 Rocket Lab
7 India

American private enterprise now leads China 92 to 50 in successful launches, and the entire world combined 92 to 79. SpaceX by itself once again leads the rest of the world (excluding American companies) 80 to 79.

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The grand Valles Marineris of Mars

11:30 am

The grand canyon of Mars
Click for original image.

Time for another cool image of the grand canyon of Mars, Valles Marineris. The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on May 24, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a small section of the floor of this gigantic canyon, where orbital data has detected light-toned materials. From the caption:

Many of the Valles Marineris canyons, called chasmata, have kilometer-high, light-toned layered mounds made up of sulfate materials. Ius Chasma, near the western end of Valles Marineris, is an exception.

The light-toned deposits here are thinner and occur along both the floor and walls, as we see in this HiRISE image. Additionally, the sulfates are mixed with other minerals like clays and hydrated silica. Scientists are trying to use the combination of mineralogy, morphology, and stratigraphy to understand how the deposits formed in Ius Chasma and why they differ from those found elsewhere in Valles Marineris.

The picture however gives no sense of the monumental terrain that surrounds it.
» Read more

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Three European nations sign deal with Arianegroup for use of Ariane-6

9:12 am

In a separate deal outside of the European Space Agency, Germany, France, and Italy have signed a deal with the private rocket company Arianegroup to use its still unlaunched Ariane-6, assuming the company can reduce costs.

The agreement will provide €340 million ($365 million) of financing a year for Arianespace’s Ariane 6 rocket in exchange for a commitment to an 11% cut in costs. The rocket will also be awarded at least four missions from public institutions a year, while the lighter Vega C launcher will get at least three.

Essentially the deal is intended to keep Ariane-6 afloat, as its high cost has made it difficult to attract customers. At the same time, the contract demands those costs be reduced, and adds pressure to that demand by noting that future and additional launches will be awarded on a purely competitive bidding process. It appears these three countries will open bidding not only to the new rocket startups being developed in Europe, but American rocket companies as well.

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Japan delays asteroid mission due to its rocket problems

9:02 am

Japan’s space agency JAXA has decided to delay its Destiny+ mission to the asteroid Phaethon until 2025 due to the continuing problems getting its Epsilon-S rocket off the ground.

Epsilon-S is intended as an upgrade to Japan’s Epsilon rocket, but its development has been plagued by failures. In October ’22 there was a launch failure of Epsilon, and in July ’23 the second-stage solid-fueled motor of Epsilon-S exploded during a test.

Phaethon is the parent asteroid of the Geminid meteor shower that occurs each year in December. According to the original plan Destiny+ would have done its fly-by of the asteroid in 2029. No new arrival date has been announced.

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Two Russian satellites — one thought defunct — have been tracked in rendezvous maneuvers

8:51 am

The American commercial satellite tracking company has over the past two years identified two Russian satellites — one thought defunct — that have rendezvoused and done proximity maneuvers.

Resurs-P3 — a Russian Earth observation satellite — performed a large maneuver in November 2022 after years of inactivity, and approached the Russian military satellite Cosmos-2562, according to a LeoLabs briefing.

The maneuver by Resurs-P3 “placed it in an entirely new orbit shared by Russian assets with non-publicly disclosed payloads,” said the briefing. “Based on the approaches observed by LeoLabs, it’s highly likely that Cosmos-2562 has an electro-optical payload and has collected high-resolution imagery of Resurs-P3.”

This new data further documents the long-term classified Russian effort to develop such satellite maneuvering capability, both to track and inspect its own satellites as well as do the same to the satellites of others. The unstated capability also includes the ability to destroy a satellite also, once rendezvous is achieved.

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Astra secures temporary investment funding to keep it afloat

8:44 am

Astra announced yesterday that it has secured temporary funding from private sources to cover its shortfall of cash and allow it to secure additional funds to keep it alive. From the second link:

In a statement issued after the close of trading, Astra said that JMCM Holdings LLC and Sherpa Venture Funds II, LLP, which it described as affiliates of two early investors in Astra, agreed to provide $13.4 million in “initial financing” as part of a non-binding term sheet Astra announced Oct. 23 that sought to raise $15 million to $25 million.

As part of the agreement, the investors will purchase the $8 million loan that Astra had from an unnamed institutional investor from August. Astra had defaulted on the terms of the loan agreement last week when its cash reserves dropped below $10.5 million, triggering a $3.1 million payment at a higher interest rate. The investors will also provide a $3.05 million bridge loan due Nov. 17, and purchase warrants for Astra stock.

The company is not out of the woods quite yet. It needs to obtain new investment capital by November 17th, when that bridge loan comes due.

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Martian lava that buried a crater

5:21 pm

Martian lava flow through crater
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 24, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a lava flow that cut through an older 2-mile-wide crater, mostly burying it as it burst through the crater’s southwest and northeast rims. From the caption:

A lava channel extends from the feature and continues 60 kilometers to the northeast, growing deeper along its path. The circular formation is likely an eroded impact crater whose walls have been breached by the lava as it surrounded the rim and then infilled the crater. Alternatively, it could represent the location of a volcanic vent that sourced some of the lavas that formed the channel.

» Read more

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Galaxies within galaxies within galaxies

9:54 am

Galaxies within galaxies
Click for original image.

Time another cool galaxy image! The picture to the right, cropped, reduced, sharpened, and annotated to post here, was taken by the Hubble Space Telescope as part of a survey project of galaxies where past supernovae had occurred. From the caption:

The location of this faded supernova was observed as part of a study of multiple hydrogen-rich supernovae, also known as type II supernovae, in order to better understand the environments in which certain types of supernovae take place.

Though the picture’s resolution was reduced to post here, I have also included insets at the full released resolution of three of background galaxies, one of which (on the uppermost right) appears to have a second smaller galaxy either associated with it or is another background galaxy even farther away. Such background galaxies are always seen Hubble images, which starkly tell us that the universe is far vaster than we can imaging, with more stars than we can conceive.

The galaxy featured here is interesting in its own right. Though it appears to be a spiral galaxy, its arms are very indistinct, suggesting that is sits between that of an elliptical galaxy (no arms, just a cloud of stars) and a spiral (with well-defined arms).

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Astra defaults on debt agreement

10:25 am

The rocket startup Astra revealed on Friday that it was unable to meet the requirements of one of its investors that it maintain at least $10.5 million in cash reserves, and thus defaulted on that debt agreement.

Astra twice last month failed to meet minimum cash reserve requirements associated with a $12.5 million note issuance to New Jersey investment group High Trail Capital.

The debt raise first required that Astra have “at least $15.0 million of cash and cash equivalents” on hand. That liquidity requirement was adjusted after Astra failed to prove compliance a first time, to require “at least $10.5 million of unrestricted, unencumbered cash and cash equivalents.” Having fallen out of compliance a second time, Astra now owes $8 million on the aggregate principal investment.

Sadly, it appears the end for this company is coming.

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SpaceX launches 23 Starlink with a 1st stage flying for a record-setting 18th time

5:46 pm

SpaceX today successfully launched 23 Starlink, its Falcon 9 rocket lifting off from Cape Canaveral and using a first stage flying for a record-setting 18th time.

The first stage landed successfully on its drone ship in the Atlantic.

The leaders in the 2023 launch race:

79 SpaceX
50 China
14 Russia
7 Rocket Lab
7 India

American private enterprise now leads China 91 to 50 in successful launches, and the entire world combined 91 to 79. SpaceX by itself is once again tied the rest of the world (excluding American companies) 79 to 79.

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Ingenuity completes very short 65th flight

2:31 pm

Overview map
Click for interactive map.

Ingenuity yesterday completed a very short 48 second flight that shifted its position only slightly to the west, by about 23 feet. The distance, time, and highest elevation (33 feet) matched the flight plan exactly.

The green dot on the overview map above indicates its present position, with the blue dot marking Perseverance’s location. This particular flight was so short that it actually fits entirely within that green dot. Furthermore, the helicopter’s next flight, scheduled for today as well, is intended to also only reposition the helicopter, but even less so, moving only two feet or so sideways while rising only ten feet.

It appears the engineering team is preparing the helicopter for the upcoming solar conjunction, when the Sun will be between the Earth and Mars and no communications will be possible for several weeks. Such conjunctions occur about every two years, with this one beginning on November 6th and lasting until November 29th. Getting the helicopter in the right spot during that down time will increase the chances for regaining communications afterward. Since Perseverance acts as a relay station, Ingenuity must get placed in a spot where there is a direct line of communications, blocked by no objects or intevening rise in land.

Note that all the Martian rovers and orbiters are preparing for conjunction right now.

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Mars geology that only makes sense by digging deeper

1:54 pm

Not-so baffling Martian geology
Click for original image.

Today’s cool image is a perfect example of why nothing in science research should ever be taken at face value, without digging a bit deeper. The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on October 5, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

First an important technical point. Though the electronics unit for one of the camera’s color filters is still not working — causing a blank strip down the center of all black & white images, the camera team has gotten around this problem by inserting in that strip other color filter data, thus creating a complete image as you see to the right. This work-around means that MRO’s capabilities, though showing signs of age, will continue almost as good as before.

As for the image itself, when I first looked at it, I was baffled by the striking contrast between the mottled and rough ground in the lower left, and the almost featureless and smooth terrain everywhere else. Why this sudden transition? What could cause it? That inexplicable contrast demanded I post it as a cool image.
» Read more

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China launches military satellite

12:13 pm

China today successfully launched a military satellite, its Long March 7 rocket lifting off from its coastal Wenchang spaceport.

As this launch was on the coast, the rocket’s lower stages likely landed in the ocean harmlessly.

The leaders in the 2023 launch race:

78 SpaceX
50 China
14 Russia
7 Rocket Lab
7 India

American private enterprise still leads China 90 to 50 in successful launches, and the entire world combined 90 to 79. SpaceX by itself is trails the rest of the world (excluding American companies) 78 to 79.

Hat tip to BtB’s stringer Jay for the link.

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Hubble snaps an ultra-violet view of Jupiter

9:59 am

Jupiter in ultra-violet

Cool image time! Using the Hubble Space Telescope, scientists have taken a false-color ultra-violet image of Jupiter. That picture is to the right, cropped, reduced and sharpened to post here.

This newly released image from the NASA Hubble Space Telescope shows the planet Jupiter in a color composite of ultraviolet wavelengths. Released in honor of Jupiter reaching opposition, which occurs when the planet and the Sun are in opposite sides of the sky, this view of the gas giant planet includes the iconic, massive storm called the “Great Red Spot.” Though the storm appears red to the human eye, in this ultraviolet image it appears darker because high altitude haze particles absorb light at these wavelengths. The reddish, wavy polar hazes are absorbing slightly less of this light due to differences in either particle size, composition, or altitude.

The data used to create this ultraviolet image is part of a Hubble proposal that looked at Jupiter’s stealthy superstorm system. The researchers plan to map deep water clouds using the Hubble data to define 3D cloud structures in Jupiter’s atmosphere.

By comparing this ultra-violet image with Hubble’s optical view as well as Webb’s infrared view, scientists can study Jupiter’s atmosphere much like meteologists study the Earth’s, using multi-wave satellite observations.

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Sierra Space: Tenacity is complete and ready for ground testing

9:50 am

Sierra Space announced yesterday that its reuseable Tenacity cargo freighter, the first of its Dream Chaser mini-shuttles, is now complete and ready shipment to NASA’s test facilities in Ohio for ground testing.

The spacecraft hopefully will fly next year. Though this is four years behind schedule, it signals an important milestone for the company, and suggests its operational pace will pick up afterward. Though its arrival comes very late in ISS’s lifespan, the coming arrival of many private space stations, including Sierra’s own, will likely provide it many customers.

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Musk: Starlink “has achieved breakeven cash flow”

9:45 am

In a tweet yesterday, Elon Musk revealed that Starlink “has achieved breakeven cash flow,” adding that “Starlink is also now a majority of all active satellites and will have launched a a majority of all satellites cumulatively from Earth by next year.”

This means that SpaceX achieved this goal using only its Falcon 9 rocket. Originally the company thought it had to have Starship to get enough satellites into orbit to operate the constellation. Because of delays in developing Starship (right now mostly caused by red tape in the federal government), the company ramped up the launch pace using just Falcon 9, and apparently got the job done.

The profits from Starlink can now be used to further develop Starship and Superheavy, assuming the federal government ever gets out of the way.

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Norway inaugurates its Andoya spaceport

9:39 am

Map of Norway showing Andoya

Norway yesterday announced the opening its new Andoya spaceport in the far north of the country, where it hopes will become a hub for the emerging new commercial launch industry.

The location is indicated by the map to the right, in the Arctic and farther north than any other planned spaceport, making it excellent for satellites going into polar orbit.

The launch base, which eventually will have several launch pads, was built by Norwegian public company Andoya Space, on a site which until now has only been used for firing suborbital scientific experiment rockets.

Spectrum, a two-stage craft capable of carrying up to one tonne and developed by the German start-up Isar Aerospace, is scheduled to be the first rocket to be launched from island which is located near the idyllic Lofoten archipelago.

If Norway’s government works better than Great Britain’s in issuing launch permits, this spaceport will steal all business from the UK’s own two spaceports being built in Scotland.

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Iceland signs Artemis Accords

9:29 am

Though no press announcement was ever released, it appears that Iceland signed the Artemis Accords sometime in October, according to small mention in the the press release announcing the signing of the Netherlands.

The mention was so small I missed it. In fact, so apparently did NASA, as Iceland did not issue its own press release. The U.S. likely found out about the signing through private diplomatic communications.

This brings the total number of nations now part of this American space alliance to thirty-one, as follows: Argentina, Australia, Bahrain, Brazil, Canada, Columbia, Czech Republic, Ecuador, France, Germany, India, Iceland, Israel, Italy, Japan, Luxembourg, Mexico, the Netherlands, New Zealand, Nigeria, Poland, Romania, Rwanda, Saudi Arabia, Singapore, South Korea, Spain, the United Kingdom, the United Arab Emirates, the Ukraine, and the United States.

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Lucy discovers second small asteroid orbiting Dinkinesh

9:15 am

Dinkinesh as seen by Lucy

During its November 1, 2023 fly-by of the asteroid Dinkinesh the asteroid probe Lucy surprisingly discovered that the asteroid was actually a binary, with a second smaller asteroid orbiting it.

The picture to the right, cropped, reduced, and sharpened to post here, was taken by Lucy’s camera within a minute of the probe’s closest approach of 270 miles. The second asteroid is partly blocked by Dinkinesh.

In the weeks prior to the spacecraft’s encounter with Dinkinesh, the Lucy team had wondered if Dinkinesh might be a binary system, given how Lucy’s instruments were seeing the asteroid’s brightness changing with time. The first images from the encounter removed all doubt. Dinkinesh is a close binary. From a preliminary analysis of the first available images, the team estimates that the larger body is approximately 0.5 miles (790 m) at its widest, while the smaller is about 0.15 miles (220 m) in size.

The nature of both asteroids appears to lie between a rubble pile (like Bennu) or a solid smooth rock (like Eros), suggesting we are now beginning to see aspects of the overall evolution of asteroids over time.

So far only a few images from this fly-by have been released. It will take a week for the rest of the data from the fly-by to beamed back to Earth. However, these images prove that the prime purpose of this fly-by was successful, proving that Lucy is operating as planned, able to point, manuever, and obtain its data during such a fly-by. When it arrives in the Trojan asteroids in 2027 it will be able to do its prime mission.

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During landing Shenzhou’s single parachute appeared damaged

10:01 am

A closer look at imagery during the descent by parachute of China’s manned Shenzhou capsule, bringing three astronauts back from Tiangong-3 after a five month mission on October 31, 2023, shows that the capsule’s single parachute had a ripped hole.

In some of the footage, a patch of blue sky can be seen through the red-and-white-banded parachute. Inside the capsule were Shenzhou 16 mission commander Jing Haipeng and crewmates Zhu Yangzhu and Gui Haichao — the latter pair returning to Earth after their first mission to space.

Such a sizable hole, which was visible before a white cloud of vented propellant left the Shenzhou capsule, has not been reported during earlier missions. It did not, however, seem to affect operations.

The landing however was very rough, with the capsule tumbling several times after hitting the ground.

Considering that China presently as three astronauts on Tiangong-3 that have to come home in their own Shenzhou capsule, using this same parachute system, finding out what happened seems imperative. Developing its next generation larger capsule, which will return using three parachutes, also appears essential.

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Senate passes bill that gives NASA and Commerce responsibility for removing space junk

9:27 am

The Senate on October 31, 2023 passed a bill that requires NASA to develop several space junk removal projects while giving the Commerce department the responsibility of identifying what space junk needs to be removed.

The central part of the bill would direct NASA to establish an active debris removal program. Tnat includes creating “a demonstration project to make competitive awards for the research, development, and demonstration of technologies leading to the remediation of selected orbital debris.” It would also require NASA to enter into a partnership to fly a demonstration mission to remove debris.

The debris that could be removed by those demonstrations would come from a list developed by the Department of Commerce to identify debris “to improve the safety and sustainability of orbiting satellites and on-orbit activities.” The Department would also lead work on best practices for space traffic coordination. The bill directs the National Space Council to lead an update of the federal government’s Orbital Debris Mitigation Standard Practices.

Though unstated, this bill appears to be a direct slap at the FCC’s effort under the Biden administration to claim the power to regulate space junk, despite its lack of statutory authority to do so. In fact, the Senate underlined that slap in the face by also passing a bill that demanded the FCC streamline its regulatory overreach rather than expand it.

Neither bill is law yet, and it is unclear whether the House will agree to either. The Senate has sent the space junk bill to the House previously without passage.

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A seasonal map of the cloudy parts of Mars

9:10 am

Seasonal map of the cloudy parts of Mars
Click for original image.

Though Mars’ very thin atmosphere (1/thousandth that of Earth) is generally clear, it does have clouds that come and go. A project begun in 2022 using citizen scientists to identify these clouds and the seasons they appear the most, dubbed Cloudspotting on Mars, has now published its first paper, available here.

The graph to the left, Figure 9 in the paper, shows two seasonal Mars maps, one indicating the daytime seasonal frequency of clouds and the other their nightime frequency. From the paper:

The seasonal evolution of all clouds as a function of latitude for both daytime and nighttime are shown in Fig. 9. During the clear season until [mid-summer in the northern hemisphere] … there are several regions where clouds occur frequently: in the equatorial region (annotated as 1), at mid-latitudes (2), in the southern polar region (3), and to a lesser extent in the northern polar region [at the start of summer]. From [late fall to mid-autumn in the north], daytime clouds occur primarily at mid-latitudes, but are observed at nearly all latitudes between 70°S and 60°N (4). At night, there is one broad population from 30°S to 30°N (clouds are more frequent in the equatorial region at night), but [in autumn], clouds occur frequently between 30°N and 50°N as well. [In mid-spring] the number of observed nighttime clouds increases in the southern hemisphere, especially near 50°S. There is a strong decrease in the number of peaks just before [the late northern autumn and the late southern sping] at nearly all latitudes except around 50°S and 20°N at night. [Once northern winter arrives], clouds are observed between about 60°S and 60°N as well as both polar regions, although nighttime clouds between 0°N and 30°N occur relatively less frequently.

The low-latitude clouds during the clear season (1), which are observed more frequently at night, occur at high altitudes, 65–80 km during the day and 55–70 km at night; this is the aphelion equatorial mesospheric cloud population studied in depth by Slipski et al. (2022) and in which previous observations have spectrally confirmed CO2-ice.

Martian seasons

The bracketed words indicating seasons above replace the longitudal numbers the scientists use to indicate the seasons, and are used on these two graphs. The figure to the right shows what the longitude numbers represent in the graphs’ X-axis.

The project continues if any of my readers want to join in.

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