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Crash site of Vikram found

December 2, 2019 at 4:09 pm Robert Zimmerman Points of Information

Click for full image.

Using a mosaic of Lunar Reconnaissance Orbiter (LRO) images, citizen scientist Shanmuga Subramanian located on the Moon the debris and impact point for India’s Vikram lander that crashed there in September, an identification that has since been confirmed by LRO scientists.

The image on the right, reduced to post here, has been modified by the scientists to bring out the features that changed before and after the impact.

After receiving this tip the LROC team confirmed the identification by comparing before and after images. When the images for the first mosaic were acquired the impact point was poorly illuminated and thus not easily identifiable. Two subsequent image sequences were acquired on 14, 15 October and 11 November. The LROC team scoured the surrounding area in these new mosaics and found the impact site (70.8810°S, 22.7840°E, 834 m elevation) and associated debris field. The November mosaic had the best pixel scale (0.7 meter) and lighting conditions (72° incidence angle).

The debris first located by Shanmuga is about 750 meters northwest of the main crash site and was a single bright pixel identification in that first mosaic (1.3 meter pixels, 84° incidence angle). The November mosaic shows best the impact crater, ray and extensive debris field. The three largest pieces of debris are each about 2×2 pixels and cast a one pixel shadow.

No word yet on what this new information reveals about Vikram’s failure.

2 comments Chandrayaan-2, engineering, India, LRO, Lunar Reconnaissance Orbiter, Moon, spaceflight, Vikram

India successfully launches Earth observation satellite plus 12 cubesats

November 26, 2019 at 9:57 pm Robert Zimmerman Points of Information

India today successfully used its PSLV rocket to launch its own Cartosat-3 Earth observation satellite plus 12 cubesats for the commercial company Planet.

This was India’s fifth launch in 2019.

The leaders in the 2019 launch race remain unchanged:

26 China
18 Russia
11 SpaceX
7 Europe (Arianespace)

China leads the U.S. 26 to 23 in the national rankings.

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India confirms details of Vikram’s crash on Moon

November 21, 2019 at 8:52 am Robert Zimmerman Points of Information

India’s government has finally officially admitted that its Vikram lunar lander crashed in September.

In a written answer to a question posed to the Department of Space in Lok Sabha, Minister of State in the Prime Minister’s Office (PMO) Jitendra Singh said the “reduction in velocity” of the Vikram lander during the final phase of its descent on the moon’s surface “was more than the designed value”. As a result, Vikram “hard-landed” on the moon “within 500 metres of the designated landing site”, he said.

…“The first phase of descent was performed nominally from an altitude of 30 km to 7.4 km above the moon surface. The velocity was reduced from 1,683 m/s to 146 m/s. During the second phase of descent, the reduction in velocity was more than the designed value. Due to this deviation, the initial conditions at the start of the fine braking phase (final phase below 7.4 km altitude) were beyond the designed parameters. As a result, Vikram hard-landed within 500 m of the designated landing site,” the minister said in a written answer in the Lok Sabha.

Except for the detail that they think Vikram landed within 500 meters of its planned landing site, this answer really doesn’t tell us much new. It was very obvious during the landing that the spacecraft was traveling too fast as it began its final braking phase, and that it then descended much too fast thereafter.

In fact, the couched language and the unwillingness so far of ISRO, India’s space agency, to provide a detailed report on the failure does not reflect well on them. This kind of cutting edge engineering requires a hard kind of intellectual honesty. They have so far not shown that kind of honesty in their response to this failure.

5 comments Chandrayaan-2, competition, engineering, government, India, ISRO, Moon, policy, politics, spaceflight, Vikram

India targets Nov 2020 for new lunar lander mission

November 14, 2019 at 9:24 am Robert Zimmerman Points of Information

The new colonial movement: Sources inside India’s space agency ISRO yesterday revealed that they are now working to build and fly another lunar lander/rover, dubbed Chandrayaan-3, with a target launch date of November 2020, only one year from now.

Isro has formed multiple committees — an overall panel and three sub-committees — and held at least four high-level meetings since October. The new mission will include only a lander and rover, as the Chandrayaan-2 orbiter is functioning well. On Tuesday, the overview committee met with the agenda of reviewing the configuration of Chandrayaan-3. It also looked into the recommendations of various sub-committees on propulsion, sensors, overall engineering, navigation and guidance.

The Chandrayaan-2 orbiter had provided the propulsion capabilities to get the Vikram lander (with rover) to lunar orbit earlier this year, only to have the lander fail shortly before touchdown. To do this new mission without an orbiter will require adding a propulsion unit to the rover/lander. They are also looking at strengthening the lander’s legs to better resist a high velocity landing.

Kudos to ISRO for moving so quickly. There is no reason a replacement lander/rover should take years to build. They already know what to do, they need only do it again, with upgrades designed to avoid the failure in September.

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Chandrayaan-2 releases more lunar images

November 13, 2019 at 9:44 am Robert Zimmerman Points of Information

Click for full image.

The Chandrayaan-2 science team today released several new images from the spacecraft, while also showcasing their ability to use those images to produce 3D oblique simulations, as shown to the right. This oblique view of Lindbergh Crater was created from an overhead view using computer software that estimated the elevations from the image.

The spacecraft’s high resolution camera can resolve objects as small as sixteen feet across, which is the best resolution yet for any lunar orbiter.

No word yet on whether they have been able to find and image their failed Vikram lander.

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India releases first radar images from Chandrayaan-2

October 23, 2019 at 12:45 pm Robert Zimmerman Points of Information

Click for full image.

India yesterday released the first radar images produced by its lunar orbiter, Chandrayaan-2, the best such images yet produced by any spacecraft. As their press release notes:

Synthetic Aperture Radar (SAR) is a powerful remote sensing instrument for studying planetary surfaces and subsurface due to the ability of the radar signal to penetrate the surface. It is also sensitive to the roughness, structure and composition of the surface material and the buried terrain.

Previous lunar-orbiting SAR systems such as the S-band hybrid-polarimetric SAR on ISRO’s Chandrayaan-1 and the S & X-band hybrid-polarimetric SAR on NASA’s LRO [Lunar Reconnaissance Orbiter], provided valuable data on the scattering characterisation of ejecta materials of lunar impact craters. However, L & S band SAR on Chandraayan-2 is designed to produce greater details about the morphology and ejecta materials of impact craters due to its ability of imaging with higher resolution (2 – 75m slant range) and full-polarimetric modes in standalone as well as joint modes in S and L-band with wide range of incidence angle coverage (9.5° – 35°). In addition, the greater depth of penetration of L-band (3-5 meters) enables probing the buried terrain at greater depths. The L & S band SAR payload helps in unambiguously identifying and quantitatively estimating the lunar polar water-ice in permanently shadowed regions.

The image on the right, cropped and reduced to post here, is from one of the two images released. The brighter areas indicate rougher terrain as well as the location of ejecta from the crater, some of which is below the surface and is not obvious in optical images.

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LRO’s 2nd attempt to find Vikram comes up empty

October 23, 2019 at 9:25 am Robert Zimmerman Points of Information

In their second attempt to find India’s failed lunar lander Vikram, the science team of Lunar Reconnaissance Orbiter (LRO) were unsuccessful in spotting it.

A project scientist of Nasa’s LRO mission confirmed that the space agency’s second attempt to locate Vikram had come up empty. “The Lunar Reconnaissance Orbiter imaged the area of the targeted Chandrayaan-2 Vikram landing site on October 14 but did not observe any evidence of the lander,” Noah Edward Petro, the project scientist told news agency PTI.

Petro explained that Nasa compared the images shot by the LRO on October 14 with an image of the same area before Vikram’s landing. Nasa used a technique that would help it spot any signs of impact on the lunar surface indicating Vikram’s possible location. However, the images revealed nothing.

“It is possible that Vikram is located in a shadow or outside of the search area. Because of the low latitude, approximately 70 degrees south, the area is never completely free of shadows,” John Keller, deputy project scientist of Nasa’s LRO mission, explained while speaking to news agency PTI.

Based on the data obtained during the landing attempt, it appeared that Vikram should have crashed within a relatively small target area. That they haven’t seen it yet suggests that it landed within a shadowed area that will take time for the Sun to reach, if ever, or that it is farther away that expected, which implies that during landing much more went wrong than presently believed.

2 comments engineering, India, LRO, Lunar Reconnaissance Orbiter, Moon, science, spaceflight, Vikram

First images from Chandrayaan-2

October 9, 2019 at 8:45 am Robert Zimmerman Points of Information

Click for the full image.

India has released the first image from the high resolution camera on its Chandrayaan-2 lunar orbiter.

The image on the right, cropped to post here, is from that image and shows objects as small as 10 inches across, which is better than the 20 inch resolution obtained by the U.S.’s Lunar Reconnaissance Orbiter (LRO). Depending on orbit, they should therefore eventually be able to image their crashed Vikram lander with more detail. It also means they can supplement and improve on data from LRO, a significant achievement for India.

Additionally they report that all instruments on board are functioning normally.

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LRO scientists release image of Vikram landing site

September 27, 2019 at 10:28 am Robert Zimmerman Points of Information

Click for full image.

The Lunar Reconnaissance Orbiter (LRO) science team yesterday released their high resolution image taken of the area where it is believed India’s lunar lander Vikram crashed.

The image to the right is not that image, but an oblique overview showing where that landing region is, the center of which is indicated by the white cross. Vikram was aiming for this flat region between the Simpelius N and Manzinus C craters.

In releasing the image, the scientists explained what they thought were the reasons they have so far failed to find Vikram.

We note that it was dusk when the landing area was imaged and thus large shadows covered much of the terrain, perhaps the Vikram lander is hiding in a shadow. The lighting will be favorable when LRO passes over the site in October and LROC will attempt to image the lander at that time.

You can explore the actual image at the link. It is quite large, though their viewer there allows you to zoom in and move about, inspecting each grid area very closely. As they note, there are a lot of shadowed areas.

LRO’s high resolution camera can see objects as small as Vikram, even if broke up somewhat on landing. The key for discovery will be timing. LRO will have to pass over at a time when the lander is not in shadow.

UPDATE: Below the fold is a side-by-side comparison of this region, with mid-day on the left and the dusk LRO image on the right, created by Rex Ridenoure of Ecliptic Enterprises.and graciously provided to me.
» Read more

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LRO fails to spot Vikram on Moon

September 19, 2019 at 9:32 am Robert Zimmerman Points of Information

Despite successfully taking high resolution images of the area on the Moon where it is thought India’s Vikram crash-landed two weeks ago, the Lunar Reconnaissance Orbiter (LRO) science team has been unable to identify it in those images.

LRO’s Lunar Reconnaissance Orbiter Camera instrument, or LROC, imaged the intended south pole touchdown site for the lander, which is called Vikram, as planned yesterday (Sept. 17), Aviation Week’s Mark Carreau reported. But “long shadows in the area may be obscuring the silent lunar explorer,” Carreau wrote.

“It was near dusk as the region prepares to transition from a two-week lunar day to an equally long lunar night, so shadows covered much of the region, and Vikram may not be in the LROC’s field of view,” Carreau wrote, citing a NASA statement.

This means that they will simply have to try again during a later orbit. Eventually the lighting conditions will be right, and LRO will photograph Vikram.

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LRO to image Vikram landing site next week

September 13, 2019 at 10:16 am Robert Zimmerman Points of Information

The Lunar Reconnaissance Orbiter (LRO) science team plans to take high resolution images of the Vikram landing site when the orbiter flies over that site on September 17, thus allowing them to release before and after images.

Noah Petro, LRO’s project scientist at NASA’s Goddard Space Flight Center, said that the orbiter is due to fly over the Vikram landing site Tuesday, Sept. 17. “Per NASA policy, all LRO data are publicly available,” Petro wrote in an email. “NASA will share any before and after flyover imagery of the area around the targeted Chandrayaan 2 Vikram lander landing site to support analysis by the Indian Space Research Organization.”

Officials with India’s space agency ISRO have said they have photographed Vikram with their orbiter, Chandrayaan-2, but they have not released these images as yet. Their have also been reports from India stating that their images suggest the lander is still in one piece, but these reports are not confirmed.

LRO’s images should clarify the situation. The images should also help tell us what exactly happened after Indian engineers lost contact with Vikram shortly before landing.

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Chandrayaan-2 locates Vikram

September 9, 2019 at 8:28 am Robert Zimmerman Points of Information

According to K. Sivan, the head of ISRO, India’s space agency, their Chandrayaan-2 orbiter has captured a thermal image of Vikram on the lunar surface, pinpointing the lander’s location.

They have not released the image. According to reports today, they do not yet know the lander’s condition, and have not regained communications. Reports late yesterday had quoted K.Sivan as saying “It must have been a hard-landing.” That quote is not in today’s reports.

In watching the landing and the subsequent reports out of India, it appears that India is having trouble dealing with this failure. To give the worst example, I watched a television anchor fantasize, twenty minutes after contact had been lost, that the lander must merely be hovering above the surface looking for a nice place to land. Most of the reports are not as bad, but all seem to want to minimize the failure, to an extreme extent.

Their grief is understandable, because their hopes were so high. At the same time, you can’t succeed in this kind of challenging endeavor without an uncompromising intellectual honesty, which means you admit failure as quickly as possible, look hard at the failure to figure out why it happened, and then fix the problem. If India can get to that place it will be a sign that they are maturing as a nation. At the moment it appears they are not quite there.

4 comments Chandrayaan-2, competition, engineering, government, India, ISRO, Moon, policy, politics, science, spaceflight, Vikram

Vikram fails to land on Moon

September 6, 2019 at 1:26 pm Robert Zimmerman Points of Information

Vikram, India’s first attempt to soft land on the Moon, apparently has failed, with something apparently going wrong in the very last seconds before landing.

As I write this they have not officially announced anything, but the live feed shows a room of very unhappy people.

It is possible the lander made it and has not yet sent back word, but such a confirmation should not take this long.

India’s prime minister, Narendra Modi, was given a very short briefing by K. Sivan, head of ISRO, and then apparently left without comment. This I found an interesting contrast to the actions of Israel’s prime minister Benjamin Netanyahu when its lunar lander Beresheet failed in landing earlier this year. Netanyahu came out to comfort the workers in mission control, congratulating them for getting as far as they had. ~~Modi apparently simply left.~~ UPDATE: Modi has reappeared to talk to the children who had won a contest to see the landing as well as people in mission control. After making a public statement he has now left.

They are now confirming that communications was lost at 2.1 kilometers altitude, which was just before landing. They are analyzing the data right now to figure out what went wrong.

11 comments Chandrayaan-2, competition, engineering, government, India, ISRO, Moon, policy, politics, spaceflight, Vikram

Watch Vikram landing on Moon

September 6, 2019 at 10:55 am Robert Zimmerman Points of Information

Vikram's primary landing site

The new colonial movement: I have embedded below the live stream of India’s attempt today to land its Vikram lander on the Moon, broadcast by one of their national television networks.

The landing window is from 4:30 to 5:30 pm Eastern. This live stream is set to begin about 3 pm Eastern.

If you want to watch ISRO’s official live stream you can access it here.

Some interesting details: Vikram is named after Vikram A. Sarabhai, who many consider the founder of India’s space program. The lunar rover that will roll off of Vikram once landing is achieved is dubbed Pragyan, which means “wisdom” in Sanskrit. Both are designed to operate on the Moon for one lunar day.

The landing site will be about 375 miles from the south pole.

That spot is a highland that rises between two craters dubbed Manzinus C and Simpelius N. On a grid of the moon’s surface, it would fall at 70.9 degrees south latitude and 22.7 degrees east longitude.

The white cross on the image to the right is where I think this site is. The secondary landing site is indicated by the red cross.

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Vikram makes second and last lunar orbital change

September 4, 2019 at 9:40 am Robert Zimmerman Points of Information

The new colonial movement: India’s Vikram lunar lander today made its second and last orbital change, preparing itself for landing on the Moon on September 7.

The orbit of Vikram Lander is 35 km x 101 km. Chandrayaan-2 Orbiter continues to orbit the Moon in an orbit of 96 km x 125 km and both the Orbiter and Lander are healthy.

With this maneuver the required orbit for the Vikram Lander to commence it descent towards the surface of the Moon is achieved. The Lander is scheduled to powered descent between 0100 – 0200 hrs IST on September 07, 2019, which is then followed by touch down of Lander between 0130 – 0230 hrs IST

They plan to roll the rover Pragyan off of Vikram about two hours after landing.

This article provides a nice overview of the mission.

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Vikram completes first de-orbit burn

September 2, 2019 at 9:45 pm Robert Zimmerman Points of Information

The new colonial movement: India’s Vikram lunar lander has successfully completed its first de-orbit engine burn, lasting 4 seconds, adjusting its orbit slightly in preparation for landing on the Moon on September 7.

They will do a second burn tomorrow, further adjusting the orbit.

Note that the update says that this burn was by Chandrayaan-2, but this must be a mistake. The Vikram lander separated from the Chandrayaan-2 orbiter yesterday, and it is Vikram that is doing the orbital changes and will land on the Moon.

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Vikram has successfully separated from Chandrayaan-2

September 2, 2019 at 9:11 am Robert Zimmerman Points of Information

The new colonial movement: India’s lunar lander, Vikram, has successfully separated from Chandrayaan-2, and is functioning nominally in lunar orbit.

The update describing this is the second update at the link, with the first detailing the arrangements for the press to cover the landing on September 7.

The lander carries the rover, dubbed Pragyan, which will roll off Vikram only a few hours after landing.

2 comments Chandrayaan-2, competition, engineering, India, ISRO, Moon, Pragyan, spaceflight, the new colonial movement, Vikram

Chandrayaan-2 now in proper lunar orbit for release of lander/rover

September 1, 2019 at 7:45 pm Robert Zimmerman Points of Information

India’s Chandrayaan-2 spacecraft today completed its fifth engine burn in lunar orbit, placing it in the correct orbit for releasing its lander/rover.

The next operation is the separation of Vikram Lander from Chandrayaan-2 Orbiter, which is scheduled on September 02, 2019, between 1245 – 1345 hrs (IST). Following this, there will be two deorbit maneuvers of Vikram Lander to prepare for its landing in the south polar region of the moon.

The landing itself is scheduled for September 7.

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Chandrayaan-2 lowers lunar orbit for the 4th time

August 30, 2019 at 8:56 am Robert Zimmerman Points of Information

The new colonial movement: India’s orbiter/lander/rover Chandrayaan-2 today successfully lowered its lunar orbit for the 4th time, dropping it to 77 by 102 miles.

The next engine burn is for tomorrow, and should be followed by almost daily burns from here on out, until they reach the required orbit for sending the lander/rover to the surface on September 7.

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Chandrayaan-2 lowers lunar orbit again

August 28, 2019 at 8:30 am Robert Zimmerman Points of Information

Chandrayaan-2 has successfully made its third lunar orbit engine burn, lowering its orbit to 179 x 1412 kilometers.

They are aiming for a 100 kilometer orbit. Once they reach that, the lander/rover will separate from the orbiter to begin its descent to the surface, on September 7.

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More images from Chandrayaan-2

August 26, 2019 at 9:13 am Robert Zimmerman Points of Information

Click for full image.

The Chandrayaan-2 engineering team has released more lunar images from Chandrayaan-2, this time from its higher resolution Terrain Mapping Camera 2.

One example is to the right, reduced to post here. It was taken from about 2,700 miles altitude, and shows a section of the northern hemisphere on the Moon’s heavily cratered far side. There are other images at the link.

The goal of these images is to demonstrate that the camera and spacecraft pointing systems are working. It appears they have done so successfully.

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ISRO releases Chandrayaan-2’s first Moon image from lunar orbit

August 22, 2019 at 9:22 am Robert Zimmerman Points of Information

The Moon as seen by Chandrayaan-2

India’s space agency ISRO has released the first image taken by Chandrayaan-2 after entering orbit around the Moon.

That image is to the right, reduced to post here. It was taken from about 1,600 miles elevation, and shows mostly the far side of the Moon. The dark mare in the upper right is the Sea of Moscow, which is the only large mare on the far side.

This image once again proves the camera and the spacecraft’s ability to point it accurately are both functioning.

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Chandrayaan-2 completes first lunar orbit adjustment

August 21, 2019 at 9:00 am Robert Zimmerman Points of Information

Chandrayaan-2 today made its first engine burn while in lunar orbit, reducing the orbit’s apolune (its high point) down to 4,412 kilometers from 18,072 kilometers.

Three more orbital adjustments to go before they enter the required orbit for landing.

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Chandrayaan-2 successfully enters lunar orbit

August 20, 2019 at 8:42 am Robert Zimmerman Points of Information

The head of ISRO today announced that, after completed a 29 minute engine burn, India’s Chandrayaan-2 orbiter/lander/rover has successfully entered the correct orbit around the Moon.

In his briefing, Dr. Sivan announced that “The LOI maneuver was performed successfully today morning using the onboard propulsion system for a firing duration of about 29 minutes. This maneuver precisely injected Chandrayaan-2 into an orbit around the Moon.” He emphasised the unique requirement of 90 degree orbital inclination of Chandrayaan-2 and said that it was achieved by the precise execution of both the Trans Lunar Injection (performed on August 14, 2019) and today’s LOI maneuver.

“The satellite is currently located in a lunar orbit with a distance of about 114 km at perilune (nearest point to the Moon) and 18,072 km at apolune (farthest point to the Moon)”, he added.

Over the next four lunar orbits they will execute four more engine burns to lower the spacecraft to the orbit needed to send the lander/rover to the surface on September 7 in the south polar region of the Moon between the craters Manzinus C and Simpelius N at about 71 degrees latitude.

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Chandrayaan-2 successfully puts itself in route to the Moon

August 14, 2019 at 8:46 am Robert Zimmerman Points of Information

Chandrayaan-2 today successfully completed its last Earth perigee burn, raising its orbital apogee so that it will enter the Moon’s gravitational sphere of influence on August 20th.

Chandrayaan-2 will approach Moon on August 20, 2019 and the spacecraft’s liquid engine will be fired again to insert the spacecraft into a lunar orbit. Following this, there will be further four orbit maneuvers to make the spacecraft enter into its final orbit passing over the lunar poles at a distance of about 100 km from the Moon’s surface.

…Subsequently, Vikram lander will separate from the orbiter on September 02, 2019. Two orbit maneuvers will be performed on the lander before the initiation of powered descent to make a soft landing on the lunar surface on September 07, 2019.

Vikram will be doing the hardest part, the landing.

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India’s new smallsat rocket gets its first launch contract

August 7, 2019 at 10:48 am Robert Zimmerman Points of Information

The new colonial movement: India today signed its first customer for its new and still untested SSLV rocket, designed to provide orbital launch services for the burgeoning smallsat market.

Spaceflight announced Aug. 6 that it will purchase the first commercial launch a new Indian vehicle scheduled to make its debut later this year. Spaceflight said it will launch payloads for an undisclosed U.S. satellite constellation customer on a flight of the Small Satellite Launch Vehicle (SSLV), a derivative of the existing, larger Polar Satellite Launch Vehicle (PSLV). The launch is scheduled for later this year and will be the second for the SSLV after a demonstration launch expected no earlier than September.

While the companies didn’t announce the customer for the mission, a July 25 filing with the Federal Communications Commission by Earth imaging company BlackSky Global sought a license for four of its satellites it said would launch on the SSLV in November 2019. The applications said the satellites would be deployed into two orbital planes, consistent with Spaceflight’s announcement.

While this Indian rocket is hardly a private operation, it has no military component, as do the new Chinese smallsat companies. ISRO, India’s space agency, is wholly civilian with no apparent ties to its military, as far as I know. Its goal is to purely make money and grab market share.

At the same time, the use of government funds to develop this rocket gives India the same advantage that China’s smallsat companies have over the privately funded rockets from the U.S. It allows them to set lower prices and undercut the competition.

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Chandrayaan-2 completes fifth orbital maneuver

August 7, 2019 at 10:40 am Robert Zimmerman Points of Information

Chandrayaan-2 has completed its fifth engine burn, raising the apogee of its Earth orbit to 142,975 kilometers.

The next engine burn, on August 14, will raise that apogee enough for the spacecraft to enter the Moon’s gravitational sphere of influence, when they will then transfer into lunar orbit.

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First images from Chandrayaan-2

August 5, 2019 at 8:29 am Robert Zimmerman Points of Information

Earth from Chandrayaan-2

India yesterday released the first images taken by its lunar orbiter/lander/rover Chandrayaan-2, taken from Earth orbit of the Earth.

The image on the right is one example, and was taken mostly for engineering purposes. All the images (available here) demonstrates that the spacecraft’s camera is working properly, and it can orient itself accurately.

They now hope to put the spacecraft into lunar orbit on August 20th, with the landing attempt set for September 7th, after they have lowered that lunar orbit sufficiently.

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Chandrayaan-2 successfully completes 4th orbit burn

August 2, 2019 at 9:23 am Robert Zimmerman Points of Information

The new colonial movement: India’s lunar orbiter/lander/rover Chandrayaan-2 today successfully completed its fourth engine burn, this time raising its orbital apogee to 89,472 kilometers (55,595 miles).

The next burn is scheduled for August 6, when the spacecraft’s orbit brings it back down to its perigee.

By September they expect to raise that apogee high enough so that it is within the Moon’s gravitational sphere of influence, when they will be able to put it the spacecraft into lunar orbit.

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Chandrayaan-2 completes third orbit maneuver

July 30, 2019 at 9:14 am Robert Zimmerman Points of Information

Chandrayaan-2 has completed its third engine burn to raise the apogee of its orbit to 71K.

The next burn is set for August 2, when the spacecraft returns to its orbital low point, the perigee. As it raises its orbit each time the time between burns gets extended because the orbit gets longer. By September however the apogee will put the spacecraft in the Moon’s gravitational field of influence, and when Chandrayaan-2 reaches that apogee engineers will then fire its engines again to slow it down and enter lunar orbit.

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