Smallest satellite yet detects exoplanet
The smallest satellite yet, a cubesat, has demonstrated the potential of cubesats to do real cutting edge astronomy by successfully detected a known exoplanet.
Long before it was deployed into low-Earth orbit from the International Space Station in Nov. 2017, the tiny ASTERIA spacecraft had a big goal: to prove that a satellite roughly the size of a briefcase could perform some of the complex tasks much larger space observatories use to study exoplanets, or planets outside our solar system. A new paper soon to be published in the Astronomical Journal describes how ASTERIA (short for Arcsecond Space Telescope Enabling Research in Astrophysics) didn’t just demonstrate it could perform those tasks but went above and beyond, detecting the known exoplanet 55 Cancri e.
Scorching hot and about twice the size of Earth, 55 Cancri e orbits extremely close to its Sun-like parent star. Scientists already knew the planet’s location; looking for it was a way to test ASTERIA’s capabilities. The tiny spacecraft wasn’t initially designed to perform science; rather, as a technology demonstration, the mission’s goal was to develop new capabilities for future missions. The team’s technological leap was to build a small spacecraft that could conduct fine pointing control – essentially the ability to stay very steadily focused on an object for long periods.
…The CubeSat used fine pointing control to detect 55 Cancri e via the transit method, in which scientists look for dips in the brightness of a star caused by a passing planet. When making exoplanet detections this way, a spacecraft’s own movements or vibrations can produce jiggles in the data that could be misinterpreted as changes in the star’s brightness. The spacecraft needs to stay steady and keep the star centered in its field of view. This allows scientists to accurately measure the star’s brightness and identify the tiny changes that indicate the planet has passed in front of it, blocking some of its light.
This success is mostly a proof of concept, but it lays the groundwork for less expensive future space astronomy, using low cost cubesats capable of doing what the expensive orbiting space telescopes have done so far.
The support of my readers through the years has given me the freedom and ability to analyze objectively the ongoing renaissance in space, as well as the cultural changes -- for good or ill -- that are happening across America. Four years ago, just before the 2020 election I wrote that Joe Biden's mental health was suspect. Only in this year has the propaganda mainstream media decided to recognize that basic fact.
Fourteen years ago I wrote that SLS and Orion were a bad ideas, a waste of money, would be years behind schedule, and better replaced by commercial private enterprise. Even today NASA and Congress refuse to recognize this reality.
In 2020 when the world panicked over COVID I wrote that the panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Only in the past year have some of our so-called experts in the health field have begun to recognize these facts.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
Please consider supporting my work here at Behind the Black.
You can support me either by giving a one-time contribution or a regular subscription. There are five ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation:
5. Donate by check, payable to Robert Zimmerman and mailed to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above. And if you buy the books through the ebookit links, I get a larger cut and I get it sooner.
The smallest satellite yet, a cubesat, has demonstrated the potential of cubesats to do real cutting edge astronomy by successfully detected a known exoplanet.
Long before it was deployed into low-Earth orbit from the International Space Station in Nov. 2017, the tiny ASTERIA spacecraft had a big goal: to prove that a satellite roughly the size of a briefcase could perform some of the complex tasks much larger space observatories use to study exoplanets, or planets outside our solar system. A new paper soon to be published in the Astronomical Journal describes how ASTERIA (short for Arcsecond Space Telescope Enabling Research in Astrophysics) didn’t just demonstrate it could perform those tasks but went above and beyond, detecting the known exoplanet 55 Cancri e.
Scorching hot and about twice the size of Earth, 55 Cancri e orbits extremely close to its Sun-like parent star. Scientists already knew the planet’s location; looking for it was a way to test ASTERIA’s capabilities. The tiny spacecraft wasn’t initially designed to perform science; rather, as a technology demonstration, the mission’s goal was to develop new capabilities for future missions. The team’s technological leap was to build a small spacecraft that could conduct fine pointing control – essentially the ability to stay very steadily focused on an object for long periods.
…The CubeSat used fine pointing control to detect 55 Cancri e via the transit method, in which scientists look for dips in the brightness of a star caused by a passing planet. When making exoplanet detections this way, a spacecraft’s own movements or vibrations can produce jiggles in the data that could be misinterpreted as changes in the star’s brightness. The spacecraft needs to stay steady and keep the star centered in its field of view. This allows scientists to accurately measure the star’s brightness and identify the tiny changes that indicate the planet has passed in front of it, blocking some of its light.
This success is mostly a proof of concept, but it lays the groundwork for less expensive future space astronomy, using low cost cubesats capable of doing what the expensive orbiting space telescopes have done so far.
The support of my readers through the years has given me the freedom and ability to analyze objectively the ongoing renaissance in space, as well as the cultural changes -- for good or ill -- that are happening across America. Four years ago, just before the 2020 election I wrote that Joe Biden's mental health was suspect. Only in this year has the propaganda mainstream media decided to recognize that basic fact.
Fourteen years ago I wrote that SLS and Orion were a bad ideas, a waste of money, would be years behind schedule, and better replaced by commercial private enterprise. Even today NASA and Congress refuse to recognize this reality.
In 2020 when the world panicked over COVID I wrote that the panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Only in the past year have some of our so-called experts in the health field have begun to recognize these facts.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
Please consider supporting my work here at Behind the Black.
You can support me either by giving a one-time contribution or a regular subscription. There are five ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation:
5. Donate by check, payable to Robert Zimmerman and mailed to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above. And if you buy the books through the ebookit links, I get a larger cut and I get it sooner.
The full Moon’s diameter is half a degree. That is 30 arc minutes and 1800 arc seconds. A mirror that focuses on a single star, which are point sources without resolution, doesn’t need to be very large. The trick is the stability of the satellite, which is nudged by the Moon and the upper atmosphere and whatnot, and the precision of the photon detector. That this now can be done with a cubesat is great news! One could dedicate a cubesat for every star of interest. Just watching the activity of Sun like stars in the neighborhood might give interesting insights. Perhaps giving cause for a motivated panic for once.