InSight detects and dates large impact on Mars
Click for full image.
Using the data from InSight’s seismometer of a 4 magnitude earthquake on Mars on December 24, 2021, scientists were able to use the high resolution camera on Mars Reconnaissance Orbiter (MRO) to find the meteorite impact that produced that quake, the largest detected since spacecraft have been visiting Mars. The picture to the right, cropped and reduced to post here and unveiled at yesterday’s press conference, shows the new crater.
The meteoroid is estimated to have spanned 16 to 39 feet (5 to 12 meters) – small enough that it would have burned up in Earth’s atmosphere, but not in Mars’ thin atmosphere, which is just 1% as dense as our planet’s. The impact, in a region called Amazonis Planitia, blasted a crater roughly 492 feet (150 meters) across and 70 feet (21 meters) deep. Some of the ejecta thrown by the impact flew as far as 23 miles (37 kilometers) away.
With images and seismic data documenting the event, this is believed to be one of the largest craters ever witnessed forming any place in the solar system.
This is not the first such impact identified from InSight seismic data, but it is the largest. The white streaks surrounding the crater are thought to be near-surface ice ejected at impact.
The overview map below provides further context, as well as showing us the proximity of this impact to the proposed Starship landing sites on Mars.
The black cross marks the impact location. The four red spots are the prime Starship landing sites. The white dots indicate other locations considered. The black dots were images taken for a proposed Dragon landing. This impact is thus only about 100 miles away from the nearest possible Starship landing spot.
The data has consistently suggested that this region of Mars has a lot of near surface ice. As Donna Viola of the University of Arizona noted at a science conference, “I think you could dig anywhere to get your water ice.” This impact did that digging, and thus threw out some ice.
The press conference also unveiled another impact discovered by InSight, located in the cracked region called Tempe Terra, east of the large shield volcano Alba Mons. Though the impact exposed bright material, “it is not clear whether this crater exposed ice from the subsurface.”
Meanwhile, InSight’s future remains dim. Scientists said at the conference that they now expect its mission to end within the next six weeks, when its power level drops too low for the lander to function.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Click for full image.
Using the data from InSight’s seismometer of a 4 magnitude earthquake on Mars on December 24, 2021, scientists were able to use the high resolution camera on Mars Reconnaissance Orbiter (MRO) to find the meteorite impact that produced that quake, the largest detected since spacecraft have been visiting Mars. The picture to the right, cropped and reduced to post here and unveiled at yesterday’s press conference, shows the new crater.
The meteoroid is estimated to have spanned 16 to 39 feet (5 to 12 meters) – small enough that it would have burned up in Earth’s atmosphere, but not in Mars’ thin atmosphere, which is just 1% as dense as our planet’s. The impact, in a region called Amazonis Planitia, blasted a crater roughly 492 feet (150 meters) across and 70 feet (21 meters) deep. Some of the ejecta thrown by the impact flew as far as 23 miles (37 kilometers) away.
With images and seismic data documenting the event, this is believed to be one of the largest craters ever witnessed forming any place in the solar system.
This is not the first such impact identified from InSight seismic data, but it is the largest. The white streaks surrounding the crater are thought to be near-surface ice ejected at impact.
The overview map below provides further context, as well as showing us the proximity of this impact to the proposed Starship landing sites on Mars.
The black cross marks the impact location. The four red spots are the prime Starship landing sites. The white dots indicate other locations considered. The black dots were images taken for a proposed Dragon landing. This impact is thus only about 100 miles away from the nearest possible Starship landing spot.
The data has consistently suggested that this region of Mars has a lot of near surface ice. As Donna Viola of the University of Arizona noted at a science conference, “I think you could dig anywhere to get your water ice.” This impact did that digging, and thus threw out some ice.
The press conference also unveiled another impact discovered by InSight, located in the cracked region called Tempe Terra, east of the large shield volcano Alba Mons. Though the impact exposed bright material, “it is not clear whether this crater exposed ice from the subsurface.”
Meanwhile, InSight’s future remains dim. Scientists said at the conference that they now expect its mission to end within the next six weeks, when its power level drops too low for the lander to function.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
It seems to me that Insight has generated great science that would justify all future mission should include a basic seismometers with its own solar array to be deposited to develop a more extensive seismic record. Just mount them under next gen rovers along with their helicopter scouts to be deployed as part of mission commissioning after landing.
Since it was going to be dust covered anyway—I wonder what it would detect had this hit instead:
https://en.m.wikipedia.org/wiki/C/2013_A1_(Siding_Spring)
https://www.usatoday.com/story/news/nation/2014/10/16/mars-comet-near-miss-planet-collide/17370459/