Skip to main content
11 votes

Why did MRO have to "both pitch upward and roll hard to the left" to point exactly at Perseverance during the entry, descent and landing phase?

A year plus later and with the enormous benefit of reconstructed data (SPICE kernels), the exact maneuvers of the spacecraft can be visualized. The PDS Label for the MRO data product gives the ...
BrendanLuke15's user avatar
9 votes

Is the "Mars blue dune" actually blue? And what makes it so?

It is actually surprisingly difficult to determine the color of something so small on Mars. In order to best understand that, we need to understand a bit more about HiRISE, and more about human vision....
PearsonArtPhoto's user avatar
  • 121k
9 votes
Accepted

Why did MRO have to "both pitch upward and roll hard to the left" to point exactly at Perseverance during the entry, descent and landing phase?

Why exactly did MRO have to "both pitch upward and roll hard to the left" to point exactly at Perseverance during the entry, descent and landing phase? Perseverance was not directly ...
David Hammen's user avatar
  • 74.9k
8 votes
Accepted

Mirror size and pixel resolution on planetary surfaces

The question does not make optical sense (as currently asked) and does not have a numerical answer. Aperture size affects the diffraction limit, but pixel size is an independent choice, and you need ...
uhoh's user avatar
  • 149k
8 votes

What is the size of the HiRISE footprints?

HiRISE uses "pushbroom" imaging so the length of the footprint is variable depending on the length of "Time Delay and Integration" (TDI) used in a given observation. However, the ...
BrendanLuke15's user avatar
7 votes
Accepted

Why aren't there HiRISE observation footprints near the Martian poles?

HiRise routinely observes at high latitudes. In fact I can quickly find these examples: At $86.8^\circ$: https://hirise.lpl.arizona.edu/ESP_035295_2670 At $82.2^\circ$: https://www.uahirise.org/...
Swike's user avatar
  • 2,501
5 votes

Is the "Mars blue dune" actually blue? And what makes it so?

Part 1, "is it actually blue?" This is a HiRISE image. On the page linked to by your source page, there is a heading 'About color products (PDF)'. This is the one you're looking for: ...
Hobbes's user avatar
  • 128k
5 votes
Accepted

What are these Martian space-whale (or seagull) shaped features?

Taking the current location of the Zhurong rover, 25.1° N and 109.7° E, as a guide to location of the region in question the Mars Global Surveyor took this photograph in 2004, It shows "whale&...
Fred's user avatar
  • 13.1k
4 votes

Is the "Mars blue dune" actually blue? And what makes it so?

Excerpt from Information for Scientific Users of HiRISE Color Products by Alfred McEwen and Eric Eliason, October 10, 2007: What do the colors in HiRISE images mean? The PDS products are stretched ...
Robert's user avatar
  • 41
4 votes

Is the "Mars blue dune" actually blue? And what makes it so?

Picking up on PearsonArtPhoto great answer, I was intrigued by the assertion that what we saw in the image was mostly blue with almost no red channel. So I wrote the following snippet of code, to ...
BlueCoder's user avatar
  • 2,113
3 votes
Accepted

Can HiRISE see Perseverance?

Here's HiRISE's picture of Perseverance and EDL hardware on the ground: (Source, Unannotated higher-res original)
JohannesD's user avatar
  • 291
3 votes

Is the "Mars blue dune" actually blue? And what makes it so?

Is the “Mars blue dune” actually blue? No, “The dunes are actually grey, but appear relatively blue after such a stretch because most of Mars is red.” (see below). The false color generation is used ...
uhoh's user avatar
  • 149k
2 votes

What was the effective magnification of the Mars Reconnaissance Orbiter's HiRISE camera to acquire the detailed image of Earth?

PIA10244: Earth and Moon as Seen from Mars article you link to links to the JPL image catalog page PIA10244: Earth and Moon as Seen from Mars which says: The High Resolution Imaging Science ...
uhoh's user avatar
  • 149k
2 votes

Is the "Mars blue dune" actually blue? And what makes it so?

The referenced site states: Just to the south of the group of barchan dunes is one large dune with a more complex structure. This particular dune, appearing like turquoise blue in enhanced color, ...
David Ratti's user avatar
  • 1,438
2 votes

How to use this Google Mars viewer to find this Martian landslide event?

The image below is from the The crater itself is only 5 meters across link on the HiRISE page ESP_054066_1920. NASA/JPL/University of Arizona This answer from @BlueCoder shows this image viewer ...
Cornelis's user avatar
  • 7,535
2 votes
Accepted

How to use this Google Mars viewer to find this Martian landslide event?

Q: It shows a red box, so I'm wondering if that's the event The HiRise page gives some information about the image: Latitude (centered) 11.797°, Longitude (East) 14.763° If you use https://...
BlueCoder's user avatar
  • 2,113

Only top scored, non community-wiki answers of a minimum length are eligible