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Object Mars
Image type image
File size 485.0 KB
URL mars2020-08-05_18-43-36_R_nmacneill.png
Observer Niall MacNeill
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Comments: Red filter image. On the terminator, pretty much at the equator, is Sinus Meridiani and considerable detail of the area around the Schiaparelli crater can be observed. To its south the albedo area of Noachis Terra seems to have a generous covering of light brown dust and whether it is airborne or settled on the ground is unclear. On the f side of the Central Meridian is the large albedo area of Mare Erythraeum and to its south the lighter coloured circular area is Argyre Planitia. Its dark periphery is visible if somewhat obscured. The Vallis Marineris is right on the limb rotating into view. However, once again its canyons can be traced through the Aurorae Sinus by the lighter coloured dust pooling there. The region around the Oxia Palus seems to have changed shape considerably and the distinctive albedo finger extending to the north can barely be discerned. In fact, an albedo bridge seems to have developed from the northerly Niliacus Lacus and now joins the Oxia Palus, such that there is no lighter coloured area separating the albedo areas north and south. Nilokeras can be seen to the north at the limb and on its p side Mare Acidalium, north of Niliacus Lacus has a thick layer of blue white cloud, as it did the day before. Novus Mons is on one side of the SPC near the terminator and has an interesting "U" shape. Perhaps most interesting of all is the evidence of rapid Carbon Dioxide gas sublimation/ evolution on the edge of the SPC on the f side of the CM. This phenomenon is referred to as "cascades" in some reports. The rapid sublimation drives winds off the edge of the polar cap stirring up dust. There is strong evidence of this dust streaming away from the SPC.

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Observation 1
Feature(s) Vallis Marineris
Argyre Planitia
Mare Erythraeum
Aurorae Sinus
Nilokeras
Margaritifer Sinus
Oxia Palus
Niliacus Lacus
Filter(s) R
Date 2020-08-05 18:43:36
Julian day 2459067.279861111
System I 90.1°
System II N/A
System III N/A
Illumination 86.9%
Phase angle 42.5°
Solar longitude 108.0°
Eq. diameter 15.07″
Derotation 12.0 min