ART ASTRONOMY Sun, Moon, Venus & Miscellaneous PROCESSING
TUTES |
MARS 2020 |
Note: Some
of the images on this page are "clickable" and will open up as
"full scale images" in a new tab. |
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Mars
Compendium |
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The image
above represents a compendium of seven of the best colour images from the
2020 Mars apparition. In 2020
Mars only rose to about 48 degrees from where we lived, with the highest
elevation of this planet only 2 degrees higher when we travelled further
North at times. Not only
this, the weather was very poor for much of the time in 2020 so to complete a
set of images of this resolution/detail was very satisfying – looking at them
from the lower left upwards you will see that they represent Mars rotating to
display all the different vistas. Remember
to click on the image above to see them at the maximum scale of your viewing
screen - & again when the larger image page opens! |
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The image
above was the final “puzzle-piece” in our quest to capture all the different
views of Mars one can see on its’ globe. We were
very lucky as by the time we captured this view, Mars was beginning to
rapidly shrink in apparent size as it moved further away from Earth, so along
with the continuingly unhelpful weather it was a lucky scoop. The dark
feature face-on in this image (which resembles Africa) is Syrtis Major -
& above this is the enormous (both in area & depth) impact crater
Hellas with a lot of detail within it. Remember
to click the image above! 😊 |
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Mars
Compendium |
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Before we
captured the image with Syrtis Major front & centre we had captured the 6
sets of images above. Each of
these 6 sets shows the combined rgb image at the top of each column & the
individual red, green & blue filters that make up the rgb below them. |
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Mars Dusty
Comparisons |
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After we
had captured the 7 images displaying all the “faces” of Mars the weather
became so bad that it was very difficult to capture anything at all – as well
as Mars appearing smaller as it got further & further away from planet
Earth. But as
this was happenning a very large dust storm also commenced on Mars, spreading
across a large section of the planet. The dust can be seen as the lighter
colours obscuring much of the darker markings on Mars in these images, with
the first image (left) showing how the enormous canyon-system of Valles
Marineris became filled with dust! |
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Antoniadi
Crater |
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One of the
ways that amateur astronomers can verify details they pick up is to measure
the position of them in their images using WinJUPOS software. Due to changes
in the angle that Mars is viewed, where at different times more of the
Northern or Southern hemispheres are visible…plus the altering of the
features themselves due mainly to shifts in lighter material (dust, sand etc)
changing the appearance of darker landmarks…identifying various features can
be difficult - if they accord with the official latitudes & longitudes of
any feature then they may be verified as such in amateur images: the above
image is an example of this exercise. |
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25th
November 2020 |
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The image
above as well as the one below & the animated mono (black & white)
image below are the same as those 3 grouped together further up displaying
the huge dust storm that erupted late in the 2020 apparition. |
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16th
November 2020 |
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The above
ir image displaying the late-season dust storm as a 2-image/frame animation,
shows how the dust settling in Valles Marineris picks out this enormous
canyon system very vividly – it is that vein-like network in lighter/brighter
tones near the centre of the disk. |
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7th
Novembe 2020 |
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One of the
images later in the apparition taken with the ASI462MC colour camera. On some
nights we used both the mono & colour cameras alternatively & the
same view of Mars might’ve been captured on more than one occasion, as this
was. Because a slightly different view of Mars is presented every night, the
feat mentioned before of capturing those 7 different vistas meant there were
numerous times when the same view was shown – meaning we selected the ones
that we felt were the “best” of each vista. |
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October 25th
2020 |
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Above we see a 3-frame animation of a Mars blue
filter image/capture – the blue filter does not usually reveal the dark
markings with the same contrast as the red or green filters but is much
better at displaying the clouds in the Martian atmosphere. |
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Red Channel |
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Like the
blue channel above this one, here is a red filter animation where you can see
that the dark markings on Mars are much more contrasted than the blue filter
animation. |
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18th
October2020 |
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The image
above & the next 6 are one of the reasons why we made it a quest to
capture all the different vistas of Mars in high resolution during the 2020
apparition. We show 7
vistas of Mars in the first compound image at the top of this page & they
all overlap to certain extent (part of our “quest” also) so we used these 7
images to create annotated maps covering all of Mars. We felt
this was an advantage in certain ways over many on the internet so that
fellow amateurs could identify numerous Martian features by displaying images
similar to their own. These
“annotated maps” (along with the individual filter images) can all be clicked
on to see them at the scale intended..! |
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13th
October 2020 |
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10th
October 2020 |
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9th
October 2020 |
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25th
September 2020 |
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13th
September 2020 Annotated
Mars |
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9th
September 2020 |
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The colour
ASI462MC camera is very good at capturing infra-red images also with the appropriate
filters – above we see one such image as well as a “normal” colour image from
it. |
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4th
September 2020 |
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As
mentioned, on numerous nights we used both the colour & mono cameras: the
above compares images from both cameras taken roughly one hour apart on the
same night – we usually prefer to use the mono camera (on the left here) but they are very similar & some
might prefer the colour camera’s image in this instance! (on the right) 😊 |
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An
infra-red image using an ir610nm filter & the mono camera ASI290MM. |
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Another
r-g-b image from the mono camera showing “The Eye of Mars” – see annotated
map images further up. |
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The green
filter image from the r-g-b mono camera image above that, with the red filter
image below |
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More
images (above & below) from the same night, but earlier… |
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7th
July 2020 |
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The image
above (rgb colour) & the 3 individual filter images below (mono, black
& white) were taken on July 7th 2020 when Mars was coming
nearer to Earth but still distant & much less than its apparent size at
opposition. At
opposition (October 13th in 2020) Mars was 22.4 arc-seconds in
diameter viewed from Earth (written as 22.4”) but in these images it was only
about half that apparent diameter (12.0”) which means its actual apparent
size was just a bit more than ¼ the size that the disk appeared at
opposition! Sinus
Meridiani on the right & Syrtis Major on the left are in view, but
perhaps the most notable aspect of Mars here is the size of the South Polar
Cap (SPC).– if you compare it to images further up the page you will see that
as the year progresses this SPC shrinks as the Southern Hemisphere begins to
warm up & the water-ice melts, while the solid carbon dioxide (dry ice)
sublimates (turns to gas) into the Martian atmosphere. |
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4th
June 2020 |
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Going back
earlier into the year this image of Mars was with an apparent diameter of
9.5” – you can see Syrtis Major on view & the SPC (South Polar Cap) is
larger than the that in the images above this one. A single
frame from each of the red, green & blue filter videos as well as the
stacks from each of the r, g & b captures are included. |
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28th
May 2020 |
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A bit
earlier in the year & apparition again slightly smaller still! Sinus
Meridiani is the main feature displayed in this image. |
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16th
May 2020 |
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Smaller
& earlier again! 😊 A small
(relatively) white cloud can be seen near the centre of the planet, with a
large cap of ice on the SPC. |
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The blue
filter images in a little animation – remembering that the blue filter is
best at revealing clouds on Mars usually. |
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4th
May 2020 |
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At 7.8”
Mars is getting really small this early in the apparition – at about 1/3 the
size of when it was at opposition later in 2020, this image only covers about
1/9 the size on October 13th 2020! Mare
Cimmerium is on display here. |
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21st
April 2020 |
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7.2” here
with S. Meridiani front & centre. |
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8th
April 2020 |
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6.7
arc-seconds in diameter here. |
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1st
April 2020 |
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6.4” on
this date. |
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18th
March 2020 |
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6.0” with Syrtis Major dominating the
view here. |
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17th March 2020 |
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22nd February 2020 |
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8th February 2020 |
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5.0 arc-seconds here! |
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28th January 2020 |
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The above snippet from the capture video
we took shows how Mars appeared onscreen before we processed it for the final
image below – a tribute to the processing softwares
we employed..! 😊 |
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The little
animation above & the 2 images
below when Mars was only 4.7” in apparent diameter. Our
earliest images of Mars for 2020 – the apparent diameter here was just over
1/5 the size at opposition which means (because the area of a disk is the
radius of it squared) that Mars was about 23 or 24 times the size of this
image at opposition – which explains why it is much easier to get good,
detailed images around opposition..! |
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