More mars: northern polar hood, bonus jupiter

 After imaging the mars occultation (which occurred at low altitude), I waited a few hours for mars to reach maximum elevation and increased the magnification.

A layer of clouds, referred to as the northern polar hood, covers the north pole in these images.  Surface structure is more evident in the IR images which cut through cloud cover. 

Mars 12/8/22  07:26.1 UTC

probably snowing on the north pole.  

also got some bonus time on jupiter:

Jupiter 2022-12-08 04:36.3 UTC

Jupiter 2022-12-08 04:29.9-04:42.6 UTC

Image details:

average seeing

Mars 12/8/22  07:26.1 UTC

Jupiter 12/8/2204:29.9-04:42.6

eastbluff, CA

celestron 11" Edge HD

ZWO ASI 290MC (one shot color camera)

2x powermate

baader IR/UV block filter

ZWO IR pass 850 nm for IR images

Jupiter 

Image reduced by 50% due to poor seeing

10x90 sec

FPS (avg.)=42

Shutter=2.581ms

Gain=351 (58%)

Histogramm=41%

Mars

RGB 6x120 sec

FPS (avg.)=145

Shutter=1.000ms

Gain=351 (58%)

Histogramm=46%

IR 2x120 sec

FPS (avg.)=147

Shutter=5.000ms

Gain=351 (58%)

Histogramm=33%

mars eclipse (occultation) 12/7/22 aka 12/8/22 ~02:27 UTC

 On December 7th, both mars and the moon were in opposition--directly opposite the earth.  for the moon that means a full moon.  for mars it means the planet is roughly closest to the earth in it's orbit, so visually much larger and brighter than other times during the year.  since the planets in our solar system generally orbit in the same plane...the moon "eclipsed" (occulted) mars this year at opposition--an excellent photo opportunity.  

Mars emerging from lunar occultation
12/8/22 ~03:34 UTC
stacked composite

A different perspective:

Mars has risen
occultation egress
stacked composite

Same image, full scale crop:

occultation egress
stacked composite
full scale crop

Occultation start, 4x speed:

I used sky safari, to preview the location of mars at egress then, eyeballing the craters, navigated my narrow high power field to where I thought mars would appear.  Miraculously it appeared dead center in the field.  

Occultation end 4x speed:

Kudo's to the sky safari app

Imaging commentary:

The occultation occurred with the moon rising low in the east (6:30 PM local), so I had to move from my usual imaging location.  Unable to set up the night before, I had to bolt from work like Fred Flintstone at the whistle and set up from scratch.  polar aligned sighting thru the saddle at polaris, then 1 object align on mars.  did not have time to tune the ADC. Whatever settings I had last time were probably better than nothing.  

Used a lower gain and max histogram to improve the dynamic range.  

Processing was a bear.  Stacking software (autostakkert) could not handle my occasional field adjustments, so I wound up having to edit the video into smaller clips with PIPP, virtual dub, and photoshop, then process separately.  

The first two images are composites combining a stacked mars image, a stacked moon image, and a single frame.  

Image details:

12/8/22  ~02:27-03:34 UTC

eastbluff, CA

celestron 11" Edge HD

ZWO ASI 290MC (one shot color camera)

ZWO ADC

baader IR/UV block filter

12 fps, 1.844 ms, 152 gain, 100% histogram

isolated mars after egress

56 fps .924 ms, 251 gain (only 41%, should have been higher)

This was my second time using the celestron CGX which has some nice ergonomic features for rapid set up

Mars is here, 11/26/22. filter tricks--IR filter with RGB camera

 Mars is here.

The seeing wasn't great this session, so i imaged without a barlow.  I wanted to test out an infrared filter with a color camera which worked perfectly (see details below).

Mars 11/26/22 8:51 UTC
RGB left, IR 850 pass center, IR-RGB composite right

as i was breaking down the gear, i noticed that the stars were no longer twinkling ;) 
broke out the barlow and got less sleep than planned:

Mars 11/26/22 9:26 UTC
single 120 sec capture

Why an infrared (IR) filter works with a color camera:

the color filters in many color cameras pass infrared light.

(which is why you should use an IR blocking filter)

The ZWO 290 MC passes the IR from an 850 nm IR pass filter equally through all color filters.

as a result, you can get a uniform full resolution monochrome IR image when using an IR filter with a color camera.  

just be sure to set the color balance for all filters to neutral (see below).  

Image details:
11/26/22  08:34-09:26 UTC
celestron 11" Edge HD

first set
ZWO ASI 290MC (one shot color camera)
baader IR/UV block filter for RGB images
400 fps, .191 ms, 351 gain, 40% histogram, 120 sec x 4
ZWO IR pass 850 nm for IR images
set green and blue gain to .5 in fire capture for IR
400 fps, .855 ms, 351 gain, 35% histogram, 120 sec x 3

second image
ZWO ASI 290MC (one shot color camera)
baader IR/UV block filter
televue 2x barlow
152 fps, 2.132 ms, gain 291?, histogram 49%, 120 sec
single 120 sec capture

firecapture, autostakkert 5% stacked, winjupos, maxim, photoshop
elevation ~80 degrees
Eastbluff
Southern California

for IR-RGB blend IR was used as red channel and 30% luminance, color rebalanced on white pole structure.  

ref:

IR filter with ZWO camera

https://astronomy-imaging-camera.com/product/1-25-ir-850nm-pass-filter

"just don’t forget to keep the WB_R and WB_B to 50 (no White Balance applied)."

fire capture screen shots:

click for full size

click for full size

another try at mercury

detail on mercury is still on my wish list.  unfortunately, the goto on my failing mount is not up to mid day imaging.  so i gave it a shot as it set near the horizon.  seeing was pretty bad at low altitude.  a low pass IR filter pulled out the planet, but no evidence of detail. 

Mercury 5/4/22 02:56 UTC

processing notes:

for reasons which escape me, my stacking software (autostakkert) was completely unable to distinguish bright, but totally distorted frames (which were the majority) from a well defined crescent.  as i result i had to manually select approximately 200 frames out of 8,651.  a process made even more tedious by a windows update blowing all my work about half way done.  needless to say, this one sat on the hard drive for a while.  finally made it thru all the frames, but alas, didn't get anything more than a crescent, no detail.  to be expected i guess with such poor seeing.  

prior attempts

image details:

camera ZWO ASI 290mm IR pass filter 850
celestron 11" Edge HD, no barlow
8651 frames @75 fps 6.085 ms gain 351

upsampled ~2x
5/4/22 02:56 UTC (5/3/22 ~8 pm local)
East Bluff, CA
poor seeing, IR filter helped

more craters: petavius and langrenus

cruising along the 3 day old crescent moon from mare crisium leads to this pair of craters with prominent central peaks and terraced walls:

craters patavius and langrenus
3 day old moon 5/4/22 03:04 UTC

to the left is Patavius, notable for a 
-wide double rim
-complex central mountains 1.7 km from the floor and a 
-deep fracture from the peaks to the rim of the crater. 

Patavius

views of petavius are reportedly very sensitive to contrast:  

"The shadows retreat with surprising speed and for the rest of the lunation, until just after full Moon, Petavius is identifiable as a white oval. Its grandeur then reappears briefly before the whole region is engulfed by the lunar night."(Sir Patrick Moore)

to the right is Langrenus notable for a 

-20 km wide terraced rim 3 km high on the eastern side

-1 km central peak

Langrenus

there is a ray system on the crater floor which appears when the sun is directly overhead (not evident in this image).  

In 1645, Michel Florent van Langren was the first person to draw a lunar map while giving names to many of the features. This is the only one of his named features that has retained his original designation (wikipedia). 

Among his contributions were attempts to determine longitude...He believed he could improve the accuracy of longitude determination, particularly at sea, by observing peaks and craters of the Moon as they appear and disappear, hence the map (wikipedia).

between the two craters lies Vendelinus, an ancient crater lacking a central peak who's rounded walls and floor are covered with newer impact craters.  

Vendelinus

image details:

camera ZWO ASI 290mm IR pass filter 850

celestron 11" Edge HD, no barlow

3865 frames @59 fps 6.928 ms gain 351

5/4/22 ~3 AM UTC (5/3/22 8 pm local)

East Bluff, CA

poor seeing, IR filter helped

refs:

https://en.wikipedia.org/wiki/Petavius_(crater)

https://www.skyatnightmagazine.com/astrophotography/moon/petavius-crater/

https://en.wikipedia.org/wiki/Langrenus_(crater)

https://en.wikipedia.org/wiki/Michael_van_Langren#Contributions

https://en.wikipedia.org/wiki/Vendelinus_(crater)