Solar&Planetary LtE Now for CMO/ISMO in January 2023

Solar & Planetary LtE Now in January 2023

Not every email is necessarily cited in the PDF’s CMO LtE

To see the preceding ones, click

LtE in December 2022

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The latest is at the top

¤••••• Subject: Mars - Jan. 30th

Received: 1 February 2023 at 13:04 JST

Hi to All!, Here are my most recent sessions.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230130/EMr30Jan23.png

Efrain MORALES RIVERA (Aguadilla, Puerto Rico)

¤••••• Subject: Mars 2023/01/31-Kumamori

Received: 1 February 2023 at 12:15 JST

Mars Image on 31 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230131/Km31Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars: January 31, 2023

Received: 1 February 2023 at 11:24 JST

Hi,

I have attached my image of Mars January 31, 2023 at 1:24 UT.

Best,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230131/FMl31Jan23.png

Frank J MELILLO (Holtsville, NY)

¤••••• Subject: Mars 2023/01/30-Kumamori

Received: 31 January 2023 at 11:07 JST

Mars Image on 30 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230130/Km30Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars 2023/01/29-Kumamori

Received: 30 January 2023 at 12:10 JST

Mars Image on 29 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230129/Km29Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars M230129 ishibashi

Received: 30 January 2023 at 09:04 JST

Mars Images on 29 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230129/Is29Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars: January 28, 2023

Received: 29 January 2023 at １3:05 JST

Hi,

I have attached my image of Mars January 28, 2023 at 2:58 UT.

Best,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230128/FMl28Jan23.png

Frank J MELILLO (Holtsville, NY)

Received: 29 January 2023 at １２:59 JST

Hi to All!, Here are my most recent sessions.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230126/EMr26Jan23.png

Efrain MORALES RIVERA (Aguadilla, Puerto Rico)

¤••••• Subject: Mars Jan 27

Received: 27 January 2023 at １２:01 JST

It has been a long time since I have sent an image but the seeing and clouds here in the central USA have not been the best but a decent image tonight taken with a Celestron 8 inch telescope.

Thank you

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230127/TWl27Jan23.png

Tim WILSON (Jefferson City, MO)

¤••••• Subject: Mars 24th Jan 2023

Received: 27 January 2023 at 08:21 JST

Hi,

Mars in good seeing from 24th Jan.

Also here: https://skyinspector.co.uk/mars/#bwg3/1206

Best wishes

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230124/MLw24Jan23.png

Martin LEWIS (St.Albans, the UK)

¤••••• Subject: Venus 2023 January 24

Received: 25 January 2023 at 05:07 JST

Hello all, here is my first Venus IR image of the elongation.

Terrible seeing, but a little bit of cloud shading apparent.

David ARDITTI (Edgware, Middx., the UK)

¤••••• Subject: Mars - January 16th

Received: 24 January 2023 at 05:06 JST

Hi to All!, Here are my most recent session.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230116/EMr16Jan23.png

Efrain MORALES RIVERA (Aguadilla, Puerto Rico)

¤••••• Subject: Mars 2023/01/21-Kumamori

Received: 22 January 2023 at 12:22 JST

Mars Images on 21 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230121/Km21Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars 2023/01/20

Received: 22 January 2023 at 04:18 JST

Hello,

My last image of Mars 2023/01/20

----------------------------------------------

Observer : Xavier Dupont

350mm Dall-Kirkham

ASI 662mc

----------------------------------------------

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230120/XDp20Jan23.png

Xavier DUPONT (Saint-Roch, FRANCE)

¤••••• Subject: Mars: January 17, 2023

Received: 21 January 2023 at 14:00 JST

Hi,

I have attached my decent image of Mars January 17, 2023 at 3:13 UT.

Thanks,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230117/FMl17Jan23.png

Frank J MELILLO (Holtsville, NY)

¤••••• Subject: Mars 2023/01/19-Kumamori

Received: 20 January 2023 at 15:28 JST

Mars Images on 19 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230119/Km19Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Re: [hstjupiter] A bright spot on Io (October 2nd.)

Received: 20 January 2023 at 06:53 JST

Hi Damian,

Most interesting. The only thing that puzzles me is the CML on Io. Because Io is moving behind Jupiter it is rotating left to right when seen north up. I was surprised how much it does rotate when traversing the planet or being occulted by it. Check out this side by side comparison of Io from the WinJUPOS simulation for the times of your captures. You can see that the features visible in the earlier image (left) have rotated to the right in the later image. However, the spot in your images seems to have rotated left.

Cheers, Niall

Niall MacNEI (NSW,AUSTRALIA)

¤••••• Subject: Re: [hstjupiter] A bright spot on Io (October 2nd.)

Received: 20 January 2023 at 02:24 JST

Hi all,

Thanks for all of the feedback. The spot is also present in the R and G filter data and also in data captured by Ian Sharp at the same time so its certainly a real feature.

I actually found another set of B filter data after Io emerged from occultation later in the night. The feature is still visible but the CML is slightly different.

http://www.damianpeach.com/barbados22/2022-10-02-0054_4-BLUEIO2dp.jpg

Best wishes,

Damian PEACH (Selsey, WS, the UK)

Web: http://www.damianpeach.com/

¤••••• Subject: Re: [hstjupiter] A bright spot on Io (October 2nd.)

Received: 19 January 2023 at 18:36 JST

I was imaging a few feet away from Damian with another C14 and Saturn-M camera. At the time (the following morning on Facebook) I posted a green image just to show the pretty transits, but I only stacked on the planet. I'm away for another 3 weeks so can't check but Damian has all of my data.

Cheers

Ian SHARP (Ham, nr.Selsey, the UK)

¤••••• Subject: Re: [hstjupiter] A bright spot on Io (October 2nd.)

Received: 19 January 2023 at 08:28 JST

I imaged Jupiter that day, but I got the anti-Jovian side of Io, rather than the pro-Jovian side which Damian imaged. However, I had a quick look at PVOL and Jean-Luc Dauvergne imaged Jupiter on the 3rd and he also captured the pro-Jovian side of Io. His resolution looks decent, although the image is somewhat oversaturated. Nevertheless there is, to my eye, a strong hint of a white spot and supporting evidence that the feature is real. Perhaps we could ask J-L to look at his raw data with a view to enhancing the view of Io and perhaps improving the contrast.

Regards, Niall

Niall MacNEI (NSW,AUSTRALIA)

¤••••• Subject: Re: A bright spot on Io (October 2nd.)

Received: 19 January 2023 at 07:56 JST

That's very interesting Damian, active volcanoes on Io should in theory be within the reach of amateur scopes, but it would require near perfect seeing and a good high contrast feature like the one you've found here. Bright spots near the centre of small bright disks can be caused by other more mundane things such as diffraction or enhancement artifacts, but yours seems to be a little off centre which makes it more likely to be a real feature on the surface. It's a shame Io doesn't rotate fast enough to see movement over the good patch of seeing on any particular night, but instead maybe we can find a matching image from another observer on that same night..? It seems like this bright feature was quite high contrast in blue and so maybe it can be picked out from data captured even in less than perfect seeing. It wouldn't need to be anywhere near as clear as seen in your image to be valid as a confirmation.

I guess it's too late for any targeted followup observations as a few months have gone by now but I wonder if there have been any serendipitous images of Io captured by large observatories showing this longitude in the intervening time ?

cheers, Anthony

Anthony WESLEY (QLD, AUSTRALIA)

¤••••• Subject: Re: [hstjupiter] A bright spot on Io (October 2nd.)

Received: 19 January 2023 at 04:03 JST

Hi Damian,

That’s a remarkable image and a remarkable bright spot on Io. It seems surprising as large new volcanic deposits on Io are usually dark or red, so would not appear bright in a blue image. Here is a composite of your image with USGS maps and recent Juno north polar views, identifying common features in that region. Your bright spot maps best to Acala Fluctus (slightly SE of Tiermes Patera), which was mapped as a mixed area of volcanic flows surrounded by whitish deposits. Notably, in the JunoCam images Acala Fluctus looks more completely and brightly white, surrounded by a grey area. This could be merely due to the different viewing angle (this can be very deceptive on Io), or it could indicate a real change. Perhaps your image shows this bright white feature with slight contrast enhancement?

If the change is real, it could be due to new emission of white material (SO2?) since the Galileo era. The JIRAM thermal image shows emission from the Loki lava lake on the limb, but may be too far north to show whether there is any emission from Acala Fluctus. No doubt there is plenty of thermal-imaging data archived, from JIRAM over the last few years and from Keck etc. over the last 20 years, if anyone wants to investigate. And perhaps JunoCam will get better images of this region at some forthcoming perijoves.

Comments from real Io experts like Jason Perry or John Spencer or Frank Marchis would be valuable.

Best wishes,

Received: 19 January 2023 at 04:04 JST

PS:
The JunoCam images shown here reveal no evident changes over 5 months but are notable for showing Loki Patera (still with its bright central ‘island’ after 43 years!) and Dazhbog Patera (much darker than in the Voyager/Galileo maps).

Jhon ROGERS (the UK)

¤••••• Subject: A bright spot on Io (October 2nd.)

Received: 19 January 2023 at 00:19 JST

Hi all,

While trawling through data from Barbados i came across this very interesting image from October 2nd obtained through a blue filter in near perfect seeing. It shows a distinct bright spot on Jupiter's volcanic moon Io. Consulting the USGS map the feature matches Tiermes Patera.

The feature is definitely not an artifact - even with very modest sharpening it is obvious. Io at this time was almost as large as it can ever appear from Earth at 1.27" arc seconds while the resolving power of the telescope is at is maximum is short wavelengths.

http://www.damianpeach.com/barbados22/2022-10-02-0054_4-BLUEIOdp.jpg

Best wishes,

Damian PEACH (Selsey, WS, the UK)

¤••••• Subject: Mars M230118 ishibashi

Received: 18 January 2023 at 23:10 JST

Mars Images on 18 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230118/Is18Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars 15th Jan 2023 and 17th Jan 2023

Received: 18 January 2023 at 09:11 JST

Resending my image from the other day which had the wrong date on it.

Also a new image from tonight at almost the same CM but in better seeing.

Best regards,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230115/MLw15Jan23.png

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230117/MLw17Jan23.png

Martin LEWIS (St.Albans, the UK)

¤••••• Subject: Mars - January 14th

Received: 16 January 2023 at 23:52 JST

Hi to All!,

Here are my most recent sessions.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230114/EMr14Jan23.png

Efrain MORALES RIVERA (Aguadilla, Puerto Rico)

¤••••• Subject: Mars 15th Jan 2023

Received: 16 January 2023 at 09:33 JST

A shrinking Mars from this evening, in just usable seeing.

Details on the image,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230115/MLw15Jan23.png

Best wishes

Martin LEWIS (St.Albans, the UK)

¤••••• Subject: Mars January 14th and 15th

Received: 16 January 2023 at 05:44 JST

Dear Masami,

Attached are images of Mars from January 14th and 15th that I would like to submit to CMO.

An interesting thin “doughnut” cloud in the south at around -60deg just east of the central meridian shows up on the images from both nights.

Best wishes

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230114/WFl14Jan23.png

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230115/WFl15Jan23.png

Bill FLANAGAN (Houston, TX)

¤••••• Subject: Mars 13 January 19.06UT RGB IR

Received: 14 January 2023 at 16:56 JST

Hi all,

Image set from yesterday evening, with Solis Lacus at upper left.

There appears to be some equatorial cloud in the Valles Marineris region at centre left.

It was a pity a short spell of nice seeing that I had just after sunset did not extend to the Mars session, as a breeze picked up and the seeing degraded.

Out of interest, I also share the stunning sunset (it really was a beautiful mild evening with no wind for a while), with the Gamsberg mountain 30kms away silhouetted against the sky and the temporary setup in the garden on the farm. We will be continuing with the earthworks for the observatory rebuild shortly.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230113/CFs13Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars 12 January 19.21UT RGB IR

Received: 13 January 2023 at 17:34 JST

Hi all,

After a number of cloudy evenings, I did not expect to image yesterday evening as further cloud was forecast.

However, I did manage to find some clear sky. Unfortunately the whole imaging session was plagued by a strong, gusting wind, and also poor seeing.

The IR to some extent saved the day.

Solis Lacus is at upper left with the Valles Marineris complex extending in from centre left.

Olympus Mons is almost on the CM at lower centre.

Although the bright limb was probably reduced by the poor conditions, I nonetheless made use of Anthony Wesley’s input and advice, which I acknowledge with appreciation.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230112/CFs12Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars 2023/01/12-Kumamori

Received: 13 January 2023 at 17:29 JST

Mars Images on 12 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230112/Km12Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars M230112 ishibashi

Received: 12 January 2023 at 23:39 JST

Mars Images on 12 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230112/Is12Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars 2023/01/11-Kumamori

Received: 12 January 2023 at 12:00 JST

Mars Images on 11 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230111/Km11Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars M230111 ishibashi

Received: 12 January 2023 at 10:55 JST

Mars Images on 11 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230111/Is11Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars January 11, 2023

Received: 12 January 2023 at 04:47 JST

Dear Masami,

Attached is an image set of Mars from January 11th that I would like to submit to CMO.

An LRGB composite taken with a BW camera.

Best wishes

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230111/WFl11Jan23.png

Bill FLANAGAN (Houston, TX)

¤••••• Subject: Mars: January 10, 2023

Received: 11 January 2023 at 10:49 JST

Hi,

I have attached my image of Mars January 10, 2023 at 2:49 UT.

Thanks,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230110/FMl10Jan23.png

Frank J MELILLO (Holtsville, NY)

¤••••• Subject: Mars 2023/01/10-Kumamori

Received: 11 January 2023 at 10:13 JST

Mars Images on 10 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230110/Km10Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars M230109 ishibashi

Received: 10 January 2023 at 07:59 JST

Mars Images on 9 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230109/Is09Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars January 4th, 6th, and 7th

Received: 10 January 2023 at 06:00 JST

Dear Masami,

Attached are some images of Mars from January 4th, 6th, and 7th that I would like to submit to CMO. These were shot with a new color camera I got in December.

On the nights of the 6th and 7th I shot a set of exposures through a blue filter which seemed to give better results for discriminating clouds in the blue image than just using to blue channel from the color sensor. The color images were shot through a luminance filter to reject UV and IR.

Best wishes

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230104/WFl04Jan23.png

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230106/WFl06Jan23.png

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230107/WFl07Jan23.png

Bill FLANAGAN (Houston, TX)

¤••••• Subject: Mars 8 January 19.33UT RGB IR

Received: 9 January 2023 at 15:58 JST

Hi all,

Th recent trend of improved seeing as the evening progressed didn’t happen last night and I was only able to capture a single set of useable RGB data before a sudden and dramatic degradation in seeing conditions, which ended the session before I could capture any IR data.

The Arsia Mons cloud which has been evident on the limb the last few days has come into view and I suspect that the bright limb effect that I have been seeing recently may be due to general cloud over the Tharsis region.

Cloud is forecast for the next few days, so I may be unable to image.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230108/CFs08Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars M230108 ishibashi

Received: 9 January 2023 at 09:20 JST

Mars Images on 8 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230108/Is08Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars: January 8. 2023

Received: 9 January 2023 at 08:42 JST

Hi,

I have attached my latest images of Mars January 8, 2023 at 2:53 UT and 5:16 UT.

Thanks,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230108/FMl08Jan23.png

Frank J MELILLO (Holtsville, NY)

¤••••• Subject: mars 2023/01/02

Received: 9 January 2023 at 02:46 JST

Hello,

My first image of Mars this year !

----------------------------------------------

Observer : Xavier Dupont

350mm Dall-Kirkham

ASI 662mc

----------------------------------------------

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230102/XDp02Jan23.png

Xavier DUPONT (Saint-Roch, FRANCE)

¤••••• Subject: Mars 7 January 19.36UT RGB IR

Received: 8 January 2023 at 18:06 JST

Hi all,

Image set from last night.

M Sirenum and M Cimmerium extend across the upper regions of the planet. Amazonis and Trivium Charontis across the centre with Propontis I lower centre and Elysium lower right.

The Arsia Mons cloud on the bright limb remains prominent.

I must again pay credit to Makoto Adachi of Alpo-Japan for the work that he has done on the Mars maps he produced last year (available on the Alpo-Japan Mars page). A very valuable resource.

I am having a personal battle with over saturation of the bright limb during processing, and will try and subdue it in coming days!

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230107/CFs07Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars M230107 ishibashi

Received: 8 January 2023 at 10:23 JST

Mars Images on 7 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230107/Is07Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars images, 2022 August 7 - December 27

Received: 7 January 2023 at 18:23 JST

Dear all,

I'm attaching here some Mars images from the fall which I have now had time to process. Most of them are not particularly detailed but included anyway for documentation, and for some the seeing was even too poor for color imaging. These are in addition to the early images from August and a couple of the October dust storm which I submitted previously.

All of the images in the zip file were obtained with my homebuilt 52 cm Newtonian. The other image is a test shot with the remote 17 inch CDK at Oria Spain operated by SAAF using a new 6200MM camera unbinned (0.26"/pix) and Bessel filters - not an ideal setup but useful during Swedish winter when skies are almost constantly grey.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/221124/JWr24Nov22.png

The very small SPC was seen at good seeing until early September. The NPH has been prominent towards the end of the year. Morning and evening clouds have been sparse and faint and primarily on the southern hemisphere. On December 12 and 14 Olympus Mons was seen bright and protruding on the morning limb.

With best regards and best wishes for the new year,

Johan

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/index_JWr.html

Johan WARELL (Skurup, SWEDEN)

Director, SAAF Remote Telescope Section

Lindby Observatory (K60), Skurup, Sweden

¤••••• Subject: Mars 2023/01/06-Kumamori

Received: 7 January 2023 at 16:59 JST

Mars Images on 6 January 2023

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230106/Km06Jan23.png

Best regards,

Teruaki KUMAMORI (Osaka, JAPAN)

¤••••• Subject: Mars 6 January 19.44UT RGB IR

Received: 7 January 2023 at 16:45 JST

Hi all,

A real challenge last night with strong, gusting winds making things very difficult, and seeing looked poor on screen. The IR managed to cut through the seeing best and the planet appears to be clear of any significant dust. With me imaging a bit later, this view is similar to the previous evening with Elysium at lower right.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230106/CFs06Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars January 2, 3rd

Received: 7 January 2023 at 05:10 JST

Hi to All!,

Here are my latest sessions.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230102/EMr02Jan23.png

Efrain MORALES RIVERA (Aguadilla, Puerto Rico)

¤••••• Subject: Mars 5 January 19.14UT RGB IR

Received: 6 January 2023 at 18:00 JST

Hi all,

Image set from yesterday evening in what looked like fairly poor conditions on screen (alt 40 deg), but the results didn’t come out too bad.

Elysium is at lower right. The IR shows some nice surface detail, including features extending towards the south polar region at top. There are some nice sweeping clouds in the south and during processing, Winjupos indicated that the bright cloud on the left limb (B image) corresponds to Arsia Mons.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230105/CFs05Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars 2nd Jan 2022

Received: 6 January 2023 at 08:43 JST

Happy New Year to All,

Here is my first Mars of 2023, imaged in moderate seeing – hopefully lots more to come.

Also visible here: https://skyinspector.co.uk/mars/

Best wishes

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230102/MLw02Jan23.png

Martin LEWIS (St, Albans, the UK)

¤••••• Subject: Mars 4 January 19.25UT RGB IR

Received: 5 January 2023 at 17:01 JST

Hi all,

My first Mars image set from the New Year.

I was pleasantly surprised with the results given that there was a stiff south westerly blowing throughout the evening with some pretty strong gusts.

Elysium is at lower centre with the S Gomer extensions(Curiosity rover) just to the right of centre.

Some cloud in the SW in the direction of Hellas.

With me having missed a number of nights due to cloud and (very welcome) rain, the drop in size since my last image set was very noticeable during processing.

Best regards, Clyde

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230104/CFs04Jan23.png

Clyde FOSTER (Khomas, NAMIBIA)

¤••••• Subject: Mars image - December 26

Received: 5 January 2023 at 10:56 JST

Sir,

Attached is a set of Mars images from December 26.

Poor seeing (2/5). Good transparency.

Regards,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/221226/PGc26Dec22.png

Peter GORCZYNSKI (Oxford, CT)

¤••••• Subject: Mars M230103 ishibashi

Received: 4 January 2023 at 08:13 JST

Mars Images on 3 January 2023.

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230103/Is03Jan23.png

Best regards,

Tsutom ISHIBASHI (Kanagawa, JAPAN)

¤••••• Subject: Mars: January 2, 2023

Received: 3 January 2023 at 10:38 JST

Hi,

Happy New Year!

I am sending you my image of Mars January 2, 2023 at 1:58 UT.

Thanks,

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/230102/FMl02Jan23.png

Frank J MELILLO (Holtsville, NY)

¤••••• Subject: Geometric albedo of Mars, December 9th 2022

Received: 3 January 2023 at 05:17 JST

Happy new year everyone !

Here is the last part of my prolific night of observation from early December. This is the geometric albedo of Mars in various bands, calculated from stars observed at the same airmass through differential photometry corrected by transformation of magnitudes and colors.

All value look a bit brighter than the normal, which could be the sign of the opposition surge effect - despite the fact that the B band is right on historical track, and not particularily bright.

The sloan u' is largely just an experience ; the band encounters various limitations, uncertainty of the catalogue magnitudes of the stars, effective passband limited to 340/350 nm... Despite this the value obtained is less than 2 hundreds of magnitude from the expected value.

The B425 is a non photometric filter for which no references are available. But considering that its passband is fully comprised into that of the B filter, almost with the same center of transmission, custom references have been inferred from the B values directly through differential photometry and no color terms. The value < to 8% is coherent with what could be expected from a filter whose passband is centered on a slightly dimmer part of the planetary's spectrum than that of the broader B filter. I think it should be possible to calibrate the the B436/10 filter with the same method :)

Attached is also a set of photometric images just psf-processed. The completely processed images have been sent already.

Best regards,

Christophe PELLIER (Nantes, FRANCE)

¤••••• Subject: Mars, Dec 31 RGB

Received: 1 January 2023 at 10:37 JST

Hi all, here's an image of Mars from last night in good seeing.

The seeing was steady over about 30 minutes, allowing me to record several RGB data sets.

Olympus Mons is visible just right of centre in the northern hemisphere, the circular shape of the central peak surrounded by its characteristic diamond-shaped terrain. The other three Tharsis volcanoes are visible lower down and closer to the right hand limb, starting with Arsia Mons showing quite a lot of white cloud, then Pavonis Mons to its upper right also showing some cloud, but much fainter, and then Ascraeus Mons which also shows a faint wisp of cloud if you look closely. A lot of bright cloud is visible over the right hand limb, and some fainter cloud is visible down in the southern hemisphere.

best regards
Anthony

Link:
http://www.acquerra.com.au/astro/gallery/mars/index.live?dir=/mars&image=20221231-131642

https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2022/221231/AWs31Dec22.png

Anthony WESLEY (QLD, AUSTRALIA)