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Mars Observation (January 3, 2010)

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#1 CarlosEH

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Posted 04 January 2010 - 02:34 PM

I made an observation of Mars on January 3, 2010 (06:00 U.T.) under average seeing conditions with brief moments of steadier seeing. I was unable to view the planet in blue light as clouds prevented me from doing so shortly after my IR/Magenta filter observation.

Date (U.T.): January 3, 2010
Time (U.T.): 06:00
CM 003.2* W
Ls 32.7* (Northern Spring/Southern Autumn)
De 17.7*, Ds 13.1*, phase 97%, 12.9"
Instrument: 9-inch (23-cm) F/13.5 Maksutov-Cassegrain
Magnification: 295x
Filters (Wratten) 30 (Magenta)
Seeing (1-10): 5 (brief moments of 6-7), Antoniadi (I-V) III
Transparency (1-6): 4

Notes:
The North Polar Cap (NPC) was brilliant (10/10) without any detail visible within it. A projection from the NPC is visible over it's southern border (following the CM). Sinus Sabaeus (3-5/10) and Sinus Meridiani (3-4/10) were visible on and preceding the CM. No haze/cloud is visible over Edom (7/10) at this time. Arabia/Aeria/Eden appear bright (7/10) but no other detail is visible over these regions. Deucalionis Regio appears bright (7/10) and Pandorae Fretum appears dusky to dull (4-5/10) whereas Noachis is obscured by a very bright (8/10) Evening Limb Haze (ELH). Cecropia (and Ortygia appear dark to dusky (3-4/10). Mare Acidalium appears dark to dusky (3-4/10) and Niliacus Lacus (3-4/10) separated by a bright (7/10) haze over Achillis Pons. Margaritifer Sinus, Mare Erythraeum, and Aurorae Sinus appear dark to dusky (3-4/10) and mottled. dusky (4/10) projections are noted to extend from the northern borders of Mare Erythraeum. Chryse/Xanthe appears bright (7/10) with a faint haze over it. An extremely to very bright (8-9/10) Evening Limb Haze (ELH), Morning Limb haze (MLH), and Southern Limb Haze (SLH) are visible.

A digital image produced using Pixelmator.

The best of luck observing Mars.

Regards,
Carlos

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#2 dweller25

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Posted 04 January 2010 - 02:42 PM

Carlos - that's amazing.

As you know I was also observing 1 hour later but my seeing was not good and my drawing only hinted at what you were able to see.

Thanks for posting.

#3 Jef De Wit

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Posted 04 January 2010 - 03:01 PM

Carlos

This sketch is impressive. What a detail you can get out of Mars :applause:

I have two questions:
1) What is exactly the cause of the limb haze? Is there an equivalent on earth? Kris and I are searching for a good Dutch translation of "limb haze" but are not sure of our try.
2) What means CM?

#4 Uwe Pilz

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Posted 04 January 2010 - 04:35 PM

Dear Carlos,

you saw lots of detail, congratulation. I had no chance to see the orographic clouds (limb haze) until now.

Dear Jef,

CM is the central meridian. More explanation about limb haze you can find here:
http://en.wikipedia....Orographic_lift

#5 sixela

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Posted 04 January 2010 - 04:40 PM

Mhh - if I'm not mistaken, orographic clouds are different beasts, like these over the volcano hills:


Posted Image

#6 Tommy5

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Posted 04 January 2010 - 05:59 PM

Great sketch of mars ,lots of detail especially in the northern hemisphere

#7 Kris.

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Posted 05 January 2010 - 05:13 AM

great sketch Carlos and a good report too! i've always found this side of mars the most challenging to observe & sketch eventough it's full of dark markings!

@ Jef:

...limb haze is caused by scattered light an dry ice particles high in the martian atmosphere. they may consist of CO2 crystals, fine dust, cirrus-type water clouds or a mixture of these...

...morning/evening clouds, often called limb arcs are bright isolated patches of surface fog or frost near the limb. the fogs usually dissipate by mid-morning, while the frost may persist most of the martian day, depending on the season...

orographic clouds cover entire mountains or mountain ranges.


from J.D.Beish' Observing the planet Mars.

#8 frank5817

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Posted 05 January 2010 - 11:59 AM

Carlos,

This is a beautiful Mars sketch. I enjoyed reading through your detailed description of features. :bow: :) :cool: :rainbow:
I am still waiting for a clear night when Mars culminates to get a good look and another sketch.

Frank :)

#9 Jef De Wit

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Posted 05 January 2010 - 02:35 PM

Uwe, Alexis and Kris

Thanks for the explenations. I still have a lot to learn...

#10 mikesemmler

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Posted 06 January 2010 - 07:07 AM

carlos - one oft the best mars sketches
i ever saw - :bow: :bow:

Michael

#11 niteskystargazer

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Posted 06 January 2010 - 12:30 PM

Carlos,

:waytogo:, Nice sketch. :).

:thanx:,

Tom

#12 CarlosEH

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Posted 06 January 2010 - 03:40 PM

Thank you all for the kind compliments on my my Mars observation. I was fortunate to experience brief moments of steady seeing that allowed me to see the detail noted.

Kris and Uwe- Thank you for explaining the central meridian (CM) and limb haze. The limb haze noted over Mars is comprised of carbon dioxide crystals, fine dust particles, and cirrus-type water ice clouds viewed at an oblique angle which increases the apparent thickness of the material observed. The limb haze is enhanced while using Wratten 80A (Light Blue), 38 (Blue), or 47 (violet) filters.

I have labeled the major albedo features noted. I hope that this helps.

The best of luck observing Mars.

Carlos

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#13 CarlosEH

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Posted 06 January 2010 - 03:42 PM

A comparison between oblique views of the horizons of the Earth and Mars obtained by spacecraft. The thickened layers of clouds over the horizon produce the limb haze noted from the Earth.

Carlos

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#14 ericj

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Posted 12 January 2010 - 12:39 PM

Hi Carlos,

Thanks for posting your fine sketch. As always it shows a wealth of very fine detail.

I look forward to your future observations.

Clear Skies,

Eric Jamison

#15 Jef De Wit

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Posted 13 January 2010 - 07:27 AM

Congratulations with your ASOD!

#16 CarlosEH

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Posted 13 January 2010 - 09:31 AM

Jef,

Thank you for the recognition of my observation on ASOD. Having an observation recognized by ASOD among so many other quality observations is an honor. The best of luck in your own observations.

Carlos

#17 mike bacanin

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Posted 14 January 2010 - 12:43 PM

Carlos,

Beautifully rendered observation of Mars. I've enjoyed it very much.

Regards
Mike

#18 CarlosEH

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Posted 14 January 2010 - 02:35 PM

Mike,

Thank you for the compliment on my Mars observation. I hope that you get a chance to observe Mars yourself. The best of luck and may you have a Happy New Year!

Carlos






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