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Astrophotography and Sketching >> Sketching

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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
"Frosty Leo"
      #5712501 - 03/04/13 01:13 PM Attachment (58 downloads)

Finally I found the little rascal! Actually, I thought it'd be a bit bigger and as I usually search at 85x I completely overlooked it at first. But here it is. Unfortunately I'm blocked at 206x for the moment because I cut my truss poles in order to be able to use my binoviewer without OCA. And that's not really enough for Frosty Leo. I could only see that it's a tiny "bar" with the lower part being slightly brighter. Well... I hope you like my impression...

Peter


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: "Frosty Leo" new [Re: PeterDob]
      #5712590 - 03/04/13 01:52 PM

Peter.

Nice. But what is this ??? An NGC object ? Never heard about it.

Andre.


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: Andrev]
      #5712641 - 03/04/13 02:28 PM

Its official designation is IRAS 09371+1212 since it was discovered by IRAS in 1987. Yet it's quite bright (mag 11 for a tiny surface) so already observable in modest scopes. The only problem is its minuscule size, which had me fooled for a while too...

Peter


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JeanB
Pooh-Bah


Reged: 07/11/11

Loc: Montreal, Canada
Re: "Frosty Leo" new [Re: PeterDob]
      #5712668 - 03/04/13 02:41 PM

Well a lot of valuable time spent finding and sketching this tiny fellow!

Great job.

Jean


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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: "Frosty Leo" new [Re: PeterDob]
      #5712895 - 03/04/13 04:52 PM

Peter,

Nice Sketch .

CS,KLU,

,

Tom


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Chopin
Canis Insanus
*****

Reged: 02/03/05

Loc: In the doghouse.
Re: "Frosty Leo" new [Re: niteskystargazer]
      #5713229 - 03/04/13 07:53 PM

Nice detective work, and a great sketch.

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Aquarellia
professor emeritus


Reged: 10/27/12

Loc: Provence, France
Re: "Frosty Leo" new [Re: Chopin]
      #5713639 - 03/04/13 11:56 PM

Great Peter, the quantity of nebulae you are able to sketch must be very high ! Your result is very interesting.

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starquake
sage


Reged: 02/02/08

Loc: Nádasdladány
Re: "Frosty Leo" new [Re: Aquarellia]
      #5713882 - 03/05/13 05:30 AM

Wow, thanks a lot for sharing this hidden treasure, I'll try to find it with my 12" scope, I guess this is one of those "I should be at the right place, but there's that star that doesn't match with the map" objects.

I've found that its coordinates are RA 9h 39m 53s and Dec +11° 58' 52", so I guess the designation refers to the J2000.0 epoch.


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: starquake]
      #5713986 - 03/05/13 08:37 AM

Thanks a lot guys!

Yes, you're right, Ferenc. I have to say that I wad a bit disappointed because its stated size (Wikipedia) made me believe it would be something like a reasonable planetary. Until I saw that little "star" that wasn't quite a "star".

Peter


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frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: "Frosty Leo" new [Re: PeterDob]
      #5714064 - 03/05/13 09:51 AM

Peter,

Very impressive capture.

Frank


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: "Frosty Leo" new [Re: frank5817]
      #5714147 - 03/05/13 10:37 AM

Why "Frosty"?

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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: Jef De Wit]
      #5715733 - 03/06/13 01:24 AM Attachment (31 downloads)

Many thanks, Frank!

@Jef: This is what Wikipedia says:

"Forveille et al. 1987 dubbed IRAS 09371+1212 as the "Frosty Leo Nebula" because of their interpretation of the object's extremely unusual far infrared spectrum that water is largely depleted in its gaseous state by ice condensation into grains and for its location in the Leo constellation."

With courtesy to my Italian astronomy friends, here's a map. Happy hunting!

Peter


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kenrenard
Carpal Tunnel


Reged: 12/13/12

Loc: Dunmore, PA
Re: "Frosty Leo" new [Re: PeterDob]
      #5718153 - 03/07/13 10:59 AM

I learned something new today. Great sketch and good information. Thanks

Ken


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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: "Frosty Leo" new [Re: kenrenard]
      #5718199 - 03/07/13 11:21 AM

This object is very overlooked. I've been observing it for years with my 63mm Zeiss. It is small, but clearly nonstellar at 120x. 191x shows a small, elongated glow, very much like in Peter's fine sketch.


Clear skies!
Thomas, Denmark


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: Astrojensen]
      #5718446 - 03/07/13 01:32 PM

Many thanks, Ken and Thomas! I didn't see a lot of "glow" though, but rather a slightly elongated and fuzzy star. But I agree completely. It's a very interesting object which is sadly overlooked. I hope that my post may change that...

Ciao!

Peter


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kenrenard
Carpal Tunnel


Reged: 12/13/12

Loc: Dunmore, PA
Re: "Frosty Leo" new [Re: PeterDob]
      #5718474 - 03/07/13 01:48 PM

Peter,
I end up learning more in the Sketching Forums than anywhere else. As a Novice you folks here are very skilled observers as well as artists. Clear Skies

Ken


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starquake
sage


Reged: 02/02/08

Loc: Nádasdladány
Re: "Frosty Leo" new [Re: kenrenard]
      #5719153 - 03/07/13 07:31 PM

Finally I was able to catch this little gem this evening! The seeing was quite bad, but for some moments it became excellent, and those moments were giving me some view I've never expected, I was able to see the dark band that divides the two halves of this protoplanetary nebula!! I never check these objects on images before I give them a go, to avoid tricking my brain, so I'm absolutely sure that I've seen the dark band - although absolutely not during the whole observation.

My sketch done at 469x with my 12" dob is attached to this post. FoV is 7', SQM: 21.16 MPSAS, 7°C.

Edit.. oops, I didn't wanted to hijack the thread, so I've removed the attachment because it was automatically displayed in the post, so here's the link instead: this is it

Edited by starquake (03/07/13 07:38 PM)


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: starquake]
      #5719845 - 03/08/13 04:20 AM

Don't worry about hijacking the thread, Ferenc! I appreciate your post a lot! Your sketch is superb and I wish I could've used the same mag as you because the division was invisible to me. Perhaps on a night with better seeing... My compliments!

Peter


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starquake
sage


Reged: 02/02/08

Loc: Nádasdladány
Re: "Frosty Leo" new [Re: PeterDob]
      #5720005 - 03/08/13 08:30 AM

Thank you, and thanks again for drawing my attention to this object. At 250x I could not see the dark band either, but sometimes magnification does miracles. I've tried everything: 71x, 167x, 250x, 300x, 375x, 469x, 600x, but under 375x details were missing, 600x was hopeless because of the seeing and somehow - although the same series of eyepieces - 469x was easier to focus than 375x.

My seeing was terrible too, and to tell the truth, most of the time the picture was blurred, but when we sketch, we're forced to look at an object for a longer time, and that might bring us some moments of rock solid seeing.

And another great benefit of high magnification sketching is that you don't have to mess too much with plotting the field stars.


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: Carù, Italy
Re: "Frosty Leo" new [Re: starquake]
      #5720210 - 03/08/13 10:26 AM

Hahaha... Very true! Amen!

Peter


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