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PeterSurma
super member
Reged: 08/24/06
Posts: 122
Loc: Heidelberg, Germany
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Hi,
I've recently had the chance to visually observe (20" f/4, f=9mm Nagler EP) some dust filaments on the bulge region of M31 (I do not mean the obvious large dust lanes, but the tiny dust structures that can be seen on good photographs). Very weak features indeed. Sky quality was OK, but not really excellent, only 21.2mag/sas (SQM-L measured).
I could see 3 filaments, but only by field sweeping, though. Moving across the features makes them pop out eventually, but it's not easy really. Anyone who likes to try the same, see the images in my obs report (which were taken in the same night by a friend of mine using his TAK and a 5DMkII Canon DSLR):
http://eyes4skies.de/Internet/Astro/BeobachtungsReports/BeobachtungsReports_files/BeobReport_2009_09_25_TASU.htm#m31_dn_images
(sorry this is all german, but at least you may check out the images as some sort of finder chart)
The filaments appear pretty sharp-edged in photographs. But of course, they don't visually. They seem like diffuse,
coarse and long shadows on the bulge light. I'm sure I really detected them by eye, because I first searched, and then afterwards checked with photographs (not vice versa :-). So I verified 3 of them (see the shaded areas in the uppermost picture).
Was really thrilling + fascinating to see those features.
So have fun in M31. :-)
--------------------
Peter
Web: http://www.eyes4skies.de/home_EnglishVersion.htm
Scopes: From 3inch photographic APO to 20inch f/4 Dob
Edited by PeterSurma (10/08/09 04:36 PM)
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star drop
Guilty as Charged
Reged: 02/02/08
Posts: 16356
Loc: Snow Plop, WNY
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How steady was the seeing, Peter?
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Ted
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PeterSurma
super member
Reged: 08/24/06
Posts: 122
Loc: Heidelberg, Germany
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Ted,
well, seeing does not affect those dust features, I guess. Their size is roughly 3' x 10'. This is 2 orders of magnitude (factor of roughly 100) larger than a typical seeing disks. So actually I did not bother about the seeing, but it wasn't exceptionally bad neither. In terms of steadiness: well changed during the night a bit - most change comes from my mirror, which was still cooling (basically the whole night :-).
By the way: Here is the (horrible) Google translation of my obsreport page (sorry for this :-)
http://translate.google.com/translate?prev=hp&hl=de&js=y&u=http%3A%2F%2Feyes4skies.de%2FInternet%2FAstro%2FBeobachtungsReports%2FBeobachtungsReports_files%2FBeobReport_2009_09_25_TASU.htm&sl=de&tl=en&history_state0=
--------------------
Peter
Web: http://www.eyes4skies.de/home_EnglishVersion.htm
Scopes: From 3inch photographic APO to 20inch f/4 Dob
Edited by PeterSurma (10/09/09 04:03 AM)
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star drop
Guilty as Charged
Reged: 02/02/08
Posts: 16356
Loc: Snow Plop, WNY
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Thank you for the translation, Peter.
--------------------
Ted
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