Jeff Young
Post Laureate
Reged: 08/04/05
Posts: 3169
Loc: Ireland
|
|
Got another look, this time with some field stars. The bright, circular halo has a diameter slightly less than half the distance between HIP17827 and HIP 17772, which are about 8.5' apart. I'd therefore put the halo at around 3.8'.
-- Jeff.
--------------------
Nikon 18x70s / UA Millennium Colorado:
Solarscope SF70 / TV Pronto / AP400QMD Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-100 / AP1200GTO Tak Mewlon 250 / AP600EGTO
|
polaris
member
Reged: 05/02/05
Posts: 82
Loc: Kaunas, Lithuania
|
|
Well, I still couldn't get a good view, only through high clouds, and this time the clouds were quite thick, and the moon was quite close (34° away), but the comet still put on a great display! Unbelievable! I took 38 frames 5 seconds each with a 6" f/5 reflector and Canon 350D, at ISO200. Separate frames didn't show any color, but the stack revealed it:
(BTW, pics taken around 21:30UT, Oct 26)
Edited by polaris (10/26/07 07:57 PM)
|
djeber2
sage
Reged: 07/02/04
Posts: 493
Loc: Ohio
|
|
Polaris, great pic, thanks.
I just came in from a quick look at the comet thru a gap in the clouds. Now its raining again. That large circular halo is very interesting.
--------------------
Don
1 Dob: Hardin DSH10
4 Small scopes: Celestron ED80, Meade 114NT/500 4.5", Orion 102 Mak, Orion 100mm Astroview
2 Classic Scopes: 4.25" Edmunds reflector, Sears 60mm Discovery
4 Binoculars: 15x70 Celestron skymaster, 10x42 Celestron Regal, 8x40 Nikon Action, 10x50 Orion Binoculars
|
chanda7
super member
Reged: 08/06/07
Posts: 148
Loc: Southeast TN
|
|
 I see it, I see it! We've had some light clouds come in here and there, but the wait is over! I don't have any past comets to compare it to in unusualness, but it is very cool 8) The pics and sketches here have been just like it appears in the scope.
--------------------
Chanda
Orion XT8 Classic, ultra-cheap 10x50 binoculars
|
veebs2
sage
Reged: 03/13/07
Posts: 206
Loc: DeKalb, IL
|
|
Rain, rain, go away... 
--------------------
Paul
Zhumell 10" (My Mistress - name given by my wife)
Hyperions - 5mm, 13mm and 24mm
Stratus - 8mm and 17mm
Howie Glatter 2"-1 1/4" Holograpic w/ Barlow
Lumicon OIII Filter
Telrad
DeKalb, IL
Edited by veebs2 (10/26/07 10:11 PM)
|
Refractor6
Post Laureate
Reged: 10/20/04
Posts: 3144
Loc: Vancouver B.C. , Canada
|
|
UNBELIEVABLE!!!. Got it right after sunset. Never seen anything quite like this,the color,the size and the detailed structure. What a treat!.
152 f/6.5 refractor with Meade 28mm SWA ep at 35 power.
---------------
Stan
Takahashi FS-102 NSV
Antares 152 f/8 prototype
Antares 152 f/6.5
Antares 127 f/6.45 prototype
Orion 9x63 mini giants
Pentax 20x60 PCF WP
|
plutarko
journeyman
Reged: 03/12/07
Posts: 9
|
|
Hi
Last picture here at 2007/10/26 - 2300UT
Taken Celestron SC8 f/10 and spc900 webcam, about 700 frames .
David Cardeņosa
Edited by plutarko (10/26/07 10:51 PM)
|
chanda7
super member
Reged: 08/06/07
Posts: 148
Loc: Southeast TN
|
|
I tried to get a picture while I was out. This one is with a XT8 (32mm Orion Highlights plossl) and a Coolpix 4500 on a tripod.
--------------------
Chanda
Orion XT8 Classic, ultra-cheap 10x50 binoculars
|
Glassthrower
Vendor - Galactic Stone & Ironworks
Reged: 04/07/05
Posts: 14687
Loc: Hurricane Alley
|
|
I just came in from another look with the classic Asahi-Pentax 50/600 at mags from 15x to 66x.
The yellow color is gone, to my eyes. It is now a creamy/ivory color. Not quite white, but definitely not yellowish.
Also, the nucleus seems to have faded a bit. It is not as bright in comparison to the coma as it was last night. The nucleus is still quite bright overall and easily seen, but it does not jump out from the surrounding halo/coma as blatantly as before. Also, the nucleus seems ever so slightly off-center - towards the 10-oclock position in a reversed view or 4-oclock in a correct view. Still no sign of a tail. It still resembles a defocused planet or a planetary nebula on anabolic steroids.
Using nearby stars as a gauge, I put it's magnitude just about equal with Delta Persei which is ~3.
I think it's starting to fade folks.
Regards and clear skies,
MikeG
--------------------
Michael Gilmer - Member of the Meteoritical Society & Collector of Falling Stars.
Galactic Stone & Ironworks - Buy/Sell/Trade Meteorites, Moon Rocks, Mars Rocks, & 35 different falls and types!
|
Tuugii
professor emeritus
Reged: 03/22/07
Posts: 522
Loc: Ulaanbaatar, Mongolia
|
|
The above image was obtained yesterday night through the University of Arizona's Steward Observatory 0.5 meter telescope in Tucson.
The large round outer coma is about 2 arcminutes in diameter as viewed from Earth - or nearly 87,000 miles across - the size of the planet Jupiter!!! Given that this shell of dust was generated two days ago (~50 hours), which means the expansion rate is almost 1490km/h!!!! isn't it impressive? 
Tuugii
--------------------
telescope=time machine...
|
Jimbo100
Pooh-Bah
Reged: 08/26/05
Posts: 1096
Loc: Oxford, UK.
|
|
Good pictures/ images/ sketches everyone. 
Polaris your image closely matches what I saw through my 80mm refractor just now.
As for the comet itself; "Ain't it the darnest thing!!"
|
polaris
member
Reged: 05/02/05
Posts: 82
Loc: Kaunas, Lithuania
|
|
I wonder what is that dark blue halo around the comet that can be seen in Tuugii's pic, as well as mine. Is it just some jpg artefact or anything else?
|
rusirius6278
Carpal Tunnel
Reged: 11/03/06
Posts: 1722
|
|
Quote:
Well, I still couldn't get a good view, only through high clouds, and this time the clouds were quite thick, and the moon was quite close (34° away), but the comet still put on a great display! Unbelievable! I took 38 frames 5 seconds each with a 6" f/5 reflector and Canon 350D, at ISO200. Separate frames didn't show any color, but the stack revealed it:
(BTW, pics taken around 21:30UT, Oct 26)
excellent pic...and also somewhat close to how my new Vixen ED103SWT Apo showed it at only 88x...i tried higher powers in both my Vixen Apos...and altho still very beautiful at higher powers, the 88x view thru the ED103S is the one i kept going back to...and turned out to be the most beautiful view of the comet thru both scopes last night...
imho, it`s one of the most amazing/awesome sights i`ve ever seen thru a telescope...and a very strange looking sight/comet, indeed... 
that said, i`d still love to see this thing thru this Apo in a dark sky with good seeing...keeping fingers, toes, etc., crossed...  
btw, imho, all the pics, sketches, etc., are excellent/beautiful, etc...Please keep them coming...
Jim
--------------------
current scopes
Vixen ED103SWT
Vixen ED102S
C-102AZ/HD
StarMax 127
Jason 60/11.7
UO HD Abbe Orthos - 5mm, 6mm, 7mm, 9mm
Older UO Ortho - 4mm
Celestron 2x Ultima Barlow
and many other scopes i`ve been fortunate enough to check out...
Edited by rusirius6278 (10/27/07 04:18 AM)
|
Mike B.
Pooh-Bah
Reged: 10/24/05
Posts: 1466
Loc: Louisiana
|
|
I got a chance to observe the comet with 20x70 binos and with my SN-8 through the camera viewfinder. Gotta be one of the weirdest comets I've ever seen! lol
I managed to get some images with a DSLR and a webcam. Here's one showing some of the extended coma of 17p:
Comet 17p Holmes. 25x30 sec @ ISO 100. Meade SN-8 at F/4, MPCC, IDAS-LPS, Hutech Canon 350XT, Atlas EQ-G w/EQMOD.
--------------------
Clear skies!
Mike B.
My Homepage and Astrophotos
|
Tuugii
professor emeritus
Reged: 03/22/07
Posts: 522
Loc: Ulaanbaatar, Mongolia
|
|
Quote:
I wonder what is that dark blue halo around the comet that can be seen in Tuugii's pic, as well as mine. Is it just some jpg artefact or anything else?
I am sure it is not any jpg artifact. The large round outer coma is about 2 arcminutes in diameter as viewed from Earth - or nearly 87,000 miles across - the size of the planet Jupiter. Given that this shell of dust was generated two days ago (~50 hours), which means the expansion rate is almost 1490km/h.
As tonk had said, this giant cloud of gas is shined by the direct sunlight, hence it is yellow. Perhaps, if someone has spectroscopic datas, then we might give even better guesses.
BTW nice shot!
--------------------
telescope=time machine...
|
Tuugii
professor emeritus
Reged: 03/22/07
Posts: 522
Loc: Ulaanbaatar, Mongolia
|
|
Mike, that is a killer image!  very nice!
--------------------
telescope=time machine...
|
Bill Weir
scholastic sledgehammer
Reged: 06/01/04
Posts: 893
Loc: Metchosin (Victoria), Canada
|
|
You must have just taken that. Your image matches perfectly what I sketch. That little star on the edge of the bright ring with the fainter halo extending out to that pair of stars at 3 o'clock ad to the pair of stars that are on an angle heading to the bottom of the image. I was observing with my 12.5" truss.
I'm tired and won't scan the sketch until the AM.
Bill
--------------------
6'' Orion SkyQuest
12.5'' f/5 Custom Truss Dob
William Optics 80mm ZenithStar II ED Doublet
f/5 25" newtonian on a giant GEM, any time I want
Observing sessions grand total for 2007, 171.
So far in 2008, 115
|
Mike B.
Pooh-Bah
Reged: 10/24/05
Posts: 1466
Loc: Louisiana
|
|
Quote:
You must have just taken that. Your image matches perfectly what I sketch. That little star on the edge of the bright ring with the fainter halo extending out to that pair of stars at 3 o'clock ad to the pair of stars that are on an angle heading to the bottom of the image.
Yes, I just took it! I'm still shooting as I type this.
--------------------
Clear skies!
Mike B.
My Homepage and Astrophotos
|
Jeff Young
Post Laureate
Reged: 08/04/05
Posts: 3169
Loc: Ireland
|
|
Mike --
Great shot! That's the first image I remember seeing that captures the annular characteristic of the inner halo that several of us visual observers have reported. I'm glad to see it's not just a trick of the eye/brain's processing.
The outer halo, on the other hand, has not been visible to me (although it may have more to do with my humid skies and that dang moon than my aperture).
(Measuring against the background stars, your shot shows the inner halo at about 4', and the outer at about 9'.)
-- Jeff.
--------------------
Nikon 18x70s / UA Millennium Colorado:
Solarscope SF70 / TV Pronto / AP400QMD Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-100 / AP1200GTO Tak Mewlon 250 / AP600EGTO
|
plutarko
journeyman
Reged: 03/12/07
Posts: 9
|
|
Hi
Here is a 3 days size comparsion, all taken with the same equipment.
David
|
Previous
Index
Next
Threaded
[Re: 
Edit
Reply
Quote
