The recent blush of media interest in the R136 stars in the Tarantula Nebula sparked me into action to find precise positions for its components. The R136...
23003
Steve Gottlieb
steven_gottlieb
Aug 5, 2010 5:42 pm
In Paul Murdin and David Allen's "Catalogue of the Universe" (1979) there is an image taken with the UK Schmidt telescope of an apparently interacting pair of...
23004
wild_duck11
Aug 5, 2010 6:23 pm
Hi Steve, I checked the Glossary but it's of little help. All it says is "Fly's Wing Galaxy. Gx CU, page 29" The CU refers to Catalogue of the Universe so...
23005
OWEN BRAZELL
obrazell
Aug 5, 2010 6:24 pm
Steve it appears to be NGC 5152/5153 in Hydra. It is also in Arp and Mador interacting galaxies as AM 1325-292. There is no further information in the book ...
23006
Sue French
susancfrench
Aug 5, 2010 7:53 pm
Steve, The image in the book is labeled UKSTU, and the Acknowledgements say that those images were prepared mostly by David Malin from plates obtained with the...
23007
Steve Gottlieb
steven_gottlieb
Aug 5, 2010 10:51 pm
You got it, Owen! The image in the book is rotated so west is at the top, but the three galaxies are definitely N5150 and the close pair N5152/5253. There's...
23008
cpamontalvo
Aug 8, 2010 7:14 pm
Dear Sue, Just to bring to your attention, I looked for Shane 1 (PK 13+32.1) in SkyMap 11 and I found it in a different position, 33' to the north of your...
23009
Sue French
susancfrench
Aug 8, 2010 9:03 pm
Celso, Shane 1 is the non-existent "star" GSC 5034-397. Here are the data from MegaStar. Shane 1 PK 13+32.1 PNG 13.3+32.7 Planetary Nebula RA: 16h 21.075m ...
23010
Brian Skiff
bas@...
Aug 8, 2010 9:58 pm
... People wondered when the USNO-x.x star catalogues started coming out why Dave Monet gave the Declinations in the source files as South Polar Distance. It...
23011
Sue French
susancfrench
Aug 8, 2010 11:23 pm
That should have said: 1.8' away ... From: amastro@yahoogroups.com [mailto:amastro@yahoogroups.com] On Behalf Of Sue French Sent: Sunday, August 08, 2010 5:03...
23012
cpamontalvo
Aug 9, 2010 7:26 pm
Sue, I was sure it was a mistake in SkyMap (maybe from Tycho). The photo in S&T would have dissipated any doubt. For my observing session I created a Quick...
23013
Brian Skiff
bas@...
Aug 18, 2010 4:17 am
On tonight's astro-ph preprint server is a useful paper showing new precise centers for some galactic globular clusters: http://arxiv.org/abs/1008.2755 The ACS...
23014
the beckster
beckyramotowski
Aug 18, 2010 6:25 pm
Hi all, Does anyone have any contacts in the Alice Springs area for astronomy? I'm planning a visit and would like some input for a society or person that...
23015
gnowellsct
Aug 18, 2010 9:51 pm
We've had some often-cloudy-with-suckerholes nights recently where I've been messing around with minimum magnifications for splitting the double double. In the...
23016
Brian Skiff
bas@...
Aug 18, 2010 10:06 pm
This sort of thing is tied with both the physics of the diffraction pattern and raw signal-to-noise, as well as the fuzzier physiological side of viewing. So...
23017
Zarenski, Edward R
edzaren
Aug 18, 2010 11:13 pm
hundreds of observations of this pair of pairs are recorded in the anals of the Cloudy Nights double star forum. Some of my best small scope sightings 5" C5...
23018
pensack1
Aug 19, 2010 5:12 am
With my 12.5": 59X (my lowest power). With my 5" Mak: 64X (its lowest power). Both observations in good seeing (though not superb). In the 5", the closer...
23019
Nils Olof Carlin
nilsolofcarlin
Aug 19, 2010 7:52 am
Applying the Dawes' limit to the southern pair of appr. equal magnitudes and a separation of 2.35 arcsec would give a minimum of just under 2 inches aperture. ...
23020
Sue French
susancfrench
Aug 19, 2010 3:29 pm
Greg, On a night of good seeing, I can cleanly split both through my 105mm Traveler at 47x (13mm Nagler). On a night of average seeing, I can split them at...
23021
pensack1
Aug 19, 2010 7:36 pm
Nils, My reasoning is that an apparent separation of about 1 minute represents the limit of superb vision. It may, in fact, be better than that, since some...
23022
gnowellsct
Aug 19, 2010 7:37 pm
Sue: I haven't tried recently in my 102mm. You're suggesting that on a great night might be do-able at lower powers than what I've done so far. Hmmmm. What...
23023
Zarenski, Edward R
edzaren
Aug 19, 2010 8:16 pm
I reviewed the two threads records of Lowest Power to Observe E1E2 Lyra threads on Cloudy Nights. There were about 60 or 70 observers reporting in those two...
23024
Sue French
susancfrench
Aug 19, 2010 11:24 pm
Greg, Tuesday night, the seeing was only fair to poor. The seeing was fair high in the sky when I was using 102x with the 130mm to show the Double-Double to...
23025
jimcoble2000
Aug 21, 2010 3:21 pm
Sorry to report that it appears that Jack Horkheimer has passed away. http://www.miamiherald.com/2010/08/20/1785361/star-gazer-host-jack-horkheimer.html...
23026
pensack1
Aug 23, 2010 12:31 am
Ed, When the seeing is really good (say 0.7" or less), the closer pair of epsilon Lyrae appears cleanly split at 59X in my 12.5". Most of the time the two...
23027
Brian Skiff
bas@...
Aug 23, 2010 3:47 am
On tonight's astro-ph preprint server is the latest issue of the newsletter from the Australian Astronomical Observatory (formerly AAO, but for...
23028
Nils Olof Carlin
nilsolofcarlin
Aug 23, 2010 8:27 pm
With a 12.5" aperture, the angular diameter of the Airy disk is some 0.44 arcseconds - way less than the 2.35 (IIRC) arcsec separation of the closest pair....
23029
Nils Olof Carlin
nilsolofcarlin
Aug 23, 2010 9:29 pm
... What I calculated was the radius, instead of the diameter, of the Airy disk. Still, the two disks would be well separated in the focal plane, even if this...
23030
George Biddleairy
jkwaldip
Aug 24, 2010 9:16 pm
During the summer of 2007, I noticed an anomalous 'asymmetrical halo' around 4 Cygni while observing with my 10 inch Dobsonian in the Santa Cruz mountains...
23031
Brian Skiff
bas@...
Aug 24, 2010 9:48 pm
The nebula is readily visible, though not obvious, on the POSS-I/II scans. Since the star 4 Cyg is a late-B star (at about 200 parsecs if the revised...
