Jump to content


Photo

galaxies deep in Lynx

  • Please log in to reply
4 replies to this topic

#1 nytecam

nytecam

    Voyager 1

  • *****
  • Posts: 11551
  • Joined: 20 Aug 2005
  • Loc: London UK

Posted 04 March 2013 - 05:56 AM

Ending a session last Saturday night I spied, via Megastar, a Lynx gxy gp north of the PN NGC 2242 in Auriga. I ignored for now AGC 569 as too faint and went for a nearer gxy cluster slightly further north that included the field around NGC 2340, south around UGC 3725 with bright mag 6.9 red star and west of latter in PGC 20308 - Sloan DSS used to identify gxys - currently near zenith after dusk and good fields for larger scopes :grin:

#2 norden

norden

    Mariner 2

  • -----
  • Posts: 242
  • Joined: 08 Sep 2008
  • Loc: Norden

Posted 15 March 2013 - 03:16 PM

How long exposure have you used?

#3 nytecam

nytecam

    Voyager 1

  • *****
  • Posts: 11551
  • Joined: 20 Aug 2005
  • Loc: London UK

Posted 16 March 2013 - 03:30 AM

How long exposure have you used?

Thanks for your interest Norden ;) I regard myself as a DS observer using a cam due to poor eyes and skies. I use very brief snaps in astrophotography [AP] terms eg exp = 110 - 160 seconds as noted in header after "Lodestar-C". I omit the suffix 's' for "seconds" as in another forum where I sometime post I get stick from their AP guru stating that "any AP <20min exp in NOT AP" so they choose to be fooled into thinking the exp is in "minutes" which seem normal to him/them :p

#4 sgottlieb

sgottlieb

    Viking 1

  • *****
  • Posts: 972
  • Joined: 22 Jul 2007
  • Loc: SF Bay area

Posted 17 March 2013 - 01:30 AM

I went through NGC 2340 field a few years back -- very nice region. Here are notes on many of the objects in the image, though there are plenty of additional targets in the surrounding fields...

IC 458 = UGC 3713 = MCG +08-13-085 = PGC 20306
07 10 34.3 +50 07 06
V = 13.5; Size 0.9'x0.4'; Surf Br = 12.3; PA = 175d

18" (12/18/06): fairly faint, small, elongated 3:2 N-S, 0.6'x0.4', weak concentration to center. A mag 12.5 star is just off the south edge 0.6' from center. In a small group with NGC 2340, IC 458, IC 461, IC 464, IC 465.
************************************************************

IC 459 = CGCG 234-082 = PGC 20311
07 10 38.7 +50 10 38
Size 0.5'x0.4'

18" (12/18/06): extremely faint, very small, round, 20" diameter, low surface brightness, no concentration. Located 5' due west of NGC 2340 in the core of the cluster and 3.6' N of IC 458.
************************************************************

IC 460 = MCG +08-13-089 = CGCG 234-084 = PGC 20318
07 10 44.3 +50 12 09
V = 14.3; Size 0.8'x0.5'

18" (12/18/06): extremely faint galaxy in the core of the NGC 2340 group. Just visible with averted vision and concentration as a 10" knot just off the NE side of a mag 13 star [only 18" separation]. This star forms a pair with another mag 13 star 44" NW. Located 4.5' WNW of NGC 2340 and 1.8' NNE of IC 459.
************************************************************

IC 461 = MCG +08-13-088 = CGCG 234-083 = PGC 20319
07 10 45.0 +50 04 53
Size 0.6'x0.35'; PA = 35d

18" (12/18/06): extremely faint, very small, sightly elongated SW-NE, 0.3'x0.2'. This small galaxy is just preceding a 1.5' string of 3 mag 12-13 stars angling from SW to NE and 2.8' SE of IC 458 in the NGC 2340 group (second faintest of 7 in the field at 280x).
************************************************************

IC 464 = CGCG 234-087 = MCG +08-13-092 = PGC 20332
07 11 04.8 +50 08 13
V = 13.8; Size 0.8'x0.4'; Surf Br = 12.4; PA = 60d

18" (12/18/06): fairly faint, fairly small, oval 3:2 SW-NE, 0.6'x0.35', even concentration but with no defined core of nucleus. Located 2.5' SSW of NGC 2340 in a rich group of galaxies with NGC 2350, IC 458, IC 459, IC 460, IC 461 and IC 465 in the same 280x field!
************************************************************

NGC 2340 = UGC 3720 = MCG +08-13-096 = CGCG 234-091 = PGC 20338
07 11 10.8 +50 10 28
V = 11.7; Size 1.8'x1.2'; Surf Br = 12.6; PA = 80d

18" (12/18/06): moderately bright, moderately large, oval 3:2 WSW-ENE, 1.5'x1.0', large bright core increases gradually to the center. A mag 12 star lies 1.7' NW. Brightest in a group of 7 galaxies (5 IC's) incuding IC 464 2.5' SSW. Beyond IC 464 a string of stars continues to the SSW.
************************************************************

NGC 2334 = IC 465 = MCG +08-13-098 = CGCG 234-095 = PGC 20357
07 11 33.6 +50 14 53
V = 13.6; Size 0.9'x0.7'; Surf Br = 12.9; PA = 70d

18" (12/18/06): fairly faint, fairly small, slightly elongated, 0.5'x0.4', gradually increases to a very small, brighter core. Furthest NE in a group of 7 galaxies in the field and 5.8' NE of the brightest member, NGC 2340. This galaxy is generally identified as IC 465 as the NGC identification is questionable.

Discovered by Bindon Stoney at Birr Castle on 2 Jan 1851. There were 3 observations of the NGC 2332/NGC 2340 field and a total of 9 objects were found and sketched (3 in the 1880 publication) but the 1861 publication only included the comment "several knots around" for NGC 2332. So, JH decided to include only one new entry in the GC (1492), which Dreyer assigned to either NGC 2330 and NGC 2334 (with question marks). Bigourdan examined the field on 16 Nov 1885 and found the IC objects but unfortunately his complete observations were not published until 1907, except for NGC 2330 (list I-25) and NGC 2334 (list I-26) which refer to stars! So, Dreyer's position for NGC 2234 refers to a blank piece of sky. Reinmuth couldn't find NGC 2334 and noted "in Dreyer's place not found, = IC 464?"

Kobold's position for IC 465 from AN 3184 is an exact match with MCG +08-13-098 and this galaxy is definitely shown on the Birr Castle sketch of the cluster. The question remains if this is the galaxy Dreyer meant as NGC 2334. Dreyer credits both Rosse and d'Arrest in the IC, so this seems probable. Listed as nonexistent in RNGC.
************************************************************

UGC 3725 = MCG +08-13-101 = CGCG 234-097 = PGC 20364
07 11 41.8 +49 52 00
V = 13.0; Size 1.4'x0.8'; Surf Br = 13.1; PA = 142d

18" (12/18/06): fairly faint, fairly small, slightly elongated, 0.5'x0.4' (viewed core only), weak concentration. A mag 13.5 star is attached at the SW side [17" from the center]. Located 5' NW of mag 6.8 HD 54590 and 6.5' ESE of a wide, bright double star (Es 2622). Picked up while viewing the NGC 2340 group ~20' NNW.

#5 nytecam

nytecam

    Voyager 1

  • *****
  • Posts: 11551
  • Joined: 20 Aug 2005
  • Loc: London UK

Posted 17 March 2013 - 01:41 PM

Thanks Steve - remarkable observations and notes :bow: that I'm slowly reading through against Megastar and my field shots above. Thanks again :grin:






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics