NGC 2355 (Lund 311, Cr 133) Open cluster in Gemini
Located at: RA 07 hours 17 minutes 00 seconds, Dec +13 degrees 45 minutes 00 seconds
Size: 9.0' (8.0') Magnitude: 9.7 Class: II 2 m
North is up
West to the right
14.5" f5 Newtonian reflector
ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56
Lumicon Red filter, 200 minutes (20 x 10 minute subs), 04/3/2015; seeing 2.7-5.0 FWHM per CCDStack
CCDStack 2.89.5560.25580, Photoshop CS5.1
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)
|Notes:||I had wanted to start imaging a galaxy rising in the north (keeping
away from the full moon), but my neighbor's patio lights were on, and
shined into my tube (creating an unacceptable gradient). So I tried
imaging a one night object that was away from the moon. NGC 2355 was
already past the meridian, so I had to image low in the west (last sub
seeing was ~5 arc seconds). See the 8" image.
According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 8.0 arc minutes.
From the NGC / IC Project:
Contemporary Visual Observation(s) for NGC 2355
NGC 2355 = Cr 133 = Mel 63 = OCL-496 = N2356? 07 16 59 +13 45.0 Size 9 13.1": about 50 stars down to mag 14 in a 8'x5' group elongated N-S including a mag 10 star at the SE edge. Rich, fairly compact, a number of stars are arranged in lanes. Located about 7' SW of mag 8.0 SAO 95722. - by Steve GottliebHistorical Research Notes / Correction for NGC 2355
NGC 2356 is most likely NGC 2355 with a 10 arcmin error in declination. There is no other group of stars in the area that fits WH's description "A pretty rich and compressed cluster of stars" as well. JH did not see NGC 2356, but found NGC 2355 easily. Note, too, that WH's position for N2355 is about 1m 40s too far west; Dreyer discusses the circumstances of WH's observation of N2355 a bit more in his 1912 edition of WH's papers. - Dr. Harold G. Corwin, Jr.