NGC 7423 (Berkeley 57, Lund 1026) Open Cluster in Cepheus

Located at: RA 22 hours 55 minutes 08 seconds, Dec +57 degrees 05 minutes 46 seconds

Size: 5.0' Magnitude: 15.0 Class: II 2 m

North is up

West to the right


8" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56


Lumicon Red filter, 510 minutes (51 x 10 minute subs), 09/17/18/2010; 2.8-3.6 FWHM per CCDStack


CCDStack 2.11.3874.21660, Photoshop 7.0


 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: There are (at least) two non-stellar objects in this field, in addition to the open cluster. Just to the NNE (above left) of NGC 7423 is IRAS 22534+5653, and further to the east is PK 107-2.1 (Minkowski 1-80), which at this focal length (1000 mm) looks like a star. See this marked image. See the 14.5" version.

From the NGC / IC Project:

No Contemporary Visual Observation(s) listed ...

Historical Research Notes / Correction for NGC 7423
NGC 7423 is a nice, compressed cluster at the NGC position.  It sits between
two brighter stars, and would probably be an interesting, if faint, object at 
the eyepiece.

JH was not sure in his 1833 catalogue if this was his father's III 745 or not.
When he compiled the GC, however, he adopted his own position and his father's
description.  This is actually the best combination as both are correct.  WH's
position, however, is a minute of time east of the JH's position.  Dreyer 
noticed this when he published all of WH's papers in 1912, and wrote a short
note about it.  In that note, Dreyer also mentions "In the sweep a star 6 mag
= +56 2923 is 3m 41s f, 10' s."  Doing the math from WH's reference star
(Delta Cephei) for III 745, the BD star ends up close to its true position --
but III 745 is stubbornly 1 minute of time off.

Curiously, RNGC calls the cluster non-existent though it is clear on the POSS, 
and is included in the cluster catalogues as Berkeley 57 (that identity was
apparently first noticed by Alister Ling in 1985).  SIMBAD mistakenly equates
the cluster with a faint planetary (an infrared source) a few arcmin to the
northeast. - Dr. Harold G. Corwin, Jr.