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
| Telescope: |
8" f5 Newtonian reflector |
| Camera: |
ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56 |
| Image: |
Lumicon Red filter, 510 minutes (51 x 10 minute subs), 09/17/18/2010; 2.8-3.6 FWHM per CCDStack |
| Processing: |
CCDStack 2.11.3874.21660, Photoshop 7.0 |
| Location: |
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 NNW (above left) the open
cluster is
IRAS 22534+5653, and further to
the east is PK107-2.1 (Minkowski
1-80), which at this focal length (1000 mm) looks like a star. See
this marked image. From the NGC / IC Project: No Observations listed ... Historical Research Notes / Correction for NGC 7423NGC 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. |
