NGC 7023 (vdB 139, LBN 487) / Cr 427 (Lund 973) Bright Nebula / Open Cluster in Cepheus

Located at: RA 21 hours 01 minutes 36 seconds, Dec +68 degrees 10 minutes 00 seconds

Size: 14' (18') / 4.0' Magnitude: 7.1 / 13.8 Class: Reflection / IV 1 p n

North is up

West to the right

Telescope:

8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56

Image:

Lumicon Deep Sky filter, 270 minutes (27 x 10 minute subs), 09/14/15/2007

Processing:

CCDStack 1.3, Photoshop 7.0

Location:

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

Notes: NGC 7023 is the reflection nebula around the 7.4 magnitude star SAO 19158, centered in this image. Some catalogues list NGC 7023 as an open cluster ...

"Star Clusters", by Brent Archinal and Steven Hynes, says in the Comments: "This is a reflection nebula with the star cluster Collinder 427 (Cr 427) involved on its west side".  "Star Clusters" lists the nebulosity as 18 arc minutes in size.

See this image from the CDS. In the broader field around NGC 7023 is a very dusty region, well shown in this wide field color image by Bernhard Hubl. See my 14.5" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7023
NGC 7023 = LBN 487 = Cr 429
21 01 36 +68 10
Size 18x18

17.5" (8/13/88): very prominent unusual nebulosity surrounding mag 7.4 SAO 
19158.  A dark lane oriented SSW-NNE is following the bright star.  Nebulosity 
may extend to a star 3' SSE which has a halo.

13" (9/11/82): bright, large nebulosity surrounding a mag 7 star.  There is a 
sharp light cut-off on the E side near the bright star, although nebulosity 
extends beyond.

8" (8/28/81): nebulosity extends south of the mag 7.5 star with averted vision 
using 100-125x. A very faint star is at the south edge.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 7023
NGC 7023 is an impressive diffuse nebula in Cygnus, made more so by the 
obscuring dark cloud surrounding it.  It makes a fine sight in a six-inch
which will not see deeply enough to pick up what faint stars there are 
scattered around the nebula -- it appears to stand alone in a large void in 
the sky.

There is no difficulty with the identification, though I am curious as to why
JH did not pick it up.  The NGC entry is based on a single observation by his 
father. - Dr. Harold G. Corwin, Jr.