Galaxy NGC 7640

NGC 7640: Galaxie in Andromeda; 500 mm Cassegrain 5800mm f11.4; SBIG STL11K; 90-10-10-10 min LRGB; Bernese Highlands; © 2005 Radek Chromik


The galaxy NGC 7640 was discovered in 1784 with his home-made 18.7 inch f/12.8 reflecting telescope in Slough, England. On 17th October 1786 he cataloged it as II 600. [277, 464]

Physical Properties

Distance measurements of this SBc-type galaxy range from 8.4 Mpc to 11.9 Mpc. [145] There are indications, that the increased star formation is due to a recent interaction with a smaller galaxy. [431]

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
DesignationNGC 7640
TypeGx (SBc)
Right Ascension (J2000.0)23h 22m 06.6s
Declination (J2000.0)+40° 50' 42"
Diameter10.5 × 1.8 arcmin
Photographic (blue) magnitude11.9 mag
Visual magnitude11.3 mag
Surface brightness14.5 mag·arcmin-2
Position Angle167°
Distance derived from z5.20 Mpc
Metric Distance8.510 Mpc
Dreyer DescriptioncF, L, mE 164°, vlbM, r
Identification, RemarksUGC 12554, MCG 7-48-2, CGCG 532-17, CGCG 533-1, IRAS 23197+4034

Finder Chart

The galaxy NGC 7640 is located in the constellation Andromeda. The best observation time is July to February, when it is highest at night.

Finder Chart Galaxy NGC 7640
Galaxy NGC 7640 in constellation Andromeda. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Visual Observation

Description pending ...

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