Galaxy NGC 7497 + Integrated Flux Nebula

NGC 7497
NGC 7497: Galaxy with molecular cloud MBM 54. Section of Sloan Digitized Sky Survey [147]

History

The galaxy NGC 7497 was discovered on 15 October 1784 by the German-British astronomer William Herschel with his 18.7 inch reflecting telescope. He cataloged it as III 203 and noted: «Very faint, considerably large, extended, 2' long.» [463] John Herschel observed it twice and noted for sweep 11 (7 October 1825): «Extremely faint; extended like the tail of a comet; little brighter in the middle.» On sweep 92 (26 August 1827) he noted: «very faint; much extended; position 45° north following to south preceding; 4' long, 1' broad.» [466]

Physical Properties

NGC 7497 is a barred spiral galaxy of morphological Type SBc. It is situated behind a filament of integrated flux nebula MBM 54. Integrated flux nebulae are high galactic latitude molecular clouds that are not illuminated by a single star but by the energy from all stars of The Milky Way, hence the term «integrated flux». Such nebulae are very faint. MBM 54 is part of a larger complex of molecular clouds, approximately 238 parsec away, slightly above the galactic plane. [37, 145, 271]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Designation NGC 7497
Type Gx (SBc)
Right Ascension (J2000.0) 23h 09m 03.5s
Declination (J2000.0) +18° 10' 39"
Diameter 4.4 × 1.7 arcmin
Photographic (blue) magnitude 13.0 mag
Visual magnitude 12.2 mag
Surface brightness 14.0 mag·arcmin-2
Position Angle 48°
Redshift (z) 0.005697
Distance derived from z 24.06 Mpc
Metric Distance 18.790 Mpc
Identification, Remarks WH III 203; h 2209; GC 4898; UGC 12392; MCG 3-59-2; CGCG 454-3; KUG 2306+179; IRAS 23065+1754

Finder Chart

The galaxy NGC 7497 is located in the constellation Pegasus. The best observation time is June to December, when it is highest at night.

Finder Chart Galaxy NGC 7497 + Integrated Flux Nebula
Galaxy NGC 7497 + Integrated Flux Nebula in constellation Pegasus. 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]

Objects Within a Radius of 15°

References