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]
DesignationNGC 7497
TypeGx (SBc)
Right Ascension (J2000.0)23h 09m 03.5s
Declination (J2000.0)+18° 10' 39"
Diameter4.4 × 1.7 arcmin
Photographic (blue) magnitude13.0 mag
Visual magnitude12.2 mag
Surface brightness14.0 mag·arcmin-2
Position Angle48°
Redshift (z)0.005697
Distance derived from z24.06 Mpc
Metric Distance18.790 Mpc
Dreyer DescriptionvF, L, pmE 45°, lbM
Identification, RemarksWH 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. On 9 September it is in opposition to the Sun and crosses the meridian at local midnight. The best observation time is January to December, when it is highest at night.

Pegasus: Galaxy NGC 7497 & Integrated Flux Nebula
Finder Chart Galaxy NGC 7497 & Integrated Flux Nebula
02:15
09:06 | 61.5°
15:58
Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. Times are shown for timezone UTC, Latitude 46.7996°, Longitude 8.23225°, Horizon height 5°, Date 2025-04-14. [149, 160]

Objects Within a Radius of 20°

References