Propeller Galaxy (NGC 7479)

NGC 7479
NGC 7479: Galaxy in Pegasus; 500 mm Cassegrain f/7.2; SBIG STL11K; 120-30-30-30 min LRGB; Bernese Highlands; © 2011 Radek Chromik [32]

History

The galaxy NGC 7479 was discovered on 19 October 1784 by the German-British astronomer William Herschel with his 18.7 inch reflecting telescope. He cataloged it as I 55 and noted: «Considerably bright, much extended in direction meridian, gradually brighter in the middle, 4' long 2' broad.» [464]

Physical Properties

NGC 7479
NGC 7479: Image taken with Hubble Space Telescope. © ESA/Hubble & NASA [440]

This is a Seyfert 2 galaxy at a distance of 30 Mpc to 36 Mpc. [145] The arms of this barred spiral galaxy spiral counterclockwise like a mirror-inverted «S». In the radio wave range, the galaxy rotates in the opposite direction. A jet of radiation curves in the opposite direction to the stars and dust in its arms. The radio jet in NGC 7479 is thought to have gone into its bizarre reverse spin after a merger with another galaxy. Star formation has been reignited as a result and the galaxy is experiencing starburst activity with many bright young stars in the spiral arms and disk. [440]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Designation NGC 7479
Type Gx (SBc)
Right Ascension (J2000.0) 23h 04m 56.7s
Declination (J2000.0) +12° 19' 20"
Diameter 4 × 3.1 arcmin
Photographic (blue) magnitude 11.6 mag
Visual magnitude 10.9 mag
Surface brightness 13.5 mag·arcmin-2
Position Angle 25°
Redshift (z) 0.007942
Distance derived from z 33.55 Mpc
Metric Distance 33.850 Mpc
Identification, Remarks WH I 55; h 2205; GC 4892; UGC 12343; MCG 2-58-60; CGCG 430-58; IRAS 23024+1203; KARA 1004; KUG 2302+120

Finder Chart

The galaxy NGC 7479 is located in the constellation Pegasus and very easy to find: Exaxtly 3° south of the star Markab. The best observation time is June to December, when it is highest at night.

Finder Chart Propeller Galaxy (NGC 7479)
Propeller Galaxy (NGC 7479) 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]

Visual Observation

300 mm Aperture: Only the elongated bar of the barred spiral galaxy was visible, which appeared somewhat brighter at the northern end. I could not see anything of the spirals. However, the transparency of the air was not very good either, despite the high altitude on the Titlis. — 300 mm f/4 Popp Newton, Titlis 3020 m. a.s.l., SQM 21.09, 29 October 2022, 22:10, Bernd Nies

320 mm Aperture: Barred spiral galaxy NGC 7479 shows one brighter end of only two spiral arms. — 12.5" Ninja-Dobson f/4.5, Tele Vue Radian 8 mm (181x), 17.-18. Oktober 2001, Hohnegg CH, 1460 m ü. M., Eduard von Bergen

Objects Within a Radius of 20°

References