NGC 7479, Propeller Galaxy

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

History

The galaxy NGC 7479 was discovered on October 19, 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 [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]

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
DesignationsPGC 70419: NGC 7479, UGC 12343, MCG 2-58-60, CGCG 430-58, IRAS 23024+1203, KARA 1004
Right Ascension (J2000.0)23h 04m 57.0s
Declination (J2000.0)+12° 19' 18"
Morphological TypeSB
Dimensions4.0' x 3.1'
Visual Magnitude11.6 mag
Radial Velocity (HRV)2378 km/s
Position Angle25°

Finder Chart

The galaxy NGC 7479 is located in the constellation Pegasus. The best observation time is June to November, when it is highest at night.

Chart NGC 7479
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

Visual Observation

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

References

144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); cdsarc.unistra.fr/viz-bin/cat/VII/119 (2021-02-18)
145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
440Spiral spins both ways; esahubble.org/images/potw1125a (2021-10-03)
464«Catalogue of a second thousand of new nebulae and clusters of stars; with a few introductory remarks on the construction of the heavens» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1789; DOI:10.1098/rstl.1789.0021