NGC 1242

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Galaxy
NGC 1242
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HST image of NGC 1241 (center) together with NGC 1242 (top left) [1]
HST image of NGC 1241 (center) together with NGC 1242 (top left)
AladinLite
Constellation Eridanus
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 03 h 11 m 19.3 s
declination -08 ° 54 ′ 09 ″
Appearance
Morphological type SB (rs) c:  
Brightness  (visual) 13.7 mag
Brightness  (B-band) 14.4 mag
Angular expansion 1.2 ′ × 0.6 ′
Position angle 130 °
Surface brightness 13.2 mag / arcmin²
Physical data
Affiliation NGC 1241 group
LGG 84  
Redshift 0.013369 ± 0.000017  
Radial velocity (4008 ± 5) km / s  
Stroke distance
v rad  / H 0 		(177 ± 12)  ·  10 6  ly
(54.4 ± 3.8)  Mpc 
diameter 65,000 ly
history
discovery Wilhelm Herschel
Discovery date December 15, 1786
Catalog names
NGC  1242 • PGC  11892 • MCG  -02-09-012 • Arp  304 • VV  334b • GC  655 • H  III 591 • GALEX ASC J031119.31-085406.6 • AGC 430083 • Holm 68C

NGC 1242 is a barred spiral galaxy of the Hubble type SBc in the constellation Eridanus in the southern sky . It is estimated to be 177 million light-years from the Milky Way and about 81,000 light-years across. Together with NGC 1241 , it forms an interacting pair of galaxies. Together with NGC 1247 , PGC 11824 and PGC 11937 it also forms the NGC 1241 group .

Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This pair of galaxies belongs to the class Unclassified double galaxies .

In the same area of ​​the sky is u. a. the galaxy NGC 1237 .

The object was discovered on December 15, 1786 by the astronomer Wilhelm Herschel .

literature

  • Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7

Web links

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS : NGC 1242
  4. ^ VizieR
  5. ^ Díaz et al .: "Circumnuclear Structures in the Interacting Seyfert Galaxy NGC 1241: Kinematics and Optical / Infrared Morphology"; in: The Astrophysical Journal, Vol. 597, Issue 2, pp. 860 to 869, bibcode : 2003ApJ ... 597..860D (English)
  6. ↑ Seligman