NGC 78

NGC 78 is a pair of galaxies in the constellation Pisces.[2] NGC 78A, which is the more southern galaxy, is a barred spiral galaxy.[2] NGC 78B, which is the more northern galaxy, is an elliptical galaxy.[4] Although the designations NGC 78A and 78B are used today, the designation NGC 78 was formerly used mainly for the northern galaxy.[5]

NGC 78
SDSS image of NGC 78A (bottom right) and 78B (top left)
Observation data (J2000 epoch)
ConstellationPisces
Right ascension 00h 20m 27.482s[1]
Declination+00° 50′ 00.96″[1]
Redshift0.018283[2]
Helio radial velocity5079 km/s[2]
Apparent magnitude (B)14.5[3]
Characteristics
TypeSB0/a?(r)[2]
Size84,100 ly (25,790 pc)[2][note 1]
Apparent size (V)1.3′ × 0.897′[2][note 1]
Other designations
NGC 78A: UGC 193, MGC+00-02-004, PGC 1306[3]
NGC 78B: UGC 194, MGC+00-02-005, PGC 1309[4]

NGC 78 was discovered no later than 1876 by Carl Frederick Pechüle.[5] It was described as "very faint, small, round" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[5] Because the two galaxies have different recessional velocities, the two galaxies are most likely not interacting.[5]

References
  1. Skrutskie, M. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.
  2. "NED results for object NGC 0078A". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 6 September 2017.
  3. "NGC 78A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 September 2017.
  4. "NGC 78B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 September 2017.
  5. "New General Catalog Objects: NGC 50 - 99". cseligman.com. Retrieved 6 September 2017.

Notes
  1. POSS1 103a-O values used.
  • Media related to NGC 78 at Wikimedia Commons


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