NGC 3172

NGC 3172 (also known as Polarissima Borealis[1]) is a lenticular galaxy located in the constellation Ursa Minor. It is the closest NGC object to the north celestial pole.[1] Discovered by John Herschel in 1831, it is about 285 million light-years away and about 85 thousand light-years across.[3]

NGC 3172
Pan-STARRS image of NGC 3172
Observation data (J2000 epoch)
ConstellationUrsa Minor
Right ascension11h 47m 11.928s[1]
Declination+89° 05′ 35.77″[1]
Apparent magnitude (V)14.9[1]
Characteristics
TypeS0[2]
Apparent size (V)0.92′ × 0.79′[1]
Notable featuresClosest NGC object to the north celestial pole.
Other designations
NGC 3172, PGC 36847, MCG 15-1-11

Two supernovae have been observed in NGC 3172. SN 2010af (type Ia, mag. 17.2), was discovered on 4 March, 2010.[4] SN 2017gla (type Ia, mag. 16), was discovered on 1 September, 2017.[5]

See also
  • NGC 2573 - the closest NGC object to the south celestial pole.

References
  1. SIMBAD:%20NGC%203054%20--%20Galaxy "NGC 3172". sim-id. Retrieved 2020-05-29.
  2. "Search specification: NGC 3172". HyperLeda. Université Claude Bernard Lyon 1. Retrieved 2021-02-24.
  3. "New General Catalog Objects: NGC 3150 - 3199". cseligman.com. Retrieved 2020-05-30.
  4. "Bright Supernovae - 2010". www.rochesterastronomy.org. Retrieved 2020-05-30.
  5. Transient Name Server entry for SN 2017gla. Retrieved 24 March 2023.


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