NGC 925

NGC 925
NGC 925 imaged with the 32 inch telescope at Mount Lemmon Observatory
Observation data (J2000 epoch)
ConstellationTriangulum
Right ascension02h 27m 16.913s[1]
Declination+33° 34′ 43.97″[1]
Redshift553 ± 3 km/s[2]
Heliocentric radial velocity564[3] km/s
Distance30.3 ± 2.3 million light years (9.29 ± 0.69 Mpc)[4]
Group or clusterNGC 1023 Group[5]
Apparent magnitude (V)10.7[2]
Characteristics
TypeSB(s)d[3]
Apparent size (V)10′.5 × 5′.9[2]
Other designations
IRAS 02243+3321, UGC 1913, MCG +05-06-045, PGC 9332, CGCG 504-085 [2]

NGC 925 is a barred spiral galaxy located about 30[4] million light-years away in the constellation Triangulum. German-British astronomer William Herschel discovered this galaxy on 13 September 1784.[6]

The morphological classification of this galaxy is SB(s)d,[3] indicating that it has a bar structure and loosely wound spiral arms with no ring.[7] The spiral arm to the south is stronger than the northern arm, with the latter appearing flocculent and less coherent. The bar is offset from the center of the galaxy and is the site of star formation all along its length. Both of these morphological traits—a dominant spiral arm and the offset bar—are typically characteristics of a Magellanic spiral galaxy.[8] The galaxy is inclined at an angle of 55° to the line of sight along a position angle of 102°.[3]

The NGC 925 is a member of the NGC 1023 Group, a nearby, gravitationally-bound group of galaxies associated with NGC 1023.[5] However, the nearest member lies at least 650,000 ly (200,000 pc) distant from NGC 925. There is a 10 million solar mass (M☉) cloud of neutral hydrogen attached to NGC 925 by a streamer. It is uncertain whether this is a satellite dwarf galaxy, the remnant of a past tidal interaction, or a cloud of primordial gas.[9]

Although no supernovae have been observed in NGC 925 yet, a luminous red nova, designated AT 2023nzt (type LRN, mag. 19), was discovered on 26 July 2023.[10]

  1. ^ a b Cite error: The named reference ApJ131_1163 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference ned was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Martin1994 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Silbermann1996 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Tully1980 was invoked but never defined (see the help page).
  6. ^ Seligman, Courtney. "NGC 925". Celestial Atlas. Retrieved 26 August 2024.
  7. ^ Cite error: The named reference Buta2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Pisano2000 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Pisano2007 was invoked but never defined (see the help page).
  10. ^ Transient Name Server entry for AT 2023nzt. Retrieved 25 October 2023.