NGC 789
| NGC 789 | |
|---|---|
 NGC 789 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Triangulum |
| Right ascension | 02h 02m 26.0531s[1] |
| Declination | +32° 04′ 20.225″[1] |
| Redshift | 0.017569±0.0000270[1] |
| Heliocentric radial velocity | 5,267±8 km/s[1] |
| Distance | 241.2 ± 16.9 Mly (73.94 ± 5.19 Mpc)[1] |
| Group or cluster | NGC 777 group (LGG 42) |
| Apparent magnitude (V) | 14.40[1] |
| Characteristics | |
| Type | S[1] |
| Size | ~83,500 ly (25.61 kpc) (estimated)[1] |
| Apparent size (V) | 0.6′ × 0.4′[1] |
| Other designations | |
| IRAS 01595+3149, 2MASX J02022599+3204199, UGC 1520, MCG +05-05-047, PGC 7760, CGCG 503-077[1] | |
NGC 789 is a spiral galaxy in the constellation of Triangulum. Its velocity with respect to the cosmic microwave background is 5,013±20 km/s, which corresponds to a Hubble distance of 241.2 ± 16.9 Mly (73.94 ± 5.19 Mpc).[1] It was discovered by German astronomer Heinrich Louis d'Arrest on 24 August 1865.[2]
NGC 789 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[3][4]
NGC 777 group
[edit]NGC 789 is a member of the NGC 777 Group (also known as LGG 42). There are 13 galaxies in the group, including NGC 750, NGC 751, NGC 761, NGC 777, NGC 783, and NGC 785.[5][6]
Supernovae
[edit]Two supernovae have been observed in NGC 789:
- SN 2004ad (type unknown, mag. 17.0) was discovered by British amateur astronomer Mark Armstrong on 1 March 2004.[7][8]
- SN 2026ovz (Type II, mag. 16.1125) was discovered by the Zwicky Transient Facility on 10 June 2026.[9]
See also
[edit]References
[edit]- 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 789". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 3 July 2026.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 789". Celestial Atlas. Retrieved 3 July 2026.
- ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D.; Davies, R. I.; Hönig, S. F.; Ricci, C.; Rosario, D. J.; Salvato, M.; Shankar, F.; Stern, D. (2020). "Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC". Monthly Notices of the Royal Astronomical Society. 494 (2): 1784. arXiv:2003.05959. Bibcode:2020MNRAS.494.1784A. doi:10.1093/mnras/staa766.
- ↑ "NGC 789". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 July 2026.
- ↑ Garcia, A. M. (1 July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G.
- ↑ "LGG 42". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 July 2026.
- ↑ Armstrong, M. (2004). "Supernovae 2004ac and 2004ad". International Astronomical Union Circular (8296): 1. Bibcode:2004IAUC.8296....1A.
- ↑ "SN 2004ad". Transient Name Server. IAU. Retrieved 3 July 2026.
- ↑ "SN 2026ovz". Transient Name Server. IAU. Retrieved 3 July 2026.
External links
[edit]
Media related to NGC 789 at Wikimedia Commons- NGC 789 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
