NGC 6993
| NGC 6993 | |
|---|---|
 NGC 6993 imaged by Pan-STARRS | |
| Observation data (J2000 epoch) | |
| Constellation | Capricornus |
| Right ascension | 20h 53m 54.0499s[1] |
| Declination | −25° 28′ 20.920″[1] |
| Redshift | 0.020277±0.00000900[1] |
| Heliocentric radial velocity | 1,733±9 km/s[1] |
| Distance | 280.2 ± 19.6 Mly (85.91 ± 6.02 Mpc)[1] |
| Apparent magnitude (V) | 14.5[1] |
| Characteristics | |
| Type | SB(r)cd[1] |
| Size | ~204,500 ly (62.69 kpc) (estimated)[1] |
| Apparent size (V) | 1.3′ × 1.1′[1] |
| Other designations | |
| ESO 529- G 011, IRAS 20509-2539, 2MASX J20535406-2528210, MCG -04-49-007, PGC 65671[1] | |
NGC 6993 is a large barred spiral galaxy in the constellation of Capricornus. Its velocity with respect to the cosmic microwave background is 5,824±18 km/s, which corresponds to a Hubble distance of 280.2 ± 19.6 Mly (85.91 ± 6.02 Mpc).[1] It was discovered by American astronomer Francis Leavenworth on 8 July 1885.[2]
NGC 6993 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]
Galaxy group
[edit]NGC 6993 is a member of a small group of three galaxies known as [CHM2007] LDC 1426. The other two galaxies are ESO 529-5 and ESO 529-10.[5][6]
Supernova
[edit]One Supernova has been observed in NGC 6993:
- SN 2020pvb (Type IIn, mag. 21.04) was discovered by Pan-STARRS on 18 July 2020.[7] This supernova was initially detected during a pre-explosion outburst, with the actual supernova occurring several weeks later.[8] Spectral signatures and a plateau-like light curve led scientists to classify SN 2020pvb as Type IIn-P, similar to SN 1994W, SN 2009kn, and SN 2011ht.[8]
Image gallery
[edit]
NGC 6993 imaged by the Hubble Space Telescope
See also
[edit]References
[edit]- 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 6993". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 28 December 2025.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 6993". Celestial Atlas. Retrieved 28 December 2025.
- ↑ 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 6993". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 December 2025.
- ↑ Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (2007). "Groups of Galaxies in the Two Micron All Sky Redshift Survey". The Astrophysical Journal. 655 (2): 790. arXiv:astro-ph/0610732. Bibcode:2007ApJ...655..790C. doi:10.1086/510201.
- ↑ "[CHM2007] LDC 1426". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 December 2025.
- ↑ "SN 2020pvb". Transient Name Server. IAU. Retrieved 28 December 2025.
- 1 2 Elias-Rosa, N.; et al. (2024). "SN 2020pvb: A Type IIn-P supernova with a precursor outburst". Astronomy & Astrophysics. 686: A13. arXiv:2402.02924. doi:10.1051/0004-6361/202348790.
External links
[edit]
Media related to NGC 6993 at Wikimedia Commons- NGC 6993 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
