NGC 6384

NGC 6384 is an intermediate barred spiral galaxy located about 77 million light-years away in the northern part of the constellation Ophiuchus. It was discovered on 10 June 1863 by German-British astronomer Albert Marth.^[5]

NGC 6384
NGC 6384 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Ophiuchus
Right ascension	17h 32m 24.302s[1]
Declination	+07° 03′ 36.97″[1]
Redshift	0.005554[2]
Heliocentric radial velocity	1,665 km/s[3]
Distance	76.6 Mly (23.5 Mpc)[3]
Characteristics
Type	SAB(r)bc[4]
Mass	1.05 × 1011[4] M☉
Size	138,000 light years
Other designations
IRAS 17299+0705, 2MASX J17322430+0703369, UGC 10891, MCG +01-45-001, PGC 60459, CGCG 055-007

NGC 6384 has a morphological classification of SAB(r)bc,^[4] indicating that it is a weakly barred galaxy (SAB) with an inner ring structure (r) orbiting the bar, and moderate to loosely wound spiral arms (bc).^[6] The galaxy is inclined by an angle of 47° to the line of sight, along a position angle of 40°.^[7] The estimated mass of the stars in this galaxy is 105 billion times the mass of the Sun.^[4]

At one time NGC 6384 was considered a normal galaxy with no activity in the nucleus. However, it is now classified as a transition object (T2), which is thought to be a LINER-type galaxy whose emission-line spectra is contaminated by H II regions in the nucleus.^[8]

Supernovae

Three supernovae have been observed in NGC 6384. On 24 June 1971, a type Ia supernova event was discovered in this galaxy at 27″ east and 20″ north of the nucleus. It reached a peak visual magnitude of 12.85 around the end of June.^[9] Designated SN 1971L, it was situated along a spiral arm, suggesting that the progenitor was not a member of the older, more evolved stellar population of the galaxy.^[7] On 3 May 2017, SN 2017drh (type Ia, mag. 17.9) was discovered.^[10] On 23 July 2024, SN 2024pxl (type Iax[02cx-like], mag. 17.7) was discovered.^[11]

Gallery

• 
  2MASS image of NGC 6384
• 
  NGC 6384 (SDSS)

References

1. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
2. "NASA/IPAC Extragalactic Database". Results for NGC 6384. Retrieved 21 August 2024.
3. Cappellari, Michele; et al. (May 2011), "The ATLAS^3D project - I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria", Monthly Notices of the Royal Astronomical Society, 413 (2): 813–836, arXiv:1012.1551, Bibcode:2011MNRAS.413..813C, doi:10.1111/j.1365-2966.2010.18174.x, S2CID 15391206.
4. Weinzirl, Tim; et al. (May 2009), "Bulge n and B/T in High-Mass Galaxies: Constraints on the Origin of Bulges in Hierarchical Models", The Astrophysical Journal, 696 (1): 411–447, arXiv:0807.0040, Bibcode:2009ApJ...696..411W, doi:10.1088/0004-637X/696/1/411, S2CID 2847019.
5. Seligman, Courtney. "NGC 6384". Celestial Atlas. Retrieved 21 August 2024.
6. Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.
7. Hakobyan, A. A.; et al. (October 2007), "Study of the HII regions in the spiral galaxy NGC6384", Astrophysics, 50 (4): 426–439, arXiv:0803.4502, Bibcode:2007Ap.....50..426H, doi:10.1007/s10511-007-0040-8, S2CID 15592233.
8. Sánchez-Portal, Miguel; Díaz, Ángeles I.; Terlevich, Elena; Terlevich, Roberto (May 2004), "Structural parameters of nearby emission-line galaxies", Monthly Notices of the Royal Astronomical Society, 350 (3): 1087–1106, arXiv:astro-ph/0403403, Bibcode:2004MNRAS.350.1087S, doi:10.1111/j.1365-2966.2004.07720.x, S2CID 118953569.
9. Barbon, R.; et al. (1973), "Observations of five supernovae 1970-71", Memorie della Società Astronomia Italiana, 44: 65–85, Bibcode:1973MmSAI..44...65B.
10. Transient Name Server entry for SN 2017drh. Retrieved 25 March 2023.
11. Transient Name Server entry for SN 2024pxl. Retrieved 27 July 2024.

External links

• NGC 6384 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• Nemiroff, R.; Bonnell, J., eds. (July 6, 2013). "NGC 6384: Spiral Beyond the Stars". Astronomy Picture of the Day. NASA. Retrieved 2013-06-06.