Astronomy:NGC 6794

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NGC 6794
NGC 6794 imaged by Legacy Surveys
Observation data (J2000 epoch)
ConstellationSagittarius
Right ascension 19h 28m 03.8849s[1]
Declination−38° 55′ 07.297″[1]
Redshift0.020077±0.0000300[1]
Helio radial velocity6,019±9 km/s[1]
Distance315.94 ± 1.96 Mly (96.867 ± 0.601 Mpc)[1]
Group or clusterLDC 1344
Apparent magnitude (V)13.9[1]
Characteristics
TypeSA(rs)ab[1]
Size~229,700 ly (70.44 kpc) (estimated)[1]
Apparent size (V)1.7′ × 1.5′[1]
Other designations
ESO 338- G 005, MCG-07-40-001, PGC 63241[1]

NGC 6794 is a large spiral galaxy in the constellation of Sagittarius. Its velocity with respect to the cosmic microwave background is 5,887±13 km/s, which corresponds to a Hubble distance of 283.2 ± 19.8 Mly (86.83 ± 6.08 Mpc).[1] However, three non-redshift measurements give a farther mean distance of 315.94 ± 1.96 Mly (96.867 ± 0.601 Mpc).[2] It was discovered by British astronomer John Herschel on 24 August 1834.[3][4]

NGC 6794 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.[5][6]

NGC 6794 viewed through visible light

Galaxy group

NGC 6794 is a member of a small galaxy group known as LDC 1344, which includes the galaxies ESO 338-7 (d) and ESO 338-9 (d).[7][8]

Supernova

One supernova has been observed in NGC 6794:

  • SN 2024dgn (Type Ia, mag. 15.719) was discovered by ATLAS on 26 February 2024.[9]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 6794". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+6794. 
  2. ↑ "Distance Results for NGC 6794". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+6794. 
  3. ↑ Herschel, J. F. W (1864). "Catalogue of Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London 154: 1–137. doi:10.1098/rstl.1864.0001. Bibcode: 1864RSPT..154....1H. 
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 6794". https://cseligman.com/text/atlas/ngc67a.htm#6794. 
  5. ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D. et al. (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. doi:10.1093/mnras/staa766. Bibcode: 2020MNRAS.494.1784A. 
  6. ↑ "NGC 6794". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6794. 
  7. ↑ "[CHM2007 LDC 1344"]. SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%5BCHM2007%5D+LDC+1344. 
  8. ↑ 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. doi:10.1086/510201. Bibcode: 2007ApJ...655..790C. 
  9. ↑ "SN 2024dgn". IAU. https://www.wis-tns.org/object/2024dgn. 

Coordinates: Sky map 19h 28m 03.8849s, −38° 55′ 07.297″



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