Astronomy:NGC 6984

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NGC 6984
NGC 6984 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationIndus
Right ascension 20h 57m 53.987s[1]
Declination−51° 52′ 15.13″[1]
Redshift0.015386[1]
Helio radial velocity4577 km/s[1]
Distance180 million ly[2]
Apparent magnitude (V)12.65[1]
Apparent magnitude (B)13.19[1]
Characteristics
TypeSpiral (SAc)[3]
Apparent size (V)1.403 x 1.038 arcmin[1]
Other designations
IRAS 20543-5203, PGC 65798, AM 2054-520, APMBGC 235+046+104, ISOSS J20578-5152, SGC 205419-5203.8, ESO 235- G 020

NGC 6984 is a barred spiral galaxy located 180 million light years away in the constellation Indus. It is a Type II Seyfert galaxy, a type of active galactic nucleus (AGN).[1] It is situated south of the celestial equator, and is visible with the help of a telescope having an aperture of 10 inches (250 mm) or more.[3] It was discovered on 8 July 1834 by British astronomer John Herschel.[4]

Supernovae

NGC 6984 is notable for having been the host of two supernovae which occurred in the same location (< 0.4 arcsec),[5] about 1 year apart: SN 2012im (Type Ic, mag. 18.9), first known as SNhunt142,[6][7][8][9] and SN 2013ek (Type Ib/c, mag. 16.9).[10][11] Hubble Space Telescope observations were initiated by Dr. Dan Milisavljevic.[12] NASA's press release about SN 2013ek said:

"It is so close to where SN 2012im was spotted that the two events are thought to be linked; the chance of two completely independent supernovae so close together and of the same class exploding within one year of one another is a very unlikely event. It was initially suggested that SN 2013ek may in fact be SN 2012im flaring up again, but further observations support the idea that they are separate supernovae — although they may be closely related in some as-yet-unknown way."[13]

  • The galaxy NGC 6984, an elegant spiral galaxy in the constellation Indus roughly 200 million light-years away from Earth.
    The galaxy NGC 6984, an elegant spiral galaxy in the constellation Indus roughly 200 million light-years away from Earth.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NGC 6984". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6984. 
  2. ↑ "Stellar explosions in NGC 6984". ESA/Hubble Picture of the Week. https://www.spacetelescope.org/images/potw1344a/. 
  3. ↑ 3.0 3.1 "NGC 6984 - Spiral Galaxy in Indus". The Sky LIVE. https://theskylive.com/sky/deepsky/ngc6984-object. 
  4. ↑ Seligman, Courtney. "NGC 6984". https://cseligman.com/text/atlas/ngc69a.htm#6984. 
  5. ↑ Milisavljevic, Dan; Drout, M.; Margutti, R.; Soderberg, A. M.; Fesen, R. A.; Parker, S.; Brimacombe, J.; Sanders, N. et al. (January 2014). "SN 2012im/2013ek: A Supernova Double Take in NGC 6984". SAO Astrophysics Data System (ADS) (AAS Meeting #223, id.354.29) 223. Bibcode: 2014AAS...22335429M. https://ui.adsabs.harvard.edu/abs/2014AAS...22335429M/abstract. Retrieved 12 Sep 2024. 
  6. ↑ Cellier-Holzem, Flora; Smartt, S. J.; Inserra, C.; Fraser, M.; Wright, D.; Young, D. R.; Smith, K. W.; Pastorello, A. et al. (2012). "PESSTO spectroscopic classification of optical transients". The Astronomer's Telegram 4300: 1. Bibcode: 2012ATel.4300....1C. https://www.astronomerstelegram.org/?read=4300. 
  7. ↑ Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, M. et al. (2013). "Supernovae 2012im and 2013ek in NGC 6984". Central Bureau Electronic Telegrams (3607): 1. Bibcode: 2013CBET.3607....1H. 
  8. ↑ Parker, Stu; Bock, Greg; Marples, Peter; Drescher, Colin; Pearl, Patrick; Downs, Brendan (2013). "A new SN suspect at the position of SNhunt142 discovered 1 year ago". The Astronomer's Telegram 5225: 1. Bibcode: 2013ATel.5225....1P. https://www.astronomerstelegram.org/?read=5225. 
  9. ↑ "SN 2012im". IAU. https://www.wis-tns.org/object/2012im. 
  10. ↑ Valenti, S.; Sand, D.; Howell, D. A.; Graham, M. L.; Parrent, J. T. (2013). "Spectroscopic classification for PSN J20575390-5152245 with FLOYDS at Faulkes Telescope South". The Astronomer's Telegram 5227: 1. Bibcode: 2013ATel.5227....1V. https://www.astronomerstelegram.org/?read=5227. 
  11. ↑ "SN 2013ek". IAU. https://www.wis-tns.org/object/2013ek. 
  12. ↑ "13505 Program Information". http://www.stsci.edu/cgi-bin/get-proposal-info?id=13505&observatory=HST. 
  13. ↑ Hubble Catches Stellar Explosions in NGC 6984, NASA, 13 November 2013, http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UoOpbJTXiBM 

Template:NGC objects: 6001-7000

Coordinates: Sky map 20h 57m 53.987s, −51° 52′ 15.13″



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