NGC 6984

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NGC 6984
Stellar explosions in NGC 6984.jpg
NGC 6984 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation Indus
Right ascension 20h 57m 53.987s [1]
Declination −51° 52′ 15.13″ [1]
Redshift 0.015386 [1]
Heliocentric radial velocity 4577 km/s [1]
Distance 180 million ly [2]
Apparent magnitude  (V)12.65 [1]
Apparent magnitude  (B)13.19 [1]
Surface brightness 22.82 mag/arcsec2 [3]
magnitude  (J)10.94 [3]
magnitude  (H)10.25 [3]
magnitude  (K)9.99 [3]
Characteristics
Type Spiral (SAc) [3]
Apparent size  (V)1.403 x 1.038 arcmin [1]
Other designations
IRAS 20543-5203, 2MASX J20575398-5152151, 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). [4] 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. [5]

Contents

Supernovae

NGC 6984 is notable for having been the host of two supernovae which occurred in the same location (< 0.4 arcsec), [6] about 1 year apart: SN 2012im (type Ic, mag. 18.9), [7] first known as SNhunt142, [8] [9] [10] and SN 2013ek (type Ib/c, mag. 16.9). [11] [12] Hubble Space Telescope observations were initiated by Dr. Dan Milisavljevic. [13] 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." [14]

References

  1. 1 2 3 4 5 6 7 "Search Results for NGC 6984". Astronomical Database. SIMBAD . Retrieved 5 November 2013.
  2. ↑ "Stellar explosions in NGC 6984". ESA/Hubble Picture of the Week. Retrieved 5 November 2013.
  3. 1 2 3 4 5 6 "NGC 6984 - Spiral Galaxy in Indus". thesky.com. The Sky LIVE. Retrieved 12 Sep 2024.
  4. ↑ "NGC 6984". simbad.u-strasbg.fr. Retrieved 12 Sep 2024.
  5. ↑ Seligman, Courtney. "NGC 6984". Celestial Atlas. Retrieved 22 August 2024.
  6. ↑ "SN 2012im/2013ek: A Supernova Double Take in NGC 6984". SAO Astrophysics Data System (ADS). AAS Meeting #223, id.354.29. January 2014. Retrieved 12 Sep 2024.
  7. ↑ "SN 2012im". Transient Name Server. IAU . Retrieved 22 August 2024.
  8. ↑ "ATel #4300: PESSTO spectroscopic classification of optical transients".
  9. ↑ "CBET 3607 : 20130728 : SUPERNOVAE 2012im AND 2013ek IN NGC 6984" . Central Bureau for Astronomical Telegrams (CBET). Retrieved 12 Sep 2024.
  10. ↑ "ATel #5225: A new SN suspect at the position of SNhunt142 discovered 1 year ago".
  11. ↑ "SN 2013ek". Transient Name Server. IAU . Retrieved 22 August 2024.
  12. ↑ "ATel #5227: Spectroscopic classification for PSN J20575390-5152245 with FLOYDS at Faulkes Telescope South".
  13. ↑ "13505 Program Information".
  14. ↑ Hubble Catches Stellar Explosions in NGC 6984, NASA, 13 November 2013, archived from the original on 21 November 2013


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