NGC 6984

Last updated
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
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.