NGC 6984: Difference between revisions
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{{Short description|Spiral galaxy in the constellation Indus}} |
{{Short description|Spiral galaxy in the constellation Indus}} |
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{{Sky|20|57|53.987|-|51|52|15.13}} |
{{Sky|20|57|53.987|-|51|52|15.13}} |
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{{Infobox galaxy |
{{Infobox galaxy |
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| name = NGC 6984 |
| name = NGC 6984 |
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== Supernovae == |
== Supernovae == |
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NGC 6984 is notable for having been the host of two [[supernova]]e which occurred in the same location, about 1 year apart: SN 2012im ([[Type_Ib_and_Ic_supernovae|type{{nbsp}}Ic]], mag.{{nbsp}}18.9),<ref>{{cite web | website=Transient Name Server | title=SN{{nbsp}}2012im | url=https://www.wis-tns.org/object/2012im |publisher = [[International_Astronomical_Union|IAU]] | access-date=22 August 2024}}</ref> first known as SNhunt142<ref name="SNhunt">{{Cite web|url=http://www.astronomerstelegram.org/?read=4300|title=ATel #4300: PESSTO spectroscopic classification of optical transients}}</ref><ref name="CBET"> {{cite web |url=http://www.cbat.eps.harvard.edu/cbet/003600/CBET003607.txt |
NGC 6984 is notable for having been the host of two [[supernova]]e which occurred in the same location (< 0.4 arcsec)<ref> |
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{{cite web |url=https://ui.adsabs.harvard.edu/abs/2014AAS...22335429M/abstract |
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|title=SN 2012im/2013ek: A Supernova Double Take in NGC 6984 |
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|work=SAO Astrophysics Data System (ADS) |
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|publisher=AAS Meeting #223, id.354.29 |
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|date=January 2014 |
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|access-date=12 Sep 2024}}</ref>, about 1 year apart: SN 2012im ([[Type_Ib_and_Ic_supernovae|type{{nbsp}}Ic]], mag.{{nbsp}}18.9),<ref>{{cite web | website=Transient Name Server | title=SN{{nbsp}}2012im | url=https://www.wis-tns.org/object/2012im |publisher = [[International_Astronomical_Union|IAU]] | access-date=22 August 2024}}</ref> first known as SNhunt142<ref name="SNhunt">{{Cite web|url=http://www.astronomerstelegram.org/?read=4300|title=ATel #4300: PESSTO spectroscopic classification of optical transients}}</ref><ref name="CBET"> {{cite web |url=http://www.cbat.eps.harvard.edu/cbet/003600/CBET003607.txt |
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|title=CBET 3607 : 20130728 : SUPERNOVAE 2012im AND 2013ek IN NGC 6984 |
|title=CBET 3607 : 20130728 : SUPERNOVAE 2012im AND 2013ek IN NGC 6984 |
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|publisher=Central Bureau for Astronomical Telegrams (CBET) |
|publisher=Central Bureau for Astronomical Telegrams (CBET) |
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== Gallery == |
== Gallery == |
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{{Gallery|width=200 |
{{Gallery|width=200 |
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|File:NGC6984 - HST - Potw2144a.jpg|The galaxy NGC 6984, an elegant spiral galaxy in the constellation Indus roughly 200 million light-years away from Earth. |
|File:NGC6984 - HST - Potw2144a.jpg|The galaxy NGC 6984, an elegant spiral galaxy in the constellation Indus roughly 200 million light-years away from Earth.}} |
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}} |
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==References== |
==References== |
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Revision as of 23:42, 12 September 2024
| NGC 6984 | |
|---|---|
 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] |
| Characteristics | |
| 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 was discovered on 8 July 1834 by British astronomer John Herschel.[3]
Supernovae
NGC 6984 is notable for having been the host of two supernovae which occurred in the same location (< 0.4 arcsec)[4], about 1 year apart: SN 2012im (type Ic, mag. 18.9),[5] first known as SNhunt142[6][7][8], and SN 2013ek (type Ib/c, mag. 16.9).[9][10] Hubble Space Telescope observations were initiated by Dr. Dan Milisavljevic.[11] 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."[12]
Gallery
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The galaxy NGC 6984, an elegant spiral galaxy in the constellation Indus roughly 200 million light-years away from Earth.
References
- ^ a b c d e f g "Search Results for NGC 6984". Astronomical Database. SIMBAD. Retrieved 5 November 2013.
- ^ "Stellar explosions in NGC 6984". ESA/Hubble Picture of the Week. Retrieved 5 November 2013.
- ^ Seligman, Courtney. "NGC 6984". Celestial Atlas. Retrieved 22 August 2024.
- ^ "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.
- ^ "SN 2012im". Transient Name Server. IAU. Retrieved 22 August 2024.
- ^ "ATel #4300: PESSTO spectroscopic classification of optical transients".
- ^ "CBET 3607 : 20130728 : SUPERNOVAE 2012im AND 2013ek IN NGC 6984". Central Bureau for Astronomical Telegrams (CBET). Retrieved 12 Sep 2024.
- ^ "ATel #5225: A new SN suspect at the position of SNhunt142 discovered 1 year ago".
- ^ "SN 2013ek". Transient Name Server. IAU. Retrieved 22 August 2024.
- ^ "ATel #5227: Spectroscopic classification for PSN J20575390-5152245 with FLOYDS at Faulkes Telescope South".
- ^ "13505 Program Information".
- ^ Hubble Catches Stellar Explosions in NGC 6984, NASA, 13 November 2013, archived from the original on 21 November 2013
External links
Media related to NGC 6984 at Wikimedia Commons
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