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Coordinates: Sky map 20h 57m 53.987s, −51° 52′ 15.13″
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{{Short description|Spiral galaxy in the constellation Indus}}
{{Sky|20|57|53.987|-|51|52|15.13}}
{{Sky|20|57|53.987|-|51|52|15.13}}

{{Infobox galaxy
{{Infobox galaxy
| name = NGC 6984
| name = [[New General Catalogue|NGC]] 6984
| image = [[File:Stellar explosions in NGC 6984.jpg|300px]]
| image = Stellar explosions in NGC 6984.jpg
| caption = NGC 6984 taken by the [[Hubble Space Telescope]]
| caption = NGC 6984 imaged by the [[Hubble Space Telescope]]
| credit = ESA/Hubble & NASA
| epoch = [[J2000]]
| epoch = [[J2000]]
| pronounce =
| pronounce =
| constellation name =
| constellation name = [[Indus (constellation)|Indus]]
| ra = {{RA|20|57|53.987}}<ref name=simbad>{{cite web|title=Search Results for NGC 6984|url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6984|work=Astronomical Database|publisher=SIMBAD|accessdate=5 November 2013}}</ref>
| ra = {{RA|20|57|53.987}}<ref name=simbad>{{cite web|title=Search Results for NGC 6984|url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6984|work=Astronomical Database|publisher=[[SIMBAD]]|access-date=5 November 2013}}</ref>
| dec = {{DEC|-51|52|15.13}}<ref name=simbad/>
| dec = {{DEC|-51|52|15.13}}<ref name=simbad/>
| z = 0.015386<ref name=simbad/>
| z = 0.015386<ref name=simbad/>
| h_radial_v = 4577 km/s<ref name=simbad/>
| h_radial_v = 4577 km/s<ref name=simbad/>
| gal_v =
| gal_v =
| dist_ly = 180 million [[light year|ly]]<ref name=esahubble>{{cite news|title=Stellar explosions in NGC 6984|url=http://www.spacetelescope.org/images/potw1344a/|accessdate=5 November 2013|newspaper=ESA/Hubble Picture of the Week}}</ref>
| dist_ly = 180 million [[light year|ly]]<ref name=esahubble>{{cite news|title=Stellar explosions in NGC 6984|url=http://www.spacetelescope.org/images/potw1344a/|access-date=5 November 2013|newspaper=ESA/Hubble Picture of the Week}}</ref>
| group_cluster =
| group_cluster =
⚫
| type =
| mass =
| mass =
| mass_light_ratio =
| mass_light_ratio =
Line 23: Line 21:
| appmag_b = 13.19<ref name=simbad/>
| appmag_b = 13.19<ref name=simbad/>
| absmag_v =
| absmag_v =
| mag_j = 10.94<ref name="TheSky"/>
| mag_h = 10.25<ref name="TheSky"/>
| mag_k = 9.99<ref name="TheSky"/>
| sbrightness = 22.82 mag/arcsec<sup>2</sup><ref name="TheSky"/>
⚫
| type = Spiral (SAc)<ref name="TheSky"/>
| size_v = 1.403 x 1.038 arcmin<ref name=simbad/>
| size_v = 1.403 x 1.038 arcmin<ref name=simbad/>
| notes =
| notes =
| names = ESO-LV 235-0200, 2MASX J20575398-5152151, [CHM2007] LDC 1431 J205753.98-5152151, AM 2054-520, IRAS 20543-5203, PSCz Q20543-5203 [SLK2004] 1671, APMBGC 235+046+104, IRAS F20543-5203, QDOT B2054196-520349, 6dFGS gJ205754.0-515215, ISOSS J20578-5152, SGC 205419-5203.8, ESO 235-20, LEDA 65798, [CHM2007] HDC 1131 J205753.98-5152151
| names = {{ odlist | 2MASX= J20575398-5152151 | IRAS= 20543-5203 | PGC= 65798}}, AM 2054-520, APMBGC 235+046+104, ISOSS J20578-5152, SGC 205419-5203.8, ESO 235- G 020
| references =
| references =
}}
}}


'''NGC 6984''' is a [[ barred spiral galaxy]] located 180 million light years away in the constellation [[Indus (constellation)|Indus]].
'''NGC 6984''' is a [[barred spiral galaxy]] located 180 million light years away in the constellation [[Indus (constellation)|Indus]]. It is a Type II [[Seyfert galaxy]], a type of [[Active galactic nucleus]] (AGN).<ref>{{cite web
|url=https://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+6984
|website=simbad.u-strasbg.fr
|title=NGC 6984
|access-date=12 Sep 2024}}</ref> 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.<ref name="TheSky">{{cite web |url=https://theskylive.com/sky/deepsky/ngc6984-object
|website=thesky.com
|title=NGC 6984 - Spiral Galaxy in Indus
|publisher=The Sky LIVE
|access-date=12 Sep 2024}}</ref>
It was discovered on 8 July 1834 by [[United_Kingdom|British]] astronomer [[John Herschel]].<ref name="selig">{{cite web | url = https://cseligman.com/text/atlas/ngc69a.htm#6984 | title = NGC{{nbsp}}6984 | last = Seligman | first = Courtney | website = Celestial Atlas | access-date = 22 August 2024 }}</ref>


== Supernovae ==
It is known for having been the host of two recent supernovae: one in 2012 first known as SNhunt142<ref name="SNhunt">http://www.astronomerstelegram.org/?read=4300</ref> (later designated SN 2012im<ref name="CBET">http://www.cbat.eps.harvard.edu/iau/cbet/003600/CBET003607.txt</ref>), and one in 2013 known as SN 2013ek. The first was a Type Ic<ref name="ATEL_BOSS">http://www.astronomerstelegram.org/?read=5225</ref> and the second was a Type Ib/c.<ref name="ATEL_Valenti">http://www.astronomerstelegram.org/?read=5227</ref> HST observations were initiated by Dr. Dan Milisavljevic.<ref name="Milisavljevic">http://www.stsci.edu/cgi-bin/get-proposal-info?id=13505&observatory=HST</ref>
NGC 6984 is notable for having been the host of two [[supernova]]e which occurred in the same location (< 0.4 arcsec),<ref>
[http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UoOpbJTXiBM NASA's press release] about SN 2013ek said:
{{cite web |url=https://ui.adsabs.harvard.edu/abs/2014AAS...22335429M/abstract
|title=SN 2012im/2013ek: A Supernova Double Take in NGC 6984
|work=SAO Astrophysics Data System (ADS)
|publisher=AAS Meeting #223, id.354.29
|date=January 2014
|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
|title=CBET 3607 : 20130728 : SUPERNOVAE 2012im AND 2013ek IN NGC 6984
|publisher=Central Bureau for Astronomical Telegrams (CBET)
|url-access=subscription
|access-date=12 Sep 2024}}</ref><ref name="ATEL_BOSS">{{Cite web|url=http://www.astronomerstelegram.org/?read=5225|title=ATel #5225: A new SN suspect at the position of SNhunt142 discovered 1 year ago}}</ref> and SN{{nbsp}}2013ek (type{{nbsp}}Ib/c, mag.{{nbsp}}16.9).<ref>{{cite web | website=Transient Name Server | title=SN{{nbsp}}2013ek | url=https://www.wis-tns.org/object/2013ek | publisher = [[International_Astronomical_Union|IAU]] | access-date=22 August 2024}}</ref><ref name="ATEL_Valenti">{{Cite web|url=http://www.astronomerstelegram.org/?read=5227|title=ATel #5227: Spectroscopic classification for PSN J20575390-5152245 with FLOYDS at Faulkes Telescope South}}</ref> [[Hubble Space Telescope]] observations were initiated by Dr. Dan Milisavljevic.<ref name="Milisavljevic">{{Cite web|url=http://www.stsci.edu/cgi-bin/get-proposal-info?id=13505&observatory=HST|title = 13505 Program Information}}</ref>
NASA's press release about SN 2013ek said:


<blockquote>"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."<ref name="NASA_2013ek">{{citation|url=http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UoOpbJTXiBM|title=Hubble Catches Stellar Explosions in NGC 6984 |
<blockquote>"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."<ref name="NASA_2013ek">{{citation|url=http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UoOpbJTXiBM|title=Hubble Catches Stellar Explosions in NGC 6984 |
archiveurl=http://web.archive.org/web/20131121123254/http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UyVUsa2KAy8|archivedate=21 November 2013|publisher=NASA|date=13 November 2013}}</ref></blockquote>
archive-url=https://web.archive.org/web/20131121123254/http://www.nasa.gov/content/goddard/stellar-explosions-in-ngc-6984/#.UyVUsa2KAy8|archive-date=21 November 2013|publisher=[[NASA]]|date=13 November 2013}}</ref></blockquote>

== Gallery ==
{{Gallery|width=200
|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.}}


==References==
==References==
{{reflist}}
{{reflist}}

==External links==
* {{commons category-inline}}


{{Catalogs | NGC = 6984}}
{{Catalogs | NGC = 6984}}
{{Galaxy}}
{{Ngc70}}
{{Indus (constellation)}}


{{DEFAULTSORT:NGC 6984}}
[[Category:Spiral galaxies]]
[[Category:Barred spiral galaxies]]
[[Category:Indus (constellation)]]
[[Category:Indus (constellation)]]
[[Category:NGC objects|6984]]
[[Category:Principal Galaxies Catalogue objects|065798]]
[[Category:IRAS catalogue objects|20543-5203]]
[[Category:Astronomical objects discovered in 1834]]
[[Category:Discoveries by John Herschel]]




{{galaxy-stub}}
{{Spiral-galaxy-stub}}

Latest revision as of 08:18, 12 October 2024

NGC 6984
NGC 6984 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationIndus
Right ascension20h 57m 53.987s[1]
Declination−51° 52′ 15.13″[1]
Redshift0.015386[1]
Heliocentric radial velocity4577 km/s[1]
Distance180 million ly[2]
Apparent magnitude (V)12.65[1]
Apparent magnitude (B)13.19[1]
Surface brightness22.82 mag/arcsec2[3]
magnitude (J)10.94[3]
magnitude (H)10.25[3]
magnitude (K)9.99[3]
Characteristics
TypeSpiral (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]

Supernovae

[edit]

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]

[edit]
  • 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

[edit]
  1. ^ a b c d e f g "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. ^ a b c d e f "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
[edit]
  • Media related to NGC 6984 at Wikimedia Commons


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