NGC 945
{{Short description|Galaxy in the constellation Cetus}}
{{Infobox galaxy
| image = NGC 945 NGC 948 legacy dr10.jpg
| name = NGC 945
| epoch = J2000
| appmag_b = 1202h 28m 36s
| dec = -10° 32{{prime}} 20{{pprime}}
| ra = 02h 28m 36s
| sbrightness = 23.01 mag/arcsec2
| caption = NGC 945 (right) and NGC 948 (left)
| names = {{ odlist | MCG= -02-07-013 | 2MASX= J02283732-1032211 | IRAS= 02261-1045 | PGC= 009426 }}
}}
NGC 945 is a barred spiral galaxy in the constellation Cetus,{{Cite web |title=NGC 945 - Galaxy in Cetus {{!}} TheSkyLive.com |url=https://theskylive.com/sky/deepsky/ngc945-object |access-date=2024-04-16 |website=theskylive.com}} located south of the celestial equator. It is estimated to be 200 million light-years from the Milky Way, and about 135,000 light-years in diameter.{{Cite web |last=Ford |first=Dominic |title=NGC945 (Galaxy) |url=https://in-the-sky.org//data/object.php?id=NGC945 |access-date=2024-04-16 |website=In-The-Sky.org |language=en}} The object was discovered by astronomer William Herschel on November 28, 1785. It is within close proximity to NGC 948, with which it forms a gravitationally bound pair of galaxies. In the same area of the sky there are the galaxies NGC 942, NGC 943, NGC 950, and IC 230.
NGC 948
NGC 948 is a spiral galaxy located extremely close to NGC 945.{{Cite web |title=NGC 948 - Spiral Galaxy in Cetus {{!}} TheSkyLive.com |url=https://theskylive.com/sky/deepsky/ngc948-object |access-date=2024-04-16 |website=theskylive.com}} Its speed relative to the cosmic microwave background is 4,259 ± 17 km/s,{{Cite web |title=NGC/IC Project Restoration Efforts |url=https://ngcicproject.observers.org/NGC/NGC_09xx/NGC_0948.htm |access-date=2024-04-16 |website=ngcicproject.observers.org}} which corresponds to a Hubble distance of 62.8 ± 4.4 Mpc (~205 million ly). NGC 948 was discovered by American astronomer Lewis Swift in 1886. The luminosity class of NGC 948 is III and it has a broad HI line. With a surface brightness equal to 14.17 mag/am2, NGC 948 is classified as a low surface brightness galaxy (LSB).{{Cite web | url=http://astrovalleyfield.ca/AstronomieCompl/NGC%20et%20autres/WolfgangS/N0900_exc_web.htm | access-date=2024-05-03 | website=astrovalleyfield.ca | title = Astrovalleyfield }}
Supernovae
Two supernovae have been observed in NGC 945:
- SN{{nbsp}}1998dt (type Ib, mag. 17.7) was discovered by T. Shefler of the University of California at Berkeley on 1 September 1998, as part of the LOSS (Lick Observatory Supernova Search) program at the Lick observatory.{{Cite journal |last1=Shefler |first1=T. |last2=Halderson |first2=E. |last3=Modjaz |first3=M. |last4=King |first4=J. Y. |last5=Li |first5=W. D. |last6=Treffers |first6=R. R. |last7=Filippenko |first7=A. V. |date=1998-09-01 |title=Supernova 1998dt in NGC 945 |url=https://ui.adsabs.harvard.edu/abs/1998IAUC.7006....3S |journal=International Astronomical Union Circular |issue=7006 |pages=3 |bibcode=1998IAUC.7006....3S |issn=0081-0304}}{{cite web | website=Transient Name Server | title=SN{{nbsp}}1998dt | url=https://www.wis-tns.org/object/1998dt | publisher = IAU | access-date=12 December 2024}}
- SN{{nbsp}}2020obd (type{{nbsp}}II, mag. 17.3) was discovered by ATLAS on 6 July 2020.{{cite web | website=Transient Name Server | title=SN{{nbsp}}2020obd | url=https://www.wis-tns.org/object/2020obd | publisher = IAU | access-date=5 September 2024}}{{Cite journal |last1=Srivastav |first1=S. |last2=Smith |first2=K. W. |last3=McBrien |first3=O. |last4=Smartt |first4=S. J. |last5=Gillanders |first5=J. |last6=Clark |first6=P. |last7=Fulton |first7=M. |last8=O'Neill |first8=D. |last9=Young |first9=D. R. |last10=McCollum |first10=M. |last11=Townsend |first11=A. |last12=Chen |first12=T. W. |last13=Anderson |first13=J. |last14=Denneau |first14=L. |last15=Flewelling |first15=H. |date=2020-07-01 |title=ATLAS20say (AT2020obd): discovery of a candidate supernova in NGC 945 (56 Mpc) |url=https://ui.adsabs.harvard.edu/abs/2020TNSAN.133....1S |journal=Transient Name Server AstroNote |volume=133 |pages=1|bibcode=2020TNSAN.133....1S }}
NGC 945 group
NGC 945 is the brightest galaxy in a group of at least 7 members that bears its name.{{Cite journal |last=Garcia |first=A. M. |date=1993-07-01 |title=General study of group membership. II. Determination of nearby groups. |url=https://ui.adsabs.harvard.edu/abs/1993A&AS..100...47G |journal=Astronomy and Astrophysics Supplement Series |volume=100 |pages=47–90 |bibcode=1993A&AS..100...47G |issn=0365-0138}} The other six galaxies in the NGC 945 group are NGC 948, NGC 950, NGC 977, MCG -2-7-20, MCG -2-7-32 and MCG -2-7-337.
See also
References
{{Reflist}}
External links
- [https://simbad.cds.unistra.fr/simbad/sim-basic?Ident=NGC+945&submit=SIMBAD+search NGC 945] at SIMBAD
- [https://simbad.cds.unistra.fr/simbad/sim-basic?Ident=NGC+948&submit=SIMBAD+search NGC 948] at SIMBAD
{{NGC10}}
{{Cetus}}
Category:Barred spiral galaxies