Astronomy:NGC 4981
| NGC 4981 | |
|---|---|
 NGC 4981 imaged by ESO's Very Large Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 13h 08m 48.7580s[1] |
| Declination | −06° 46′ 38.938″[1] |
| Redshift | 0.005597±0.000005[1] |
| Helio radial velocity | 1,678±1 km/s[1] |
| Distance | 72.99 ± 2.10 Mly (22.380 ± 0.645 Mpc)[1] |
| Group or cluster | NGC 4995 group (LGG 333) |
| Apparent magnitude (V) | 12.10[1] |
| Characteristics | |
| Type | SAB(r)bc[1] |
| Size | ~66,500 ly (20.38 kpc) (estimated)[1] |
| Apparent size (V) | 2.8′ × 2.0′[1] |
| Other designations | |
| IRAS 13062-0630, MCG-01-34-003, PGC 45574[1] | |
NGC 4981 is a barred spiral galaxy in the constellation of Virgo. Its velocity with respect to the cosmic microwave background is 2,002±23 km/s, which corresponds to a Hubble distance of 96.3 ± 6.8 Mly (29.54 ± 2.09 Mpc).[1] However, 20 non-redshift measurements give a closer distance of 72.99 ± 2.10 Mly (22.380 ± 0.645 Mpc).[2] It was discovered by German-British astronomer William Herschel on 17 April 1784.[3][4]
NGC 4981 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.[1]
NGC 4995 group
According to A. M. Garcia, NGC 4981 is part of the NGC 4995 group (also known as LGG 333). This group of galaxies has at least five members, including NGC 4928, NGC 4942, NGC 4995, and IC 4212.[5]
Supernovae
Two supernovae have been observed in NGC 4981:
- SN 1968I (Type Ia, mag. 13.5) was discovered by Hungarian astronomer Miklos Lovas on 23 April 1968.[6][7]
- SN 2007C (Type Ib, mag. 15.9) was discovered by Kōichi Itagaki on 7 January 2007.[8][9]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 "Results for object NGC 4981". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+4981.
- ↑ "Distance Results for NGC 4981". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4981.
- ↑ Herschel, W. (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London 76: 457–499. doi:10.1098/rstl.1786.0027. Bibcode: 1786RSPT...76..457H. https://zenodo.org/record/1432282/files/article.pdf.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 4981". https://cseligman.com/text/atlas/ngc49a.htm#4981.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G.
- ↑ Marsden, Brian G. (29 April 1968). "Circular No. 2070". Smithsonian Astrophysical Observatory, IAU. http://www.cbat.eps.harvard.edu/IAUCs/IAUC2070.jpg.
- ↑ "SN 1968I". IAU. https://www.wis-tns.org/object/1968I.
- ↑ Nakano, S.; Itagaki, K.; Kadota, K. (2007). "Supernova 2007C in NGC 4981". Central Bureau Electronic Telegrams (IAU Central Bureau for Astronomical Telegrams) (798). Bibcode: 2007CBET..798....1N. http://www.cbat.eps.harvard.edu/cbet/000700/CBET000798.txt.
- ↑ "SN 2007C". IAU. https://www.wis-tns.org/object/2007C.
External links
- NGC 4981 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
13h 08m 48.7580s, −06° 46′ 38.938″
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