Astronomy:NGC 309
From HandWiki
| NGC 309 | |
|---|---|
 SDSS image of NGC 309 | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 00h 56m 42.653s[1] |
| Declination | −09° 54′ 49.883″[1] |
| Redshift | 0.018883[1] |
| Helio radial velocity | 5661 ± 2 km/s[1] |
| Distance | 87.99 ± 10.45 Mly (26.978 ± 3.205 Mpc)[1] |
| Apparent magnitude (V) | 13.4g[1] |
| Characteristics | |
| Type | SAB(r)c[1] |
| Size | ~80,900 ly (24.81 kpc) (estimated)[1] |
| Apparent size (V) | 1.94′ × 1.34′[1] |
| Other designations | |
| HOLM 027A, IRAS 00542-1010, MCG-02-03-050, PGC 3377[1] | |
NGC 309 is a spiral galaxy in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5343 ± 22 km/s, which corresponds to a Hubble distance of 257.0 ± 18.0 Mly (78.81 ± 5.53 Mpc).[1] However, nine non-redshift measurements give a much closer distance of 87.99 ± 10.45 Mly (26.978 ± 3.205 Mpc).[2] It was discovered in 1876 by Wilhelm Tempel.[3]
NGC 309 and NGC 309A are listed together as Holm 27 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[4]
Supernovae
Five supernovae have been observed in NGC 309.
| Supernova | apmag | type | Discovery date |
|---|---|---|---|
| 1999ge[5] | 15.5 | II | 27 November 1999 |
| 2008cx[6] | 17.8 | IIb | 5 June 2008 |
| 2012dt[7] | 18.0 | IIP | 17 July 2012 |
| PSN J00564446-0954595[8] | 17.2 | IIb | 10 June 2013 |
| 2014ef[9][10] | 17.3 | Ib | 13 December 2014 |
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 "NASA/IPAC Extragalactic Database". Results for NGC 0309. https://ned.ipac.caltech.edu/byname?objname=ngc+309.
- ↑ "Distance Results for NGC 309". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+309.
- ↑ "New General Catalog Objects: NGC 300 - 349". Cseligman. http://cseligman.com/text/atlas/ngc3.htm#309.
- ↑ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund 6: 1. Bibcode: 1937AnLun...6....1H.
- ↑ "SN 1999ge". IAU. https://www.wis-tns.org/object/1999ge.
- ↑ "SN 2008cx". IAU. https://www.wis-tns.org/object/2008cx.
- ↑ "SN 2012dt". IAU. https://www.wis-tns.org/object/2012dt.
- ↑ Fox, Derek (17 June 2013). "FIRE Classification of Supernova in NGC 309". https://www.astronomerstelegram.org/?read=5141.
- ↑ 2014ef in NGC 309 (David Bishop)
- ↑ "SN 2014ef". IAU. https://www.wis-tns.org/object/2014ef.
External links
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