NGC 3239
NGC 3239 is an irregular galaxy in the constellation of Leo.[2] It is the host of SN 2012A, the first supernova of 2012.[3] The galaxy, which was discovered in 1784 by William Herschel,[4] is part of the New Galactic Catalogue, and with an apparent magnitude of 13.5, is not visible to the naked eye.[2] It has been shown to have many HII regions, while also having some star formation regions. These signs are common in galactic mergers, which is why it is believed that NGC 3239 is the result of a galactic merger.[5] The supernova, SN 2012A, has been classified as a type IIP supernova, with a shorter plateau and non-constant luminosity.[6]
| NGC 3239 | |
|---|---|
 Image of NGC 3239 (top center) as taken by the Mount Lemmon Sky Center, the bright spot inside the irregular galaxy is SN2012A | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 10h 25m 06.24s[1] |
| Declination | +17° 09′ 37.8″[1] |
| Distance (comoving) | 26 Mly (8.1 Mpc)h−1 0.73 |
| Distance | 86 Mly (26.4 Mpc)h−1 0.73 |
| Apparent magnitude (B) | 13.5[1] |
| Characteristics | |
| Type | IB(s)mpec[1] |
| Other designations | |
| Arp 263, UGC 5637, MCG+03-27-025, PGC 30560[1] | |
References
- "NGC 3239". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 March 2019.
- Ford, Dominic. "The galaxy NGC 3239 - In-The-Sky.org". in-the-sky.org. Retrieved 2019-03-09.
- "APOD: 2012 January 27 - NGC 3239 and SN 2012A". apod.nasa.gov. Retrieved 2019-03-09.
- "New General Catalog Objects: NGC 3200 - 3249". cseligman.com. Retrieved 2019-03-12.
- "1990PASP..102...41K Page 41". adsbit.harvard.edu. Retrieved 2019-03-09.
- Tomasella, L.; Cappellaro, E.; Fraser, M.; Pumo, M. L.; Pastorello, A.; Pignata, G.; Benetti, S.; Bufano, F.; Dennefeld, M.; Harutyunyan, A.; Iijima, T.; Jerkstrand, A.; Kankare, E.; Kotak, R.; Magill, L.; Nascimbeni, V.; Ochner, P.; Siviero, A.; Smartt, S.; Sollerman, J.; Stanishev, V.; Taddia, F.; Taubenberger, S.; Turatto, M.; Valenti, S.; Wright, D. E.; Zampieri, L. (2013). "Comparison of progenitor mass estimates for the type IIP SN 2012A". Monthly Notices of the Royal Astronomy Society. 434 (2): 1636–1657. arXiv:1305.5789. Bibcode:2013MNRAS.434.1636T. doi:10.1093/mnras/stt1130.
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