| Epoch | J2000 |
|---|---|
| Constellation name | Corvus |
| Ra | [1] |
| Dec | [1] |
| Z | 0.015437[1] |
| H radial v | 4,628 ± 19 km/s[1] |
| Dist ly | 73.18 ± 5.15 Mpc Mly[1] |
| Size | ~217,500 ly (66.69 kpc) (estimated)[1] |
| Appmag v | 11.7[1] |
| Size v | 1.8 arcminute[1] |
| Names | [1] |
NGC 4782 is an elliptical galaxy in the constellation of Corvus. Its velocity with respect to the cosmic microwave background for is 4,962 ± 30 km/s, which corresponds to a Hubble distance of 73.18 ± 5.15 Mpc Mly.[1] However, nine non-redshift measurements give a closer distance of 58.211 ± 6.811 Mpc Mly.[2] It was discovered by German-British astronomer William Herschel on 27 March 1786.[3]
NGC 4782 along with NGC 4783 are listed together as Holm 485 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[4] They are also listed as VV 201 in the Vorontsov-Vel'yaminov Interacting Galaxies catalogue. However, since NGC 4782 is about 9.54 Mpc farther away than NGC 4783 (using Hubble distance), the grouping is purely optical.
The SIMBAD database lists NGC 4782 as a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.[5]
Supernovae
Two supernovae have been observed in NGC 4782:
- SN 1956B (type unknown, mag. 18.6) was discovered by Fritz Zwicky on 8 April 1956.[6][7]
- SN 2015B (Type Ia, mag. 15) was discovered by the Italian Supernovae Search Project on 5 January 2015.[8][9]
See also
References
- ^ "Results for object NGC 4782". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 22 December 2024.
- ^ "Distance Results for NGC 4782". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 22 December 2024.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 4782". Celestial Atlas. Retrieved 22 December 2024.
- ^ 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
- ^ "NGC 4782". Retrieved 22 December 2024.
- ^ Kowal, C. T.; Sargent, W. L. W.; Zwicky, F. (1970). "The 1969 Palomar Supernova Search". Publications of the Astronomical Society of the Pacific. 82 (487): 736. Bibcode:1970PASP...82..736K. doi:10.1086/128951
- ^ "SN 1956B". Transient Name Server. IAU. Retrieved 22 December 2024.
- ^ Leonini, S.; Conti, M.; Guerrini, G.; Rosi, P.; Tinjaca Ramirez, L. M.; Caimmi, M.; Tomasella, L.; Benetti, S.; Cappellaro, E.; Elias-Rosa, N.; Ochner, P.; Pastorello, A.; Terreran, G.; Tartaglia, L.; Turatto, M. (2015). "Supernova 2015B in NGC 4782 = PSN J12543553-1234186". Central Bureau Electronic Telegrams. ' (4046): 1. Bibcode:2015CBET.4046....1L
- ^ "SN 2015B". Transient Name Server. IAU. Retrieved 22 December 2024.