Astronomy:NGC 1781
| NGC 1781 | |
|---|---|
 NGC 1781 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Lepus |
| Right ascension | 05h 07m 55.0376s[1] |
| Declination | −18° 11′ 23.373″[1] |
| Redshift | 0.016645±0.0000970[1] |
| Helio radial velocity | 4,990±29 km/s[1] |
| Distance | 240.4 ± 17.0 Mly (73.71 ± 5.20 Mpc)[1] |
| Apparent magnitude (V) | 13.69[1] |
| Characteristics | |
| Type | (R)SB0^0(s) pec[1] |
| Size | ~150,400 ly (46.10 kpc) (estimated)[1] |
| Apparent size (V) | 1.3′ × 1.1′[1] |
| Other designations | |
| ESO 553- G 007, IRAS 05057-1815, NGC 1794, MCG-03-14-002, PGC 16788[1] | |
NGC 1781 is a lenticular galaxy in the constellation of Lepus. Its velocity with respect to the cosmic microwave background is 4,998±29 km/s, which corresponds to a Hubble distance of 240.4 ± 17.0 Mly (73.71 ± 5.20 Mpc).[1] It was discovered by German-British astronomer William Herschel on 6 February 1785.[2][3] It was also observed by American astronomer Ormond Stone on 11 December 1885, causing it to be listed a second time in the New General Catalogue as NGC 1794.[3]
NGC 1781 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[4][5]
Supernova
One supernova has been observed in NGC 1781:
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 "Results for object NGC 1781". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+1781.
- ↑ Herschel, William (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.
- ↑ 3.0 3.1 Seligman, Courtney. "New General Catalogue Objects: NGC 1781". https://cseligman.com/text/atlas/ngc17a.htm#1781.
- ↑ Chen, Yan-Ping; Zaw, Ingyin; Farrar, Glennys R.; Elgamal, Sana (2022). "A Uniformly Selected, Southern-sky 6dF, Optical AGN Catalog". The Astrophysical Journal Supplement Series 258 (2): 29. doi:10.3847/1538-4365/ac4157. Bibcode: 2022ApJS..258...29C.
- ↑ "NGC 1781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+1781.
- ↑ "SN 2025yrt". IAU. https://www.wis-tns.org/object/2025yrt.
External links
- NGC 1781 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
05h 07m 55.0376s, −18° 11′ 23.373″
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