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NGC 491
View on Wikipedia| NGC 491 | |
|---|---|
 NGC 491 imaged by the Hubble Space Telescope, showing its spiral arms | |
| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 01h 21m 20.4504s[1] |
| Declination | −34° 03′ 48.096″[1] |
| Redshift | 0.012902±0.0000330[1] |
| Heliocentric radial velocity | 3,868±10 km/s[1] |
| Distance | 203.09 ± 7.02 Mly (62.267 ± 2.152 Mpc)[1] |
| Apparent magnitude (V) | 13.21[1] |
| Characteristics | |
| Type | SB(rs)b[1] |
| Size | ~91,900 ly (28.17 kpc) (estimated)[1] |
| Apparent size (V) | 1.4′ × 1.0′[1] |
| Other designations | |
| ESO 352- G 053, GC 279, IRAS 01190-3419, MCG -06-04-011, PGC 4914[1] | |
NGC 491 is a barred spiral galaxy in the constellation Sculptor.[2][1] Its velocity with respect to the cosmic microwave background is 3,635±19 km/s, which corresponds to a Hubble distance of 174.9 ± 12.3 Mly (53.62 ± 3.77 Mpc).[1] However, nine non-redshift measurements give a farther mean distance of 203.09 ± 7.02 Mly (62.267 ± 2.152 Mpc).[3] It was discovered by British astronomer John Herschel on 25 September 1834.[4]
NGC 491 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.[5]
Supernova
[edit]One supernova has been observed in NGC 491: SN 2025yjt (Type II, mag. 17.827) was discovered by ATLAS on 24 September 2025.[6]
See also
[edit]References
[edit]- ^ a b c d e f g h i j k l "Results for object NGC 0491". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 2017-06-04.
- ^ Rojas, Sebastián García. "Galaxy NGC 491 - Galaxy in Sculptor Constellation · Deep Sky Objects Browser". DSO Browser. Archived from the original on 2017-10-02. Retrieved 2017-06-04.
- ^ "Distance Results for NGC 0491". NASA/IPAC Extragalactic Database. NASA. Retrieved 25 September 2025.
- ^ "New General Catalog Objects: NGC 450 - 499". cseligman.com. Retrieved 2017-06-04.
- ^ "NGC 491". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 September 2025.
- ^ "SN 2025yjt". Transient Name Server. IAU. Retrieved 25 September 2025.
External links
[edit]
- NGC 491 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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