| NGC 491 | |
|---|---|
 NGC 491 imaged by theHubble Space Telescope, showing its spiral arms | |
| Observation data (J2000epoch) | |
| 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 abarred spiral galaxy in the constellationSculptor.[2][1] Its velocity with respect to thecosmic microwave background is3,635±19 km/s, which corresponds to aHubble distance of 174.9 ± 12.3 Mly (53.62 ± 3.77 Mpc).[1] However, ninenon-redshift measurements give a farther mean distance of 203.09 ± 7.02 Mly (62.267 ± 2.152 Mpc).[3] It was discovered by British astronomerJohn Herschel on 25 September 1834.[4]
NGC 491 is aSeyfert II galaxy, i.e. it has aquasar-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]
Onesupernova has been observed in NGC 491:SN 2025yjt (Type II, mag. 17.827) was discovered byATLAS on 24 September 2025.[6]
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