NGC 6646 is a spiral galaxy located in the constellation Lyra.[1] Its velocity relative to the cosmic microwave background is 5,641 ± 35 km/s, which corresponds to a Hubble distance of 83.2 ± 5.9 Mpc (∼271 million ly).[2] NGC 6646 was discovered by the German-British astronomer William Herschel on 26 June 1802.[3] The luminosity class of NGC 6646 is I.[2]
| NGC 6646 | |
|---|---|
 NGC 6466, as seen during the Pan-STARRS survey | |
| Observation data (J2000 epoch) | |
| Constellation | Lyra |
| Right ascension | 18h 29m 38s |
| Declination | 39° 51′ 54.5″ |
| Apparent magnitude (V) | 12.6 |
| Apparent magnitude (B) | 13.5 |
| Surface brightness | 13.40 mag/am2 |
| Characteristics | |
| Type | Sa/Sa/R |
| Size | ~112,000 ly |
| Other designations | |
| UGC 11258, MCG 7-38-8, PGC 61944, CGCG 228-10 | |
One supernova has been observed in NGC 6646: SN 2024gqf (type Ia, mag. 19.7).[4]
See also
editExternal links
editReferences
edit- ^ "NGC_6646". simbad.u-strasbg.fr. Retrieved 2024-09-27.
- ^ a b "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-09-27.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 6261". Celestial Atlas. Retrieved 10 September 2024.
- ^ "SN 2024gqf". Transient Name Server. IAU. Retrieved 30 September 2024.