NGC 6646
Spiral galaxy in the constellation Lyra
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NGC 6646 is a spiral galaxy located in the constellation Lyra.[2] 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).[1] NGC 6646 was discovered by German-British astronomer William Herschel on 26 June 1802.[3] The luminosity class of NGC 6646 is I.[1]
Right ascension118h 29m 38.742s[1]
Declination+39° 51′ 54.528″[1]
| NGC 6646 | |
|---|---|
NGC 6466 imaged by the Pan-STARRS survey | |
| Observation data (J2000 epoch) | |
| Constellation | Lyra |
| Right ascension | 118h 29m 38.742s[1] |
| Declination | +39° 51′ 54.528″[1] |
| Redshift | 0.019227[1] |
| Heliocentric radial velocity | 5764 ± 34 km/s[1] |
| Distance | 271.4 ± 19.1 Mly (83.21 ± 5.87 Mpc)[1] |
| Apparent magnitude (V) | 12.6 |
| Apparent magnitude (B) | 13.5 |
| Surface brightness | 13.40 mag/am2 |
| Characteristics | |
| Type | Sa[1] |
| Size | ~173,900 ly (53.33 kpc) (estimated)[1] |
| Other designations | |
| UGC 11258, MCG +07-38-008, PGC 61944, CGCG 228-010 | |
One supernova has been observed in NGC 6646: SN 2024gqf (Type Ia, mag. 19.7) was discovered by the Catalina Real-time Transient Survey (SNHunt) on 15 April 2024.[4]