| NGC 4559 | |
|---|---|
.jpg) NGC 4559 imaged by theSloan Digital Sky Survey | |
| Observation data (J2000epoch) | |
| Constellation | Coma Berenices |
| Right ascension | 12h 35m 57.6285s[1] |
| Declination | +27° 57′ 35.851″[1] |
| Redshift | 0.002715±0.000002[1] |
| Heliocentric radial velocity | 814 ± 1 km/s[1] |
| Distance | 24.56 ± 1.58 Mly (7.530 ± 0.483 Mpc)[1] |
| Apparent magnitude (V) | 10.4[1] |
| Characteristics | |
| Type | SAB(rs)cd[1] |
| Size | ~92,900 ly (28.48 kpc) (estimated)[1] |
| Apparent size (V) | 10.7′ × 4.4′[1] |
| Other designations | |
| HOLM 423A,IRAS 12334+2814,UGC 7766,MCG +05-30-030,PGC 42002,CGCG 159-024,C 36[1] | |
NGC 4559 (also known asCaldwell 36) is anintermediate spiral galaxy with a weak inner ring structure in theconstellationComa Berenices. Its velocity with respect to thecosmic microwave background is1,096±20 km/s, which corresponds to aHubble distance of 52.7 ± 3.8 Mly (16.17 ± 1.17 Mpc).[1] However, 26non-redshift measurements give a much closer distance of 24.56 ± 1.58 Mly (7.530 ± 0.483 Mpc).[2] It was discovered by German-British astronomerWilliam Herschel on 11 April 1785.[3][4]
NGC 4559 is a member of theComa I Group.[5][6]
Onesupernova has been recorded in NGC 4559:SN 1941A (Type II-L, mag. 13.2)[7] was discovered by Rebecca Jones on 24 February 1941, and after checking previous photographs of the galaxy, it was determined that the supernova was visible starting 5 February 1941.[8]
NGC 4559 is home to theluminous blue variableAT 2016blu (also known asPSN J12355230+2755559, or asNGC 4559OT). It was discovered by theLick Observatory Supernova Search (LOSS) on 11 January 2012.[9][10] It experiences repeated supernova-like outbursts: first when discovered, then again in 2014, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2024, and 2025.[11][12]
Media related toNGC 4559 at Wikimedia Commons
