HD 42540
Star in the constellation Pictor
From Wikipedia, the free encyclopedia
HD 42540, also known as HR 2196, is a giant star in the constellation Pictor. A class K2-3III orange giant, its apparent magnitude is 5.04 and it is approximately 389 light years away based on parallax.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pictor[1] |
| Right ascension | 06h 07m 03.40671s[2] |
| Declination | −62° 09′ 16.4496″[2] |
| Apparent magnitude (V) | 5.04[1] |
| Characteristics | |
| Spectral type | K2-3III[3] |
| U−B color index | +1.35[4] |
| B−V color index | +1.25[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | +21.60[6] km/s |
| Proper motion (μ) | RA: +15.513[2] mas/yr Dec.: −70.013[2] mas/yr |
| Parallax (π) | 8.378±0.0939 mas[2] |
| Distance | 389 ± 4 ly (119 ± 1 pc) |
| Absolute magnitude (MV) | −0.18[1] |
| Details | |
| Mass | 2.8[7] M☉ |
| Radius | 27[7] R☉ |
| Luminosity | 270[2] L☉ |
| Temperature | 4,530[8] K |
| Rotational velocity (v sin i) | 1.7[9] km/s |
| Other designations | |
| μ Dor, CD−62°235, FK5 2469, GC 7825, HIP 28991, HR 2196, HD 42540, NSV 2845, SAO 249451 | |
| Database references | |
| SIMBAD | data |
This star was mistakenly catalogued as Mu Doradus (Mu Dor/μ Doradus/μ Dor) at incorrect coordinates, then assumed to be variable as no 5th-magnitude star was seen at that position. It also has the Gould designation 47 G. Pictoris.[10]
