HD 42540
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 |
| Right ascension | 06h 07m 03.40671s |
| Declination | −62° 09′ 16.4496″ |
| Apparent magnitude (V) | 5.04 |
| Characteristics | |
| Spectral type | K2-3III |
| U−B color index | +1.35 |
| B−V color index | +1.25 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | +21.60 km/s |
| Proper motion (μ) | RA: +15.513 mas/yr Dec.: −70.013 mas/yr |
| Parallax (π) | 8.378 ± 0.0939 mas |
| Distance | 389 ± 4 ly (119 ± 1 pc) |
| Absolute magnitude (MV) | −0.18 |
| Details | |
| Mass | 2.8 M☉ |
| Radius | 27 R☉ |
| Luminosity | 270 L☉ |
| Temperature | 4,530 K |
| Rotational velocity (v sin i) | 1.7 km/s |
| Other designations | |
| 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.
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