HD 42540
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pictor
|
| Right ascension | 06h 07m 03.40671s[1] |
| Declination | −62° 09′ 16.4496″[1] |
| Apparent magnitude (V) | 5.04[2] |
| Characteristics | |
| Spectral type | K2-3III[3] |
| U−B color index | +1.35[4] |
| B−V color index | +1.25[4] |
| Variable type | suspected[5] |
| Absolute magnitude (MV) | −0.18[2] |
| Details | |
Rotational velocity (v sin i) | 1.7[9] km/s |
SAO 249451 | |
| Database references | |
| SIMBAD | data |
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.
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]
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119257644. Vizier catalog entry
- Bibcode:1995yCat.5050....0H.
- ^
- ^ Watson, Christopher (18 January 2010). "NSV 2845". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 May 2014.
- LCCN 54001336.
- ^ ISSN 0004-6361.
- S2CID 118665352. Vizier catalog entry
- S2CID 54046583. Vizier catalog entry
- Bibcode:1883Obs.....6..127.
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