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.

HD 42540

Location of HD 42540 (circled)
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]
Astrometry
Radial velocity (Rv)	+21.60[6] km/s
Proper motion (μ)	RA: +15.513[1] mas/yr Dec.: −70.013[1] mas/yr
Parallax (π)	8.378±0.0939 mas[1]
Distance	389 ± 4 ly (119 ± 1 pc)
Absolute magnitude (MV)	−0.18[2]
Details
Mass	2.8[7] M☉
Radius	27[7] R☉
Luminosity	270[1] 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]