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]

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
3. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
4. Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
5. Watson, Christopher (18 January 2010). "NSV 2845". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 May 2014.
6. Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
7. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
8. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352. Vizier catalog entry
9. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583. Vizier catalog entry
10. "Notes". The Observatory. 6: 127. 1883. Bibcode:1883Obs.....6..127.