HD 39225

HD 39225
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 52m 40.09270s
Declination	+33° 55′ 02.8577″
Apparent magnitude (V)	5.82 - 6.07
Characteristics
Spectral type	M1.5II-III
U−B color index	1.97
B−V color index	1.6
Variable type	Variable star
Astrometry
Radial velocity (Rv)	98.94 ± 1.69 km/s
Proper motion (μ)	RA: 17.81 ± 0.65 mas/yr ; Dec.: 8.09 ± 0.42 mas/yr
Parallax (π)	4.23 ± 0.64 mas
Distance	approx. 800 ly ; (approx. 240 pc)
Details
Luminosity	595 L☉
Temperature	3900 K K
Other designations
	HIP 27778, SAO 58528, HR 2028 BD+33° 1179, GSC 02414-00524, HD 39225.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue,; CCDM (2002),; Bright Star Catalogue (5th rev. ed.)

HD 39225, also known as HR 2028, is a variable star in the constellation Auriga. A red giant star, it is suspected of varying in brightness between magnitudes 5.82 and 6.07.^[1] Located around 800 light-years distant, it shines with a luminosity approximately 595 times that of the Sun and has a surface temperature of 3900 K.^[3]

References

^ ^a ^b Watson, Christopher (18 January 2010). "NSV 2681". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 28 June 2015.
^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
^ ^a ^b ^c 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): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.

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[AAVSO-1] Watson, Christopher (18 January 2010). "NSV 2681". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 28 June 2015.

[vanLeeuwen2007-2] van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.

[Mcdonald-3] 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): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.

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