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[1] |
| 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[2] mas |
| Distance | approx. 800 ly (approx. 240 pc) |
| Details | |
| Luminosity | 595 [3] L☉ |
| Temperature | 3900 K[3] K |
| Other designations | |
| 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
- 1 2 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. - 1 2 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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