HD 50281
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 52m 18.05s[1] |
| Declination | −05° 10′ 25.4″[1] |
| Apparent magnitude (V) | 6.57/10.08 |
| Characteristics | |
| Spectral type | K3 V/M2.5 V |
| U−B color index | 0.95/1.21 |
| B−V color index | 1.06/1.47 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | -10.3 km/s |
| Proper motion (μ) | RA: -544.14 ± 0.44[1] mas/yr Dec.: -3.32 ± 0.34[1] mas/yr |
| Parallax (π) | 114.81 ± 0.44 mas[1] |
| Distance | 28.4 ± 0.1 ly (8.71 ± 0.03 pc) |
| Absolute magnitude (MV) | 6.88 |
| Details | |
| Mass | 0.80/0.50 M☉ |
| Radius | 0.67/0.10 R☉ |
| Luminosity | 0.15/0.00058 L☉ |
| Temperature | 4,712 ± 8.5[2] / 3900 K |
| Metallicity [Fe/H] | +0.01 ± 0.17[3] dex |
| Other designations | |
HD 50281 (also known as Gliese 250) is a binary star system with a relatively high proper motion. The primary star is a main sequence orange dwarf star, while the smaller companion is a red dwarf. The two stars are separated by 58 arcsecs, which, at the estimated distance, is equivalent to about 500 AUs.
References
- ^ a b c d e van Leeuwen, F. (2007). "HIP 32984". Hipparcos, the New Reduction. Retrieved 2009-12-17.
- ^ Kovtyukh; et al. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios". Astronomy and Astrophysics. 411 (3): 559–564. arXiv:astro-ph/0308429. Bibcode:2003A&A...411..559K. doi:10.1051/0004-6361:20031378.
- ^ Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs". The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.
External links
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