HD 50281

HD 50281

Observation data Epoch J2000      Equinox J2000
Constellation	Monoceros
Right ascension	06^h 52^m 18.05^s[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[1] mas
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
88 G. Monocerotis, BD -05°1844, GCTP 1606.00, GJ 250, HD 50281, HIP 32984, LFT 494, LHS 1875, LTT 2662, SAO 133805.

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

1. van Leeuwen, F. (2007). "HIP 32984". Hipparcos, the New Reduction. Retrieved 2009-12-17.
2. 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.
3. 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

• SolStation
• ARICNS