HD 50281

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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[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[edit]

  1. ^ a b c d e 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[edit]