HD 49933

HD 49933
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 06h 50m 49.83180s[1]
Declination –00° 32′ 27.1701″[1]
Apparent magnitude (V) 5.781[2]
Characteristics
HD 49993 A
Spectral type F2 V[3]
U−B color index –0.07[4]
B−V color index +0.39[4]
HD 49993 B
Spectral type M0[5]
Astrometry
Radial velocity (Rv)–14.7[6] km/s
Proper motion (μ) RA: +22.09[1] mas/yr
Dec.: –186.51[1] mas/yr
Parallax (π)33.69 ± 0.42 mas[1]
Distance97 ± 1 ly
(29.7 ± 0.4 pc)
Absolute magnitude (MV)3.42[2]
Position (relative to HD 49933 A)[5]
ComponentHD 49933 B
Epoch of observation2016
Angular distance6.5″
Position angle23°
Projected separation190 AU
Details
Mass1.079 ± 0.073[7] M☉
Radius1.385 ± 0.031[7] R☉
Luminosity3.47 ± 0.18[7] L☉
Surface gravity (log g)4.08[8] cgs
Temperature6,598[8] K
Metallicity [Fe/H]–0.29[8] dex
Rotational velocity (v sin i)10[9] km/s
Age2.4[2] Gyr
Other designations
BD−00 1462, HD 49933, HIP 32851, HR 2530, SAO 133760.[10]
Database references
SIMBADdata

HD 49933 (HR 2530) is a binary star system in the equatorial constellation of Monoceros, the unicorn. The HD designation indicates the identifier of the star found in the Henry Draper catalogue. At an apparent magnitude of 5.8,[2] this star can just be seen with the naked eye under suitably dark conditions. Based upon parallax measurements from the Hipparcos mission,[11] the distance to HD 49933 is about 97 light-years (30 parsecs) with a 1% margin of error.

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