Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 52m 18.05045s [1] |
Declination | −05° 10′ 25.36617″ [1] |
Apparent magnitude (V) | 6.58 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | K3.5 V [3] |
B−V color index | 1.071±0.008 [2] |
Astrometry | |
Radial velocity (Rv) | −7.20±0.15 [4] km/s |
Proper motion (μ) |
RA: −543.616
[1]
mas/
yr Dec.: −3.491 [1] mas/ yr |
Parallax (π) | 114.2968 ± 0.0465 mas [1] |
Distance | 28.54 ± 0.01
ly (8.749 ± 0.004 pc) |
Absolute magnitude (MV) | 6.87 [5] |
Details | |
Mass | 0.79 [6] M☉ |
Radius | 0.73+0.01 −0.02 [1] R☉ |
Luminosity | 0.225 [1] L☉ |
Surface gravity (log g) | 4.64 [6] cgs |
Temperature | 4,712±8.5 [7] K |
Metallicity [Fe/H] | +0.01 [8] dex |
Rotational velocity (v sin i) | 5.5 [6] km/s |
Age | 1.88 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | A |
B |
HD 50281 is a star in the equatorial constellation of Monoceros. It is orange in hue with an apparent visual magnitude of 6.58, [2] which lies at or below the typical limit of visibility to the naked eye. The star is located at a distance of 28.5 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −7.2 km/s. [4]
This object is an ordinary K-type main-sequence star with a stellar classification of K3.5 V. [3] It is nearly two billion years old and is spinning with a projected rotational velocity of 5.5 km/s. [6] The metallicity of this star – what astronomers term the abundance of elements with atomic numbers greater than helium – is near solar. The star has 79% [6] of the mass of the Sun and 73% [1] of the Sun's radius. It is radiating 22.5% [1] of the luminosity of the Sun from its photosphere at an effective temperature of 4,712 K. [7]
A magnitude 10.16 common proper motion companion, [10] designated component B, is located at an angular separation of 58.8 ″ along a position angle of 181° from the primary, as of 2015. [10] This is a suspected binary star system [11] with components of individual visual magnitude 10.6 and 11.1, [10] and a class of M2.5 V. [12] The coordinates of this companion are a source of X-ray emission. [13] A third companion, magnitude 14.04 component C, lies at a separation of 9.6″ from component B. [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 52m 18.05045s [1] |
Declination | −05° 10′ 25.36617″ [1] |
Apparent magnitude (V) | 6.58 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | K3.5 V [3] |
B−V color index | 1.071±0.008 [2] |
Astrometry | |
Radial velocity (Rv) | −7.20±0.15 [4] km/s |
Proper motion (μ) |
RA: −543.616
[1]
mas/
yr Dec.: −3.491 [1] mas/ yr |
Parallax (π) | 114.2968 ± 0.0465 mas [1] |
Distance | 28.54 ± 0.01
ly (8.749 ± 0.004 pc) |
Absolute magnitude (MV) | 6.87 [5] |
Details | |
Mass | 0.79 [6] M☉ |
Radius | 0.73+0.01 −0.02 [1] R☉ |
Luminosity | 0.225 [1] L☉ |
Surface gravity (log g) | 4.64 [6] cgs |
Temperature | 4,712±8.5 [7] K |
Metallicity [Fe/H] | +0.01 [8] dex |
Rotational velocity (v sin i) | 5.5 [6] km/s |
Age | 1.88 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | A |
B |
HD 50281 is a star in the equatorial constellation of Monoceros. It is orange in hue with an apparent visual magnitude of 6.58, [2] which lies at or below the typical limit of visibility to the naked eye. The star is located at a distance of 28.5 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −7.2 km/s. [4]
This object is an ordinary K-type main-sequence star with a stellar classification of K3.5 V. [3] It is nearly two billion years old and is spinning with a projected rotational velocity of 5.5 km/s. [6] The metallicity of this star – what astronomers term the abundance of elements with atomic numbers greater than helium – is near solar. The star has 79% [6] of the mass of the Sun and 73% [1] of the Sun's radius. It is radiating 22.5% [1] of the luminosity of the Sun from its photosphere at an effective temperature of 4,712 K. [7]
A magnitude 10.16 common proper motion companion, [10] designated component B, is located at an angular separation of 58.8 ″ along a position angle of 181° from the primary, as of 2015. [10] This is a suspected binary star system [11] with components of individual visual magnitude 10.6 and 11.1, [10] and a class of M2.5 V. [12] The coordinates of this companion are a source of X-ray emission. [13] A third companion, magnitude 14.04 component C, lies at a separation of 9.6″ from component B. [10]