HD 142250
Star in the constellation of Scorpius / From Wikipedia, the free encyclopedia
HD 142250 (HR 5910, HIP 77900) is a star in the constellation Scorpius. It has a visual apparent magnitude of 6.1, being visible to the naked eye only in excellent seeing conditions. From parallax measurements, it is located 486 light-years (149 parsecs) away from Earth. This distance, together with the star's proper motion, indicate that HIP 77900 is a member of the Upper Scorpius subgroup of the Scorpius–Centaurus association, the nearest OB association to the Sun.[11] This subgroup is the youngest of the three of the association, with an estimated age of 11 million years.[9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 15h 54m 30.109s[1] |
Declination | −27° 20′ 19.09″[1] |
Apparent magnitude (V) | 6.1[2] |
Characteristics | |
Spectral type | B6Vp[3] |
U−B color index | −0.44[4] |
B−V color index | −0.07[4] |
Astrometry | |
Radial velocity (Rv) | −1.3[5] km/s |
Proper motion (μ) | RA: −13.181[1] mas/yr Dec.: −25.183[1] mas/yr |
Parallax (π) | 6.7131 ± 0.0263 mas[1] |
Distance | 486 ± 2 ly (149.0 ± 0.6 pc) |
Absolute magnitude (MV) | −0.1[6] |
Absolute bolometric magnitude (Mbol) | −0.72±0.20[7] |
Details | |
Mass | 3.74±0.10[3] M☉ |
Radius | 2.7 R☉ |
Luminosity | 220+38 −33[3] L☉ |
Surface gravity (log g) | 4.32[6] cgs |
Temperature | 13,646±94[3] K |
Rotational velocity (v sin i) | 34.0±1.3[8] km/s |
Age | 11±2[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a B-type main-sequence star with a spectral type of B6Vp and a mass estimated at 3.7 times the solar mass.[3] HIP 77900 is a helium-weak chemically peculiar star, and has a magnetic field and a slow rate of rotation, with a projected rotational velocity (v sin i) of 34 km/s.[8][4] Its photosphere is radiating light with a luminosity 220 times greater the Sun's at an effective temperature of 13,600 K.[3]