HD 142250

HIP 77900
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]
Distance486 ± 2 ly
(149.0 ± 0.6 pc)
Absolute magnitude (MV)−0.1[6]
Absolute bolometric
magnitude (Mbol)		−0.72±0.20[7]
Details
Mass3.74±0.10[3] M☉
Radius2.7 R☉
Luminosity220+38
−33[3] L☉
Surface gravity (log g)4.32[6] cgs
Temperature13,646±94[3] K
Rotational velocity (v sin i)34.0±1.3[8] km/s
Age11±2[9] Myr
Other designations
BD−26 11096, HD 142250, HIP 77900, HR 5910, SAO 183907[10]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e Cite error: The named reference dr3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference bsc was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference pulkovo was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deGeus1989 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Aller2013 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Wraight2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Pecaut2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference deZeeuw1999 was invoked but never defined (see the help page).