HD 131551

HD 131551
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 14h 59m 55.7597s[1]
Declination −75° 01′ 57.6124″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type B9 V[3]
U−B color index −0.19[4]
B−V color index −0.04[4]
Astrometry
Radial velocity (Rv)−7.6±1.7[5] km/s
Proper motion (μ) RA: −5.659[1] mas/yr
Dec.: −20.787[1] mas/yr
Parallax (π)6.198 ± 0.04 mas[1]
Distance526 ± 3 ly
(161 ± 1 pc)
Absolute magnitude (MV)+0.3[6]
Details
Mass2.84±0.06[7] M☉
Radius3.19[8] R☉
Luminosity100[9] L☉
Surface gravity (log g)3.86[8] cgs
Temperature10,651[9] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)141[11] km/s
Age254[10] Myr
Other designations
20 G. Apodis, CD−74° 947, CPD−74° 1281, GC 20110, HD 131551, HIP 73394, HR 5555, SAO 257219, WDS J14599-7502A
Database references
SIMBADdata

HD 131551 (HR 5555) is a solitary star in the southern constellation Apus. It has an apparent magnitude of 6.19,[2] allowing it to be faintly seen with the naked eye under ideal conditions. Located 526 light years away, the object is approaching the Sun with a heliocentric radial velocity of 7.6 km/s.[5]

HD 131551 has a stellar classification of B9 V, indicating that it is an ordinary B-type main-sequence star.[3] At present it has 2.84 times the mass of the Sun[7] and a radius of 3.19 R☉.[8] It shines at 100 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 10,651 K,[9] giving it a blue-white hue. This object is 254 million years old[10] – having completed 70.1%[7] of its main sequence lifetime – and is spinning rapidly with a projected rotational velocity of 141 km/s.[11] HD 131551 has a similar metallicity compared to the Sun.[10]

There is a 13th magnitude companion star at an angular separation of 34.5″ along a position angle of 123° (as of 2010).[12]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Hamdy1933 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Levato2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).