H Scorpii

H Scorpii

H Scorpii and the dark clouds Barnard 231
Credit: DECaPS DR2
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 16h 36m 22.47192s[1]
Declination −35° 15′ 19.1803″[1]
Apparent magnitude (V) 4.18[2]
Characteristics
Evolutionary stage giant[3]
Spectral type K6III[4]
B−V color index 1.535±0.069[2]
Astrometry
Radial velocity (Rv)−2.10±0.7[5] km/s
Proper motion (μ) RA: 15.61±0.17 mas/yr[1]
Dec.: 11.33±0.14 mas/yr[1]
Parallax (π)9.52 ± 0.16 mas[1]
Distance343 ± 6 ly
(105 ± 2 pc)
Absolute magnitude (MV)−0.84±0.037[6]
Details
Mass1.06+0.74
−0.28 M☉[7]
1.81[8] M☉
Radius52.79±5.47[3] R☉
Luminosity389 L☉[7]
562 L☉[8]
582±147[3] L☉
Surface gravity (log g)1.30±0.15[3] cgs
Temperature3,875±21[8] K
Metallicity [Fe/H]0.00±0.20 dex[3]
−0.30[7] dex
Rotational velocity (v sin i)3.1[9] km/s
Age2.18[8] Gyr
Other designations
H Sco, NSV 7844, CD−34° 11112, GC 22311, HD 149447, HIP 81304, HR 6166, SAO 207814, PPM 295235[10]
Database references
SIMBADdata

H Scorpii (H Sco) is a single[11] star in the southern constellation Scorpius. It is faintly visible to the naked eye with an apparent visual magnitude of 4.18.[2] The star is located at a distance of approximately 343 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2 km/s.[5] This star was initially given the Bayer designation Beta Normae by Lacaille but it was later reassigned from Norma to Scorpius.[12]

This is an aging giant star with a stellar classification of K6III.[4] After exhausting the supply of hydrogen at its core, this star cooled and expanded off the main sequence. It now has around 53 times the radius of the Sun.[3] The star is about 2.2[8] billion years old with only a mild level of magnetic activity, and is spinning with a projected rotational velocity of 3.1 km/s.[9] It is radiating 4–600 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,875 K.[8]

  1. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Decin_et_al_2003 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 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 park2013 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Charbonnel_et_al_2020 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Pérez_Martínez_et_al_2014 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 Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Ridpath was invoked but never defined (see the help page).