HD 156768

HD 156768
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
A
Right ascension 17h 22m 55.22140s[1]
Declination −58° 00′ 37.1789″[1]
Apparent magnitude (V) 6.1[2]
B
Right ascension 17h 22m 55.20446s[3]
Declination −58° 00′ 38.9718″[3]
Apparent magnitude (V) 9.6[2]
Characteristics
A
Spectral type G8Ib/II[4]
U−B color index +0.86[5]
B−V color index +1.07[5]
B
B−V color index +0.39[6]
Astrometry
A
Radial velocity (Rv)−9.42±0.13[1] km/s
Proper motion (μ) RA: −5.959[1] mas/yr
Dec.: −15.651[1] mas/yr
Parallax (π)3.1386 ± 0.0412 mas[1]
Distance1,040 ± 10 ly
(319 ± 4 pc)
Absolute magnitude (MV)−1.69[7]
B
Radial velocity (Rv)−9.80±0.20[8] km/s
Proper motion (μ) RA: −6.006[3] mas/yr
Dec.: −14.316[3] mas/yr
Parallax (π)2.9305 ± 0.0404 mas[3]
Distance1,110 ± 20 ly
(341 ± 5 pc)
Details
HD 156768 A
Mass4.5[1] M☉
Radius37[1] R☉
Luminosity527[1] L☉
Surface gravity (log g)1.76[1] cgs
Temperature4,580[1] K
Rotational velocity (v sin i)2.6±1.0[9] km/s
HD 156768 B
Mass1.6[10] M☉
Surface gravity (log g)3.79[10] cgs
Temperature6,592[10] K
Metallicity [Fe/H]−0.11[10] dex
Other designations
CPD−57°8478, HD 156768, HIP 85049, HR 6438, SAO 244678
Database references
SIMBADdata

HD 156768 is a double star in the southern constellation of Ara, with a combined apparent magnitude of 5.86.[11] The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II.[4] The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.[2]

  1. ^ a b c d e f g h i j k Cite error: The named reference dr3a was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aaa356_141 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference dr3b 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 aass34_1 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference tycho was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference xhip was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference kharchenko2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa395_97 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference starhorse2 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference gontcharov was invoked but never defined (see the help page).