HD 139664

HD 139664

ACS image of debris disk around HD 139664
Credit: NASA/ESA
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 41m 11.3774s[1]
Declination −44° 39′ 40.338″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type F3/5V[3]
U−B color index −0.03[4]
B−V color index +0.413[2]
R−I color index +0.20[4]
Astrometry
Radial velocity (Rv)−7.08±0.03[2] km/s
Proper motion (μ) RA: −168.70[1] mas/yr
Dec.: −265.69[1] mas/yr
Parallax (π)57.09 ± 0.72 mas[1]
Distance57.1 ± 0.7 ly
(17.5 ± 0.2 pc)
Absolute magnitude (MV)3.57[5]
Details[6]
Mass1.368±0.026[2] M☉
Radius1.26[7] R☉
Luminosity3.31 L☉
Surface gravity (log g)4.29 cgs
Temperature6,704±63 K
Rotational velocity (v sin i)71.6[2] km/s
Age1.11±1.40 Gyr
Other designations
g Lupi, CD−44° 10310, CPD−44° 7529, GC 21070, GJ 594, HD 139664, HIP 76829, HR 5825, SAO 226064, PPM 320883, LTT 6256, NLTT 40843[8]
Database references
SIMBADdata

HD 139664 is a single[9] star in the southern constellation of Lupus. It has the Bayer designation g Lupi; HD 139664 is the star's identifier from the Henry Draper Catalogue.[8] It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 4.64. The star is located at a distance of 57 light years from the Sun based on parallax,[1] and it is drifting closer with a radial velocity of −7 km/s.[2] It is a member of the Hercules-Lyra Association of co-moving stars.[10][2]

This is an F-type main-sequence star with a stellar classification of F3/5V,[3] which indicates it is generating energy through core hydrogen fusion. The estimated age is poorly constrained at around one billion years,[6] but the age of the Hercules-Lyra Association to which it belongs is 257±46 million years.[11] It has a moderately high rate of spin, showing a projected rotational velocity of 71.6 km/s.[2] The star has 1.37[2] times the mass of the Sun and 1.26[7] times the Sun's radius. It is radiating 3.31 times the luminosity of the Sun from its photosphere at an effective temperature of 6,704 K.[6]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Desidera2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference bsc1 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Luck2018 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Rhee2007 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Lopez-Santiago2006 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eisenbeiss2013 was invoked but never defined (see the help page).