| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h41m 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] |
| Distance | 57.1 ± 0.7 ly (17.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.57[5] |
| Details[6] | |
| Mass | 1.368±0.026[2] M☉ |
| Radius | 1.26[7] R☉ |
| Luminosity | 3.31 L☉ |
| Surface gravity (log g) | 4.29 cgs |
| Temperature | 6,704±63 K |
| Rotational velocity (v sin i) | 71.6[2] km/s |
| Age | 1.11±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 | |
| SIMBAD | data |
HD 139664 is a single[9] star in the southern constellationofLupus. 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]
Adebris disk has been imaged around this star using the coronagraphic mode of the ACS instrument on the Hubble Space Telescope. The disk appears to have a dust maximum at 83 AU from the star and a sharp outer boundary at 109 AU. These features may be caused by gravitational perturbations from planets orbiting the star.[12]
