Xi Aquilae
Red-clump giant star in the constellation Aquila / From Wikipedia, the free encyclopedia
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Xi Aquilae (ξ Aquilae, abbreviated Xi Aql, ξ Aql), officially named Libertas /ˈlɪbərtæs/,[10] is a red-clump giant star located at a distance of 186 light-years (57 parsecs) from the Sun in the equatorial constellation of Aquila. As of 2008, an extrasolar planet (designated Xi Aquilae b, later named Fortitudo) has been confirmed in orbit around the star.[11]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Aquila |
Right ascension | 19h 54m 14.8815s[1] |
Declination | +08° 27′ 41.235″[1] |
Apparent magnitude (V) | 4.722[2] |
Characteristics | |
Spectral type | G9.5 IIIb[3] |
U−B color index | +0.89[4] |
B−V color index | +1.049[5] |
R−I color index | 0.57 |
Astrometry | |
Radial velocity (Rv) | −42.10 ± 0.14[5] km/s |
Proper motion (μ) | RA: 101.694(107) mas/yr[1] Dec.: −81.141(77) mas/yr[1] |
Parallax (π) | 17.5183 ± 0.1006 mas[1] |
Distance | 186 ± 1 ly (57.1 ± 0.3 pc) |
Absolute magnitude (MV) | +0.96[6] |
Details | |
Mass | 1.16 ± 0.28[7] M☉ |
Radius | 10.45 ± 0.18[8] R☉ |
Luminosity | 49[7] L☉ |
Surface gravity (log g) | 2.66[7] cgs |
Temperature | 4,783[7] K |
Metallicity [Fe/H] | −0.13[7] dex |
Rotational velocity (v sin i) | 5.2[5] km/s |
Age | 4.63 ± 2.88[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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