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Star in the constellation Lupus From Wikipedia, the free encyclopedia
2 Lupi is a single[7] star in the southern constellation of Lupus,[6] located 326 light-years away from the Sun.[1] It has the Bayer designation f Lupi; 2 Lupi is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.33.[2] It is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 15h 17m 49.83809s[1] |
Declination | −30° 08′ 55.2165″[1] |
Apparent magnitude (V) | 4.33[2] |
Characteristics | |
Evolutionary stage | giant |
Spectral type | K0 IIIa CH-1[3] |
B−V color index | 1.100±0.004[4] |
Astrometry | |
Radial velocity (Rv) | −2.91±0.15[5] km/s |
Proper motion (μ) | RA: −10.16[1] mas/yr Dec.: −3.66[1] mas/yr |
Parallax (π) | 10.01 ± 0.21 mas[1] |
Distance | 326 ± 7 ly (100 ± 2 pc) |
Absolute magnitude (MV) | −0.65[4] |
Details | |
Radius | 11.0+0.7 −0.8[5] R☉ |
Luminosity | 65.6±0.8[5] L☉ |
Surface gravity (log g) | 2.84[2] cgs |
Temperature | 4,953+197 −148[5] K |
Metallicity [Fe/H] | 0.11[2] dex |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging giant star with a stellar classification of K0 IIIa CH-1.[3] The suffix notation indicates abnormally weak lines of carbyne. Having exhausted the hydrogen at its core, the star evolved away from the main sequence by expanding to 11[5] times the Sun's radius. The star is radiating 65.6[5] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,953 K.[5] It is a suspected variable star of unknown type.[8]
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