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Star in the constellation Serpens From Wikipedia, the free encyclopedia
Tau8 Serpentis, Latinized from τ8 Serpentis, is an A-type main sequence star in the constellation of Serpens, approximately 320 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 6.144.[1] Although it was observed to be binary by speckle interferometry in 1985, subsequent observations show no sign of binarity, and the detection appears to have been spurious.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Serpens |
Right ascension | 15h 44m 42.1323s[1] |
Declination | +17° 15′ 51.197″[1] |
Apparent magnitude (V) | 6.144[1] |
Characteristics | |
Spectral type | A0V[1] |
U−B color index | −0.03[2] |
B−V color index | 0.00[2] |
Astrometry | |
Radial velocity (Rv) | −5.2 ± 5[1] km/s |
Proper motion (μ) | RA: −30.44[1] mas/yr Dec.: 6.59[1] mas/yr |
Parallax (π) | 10.16 ± 0.79 mas[1] |
Distance | 320 ± 20 ly (98 ± 8 pc) |
Absolute magnitude (MV) | 0.88[3] |
Details | |
Radius | 2.0[4] R☉ |
Rotational velocity (v sin i) | 76[2] km/s |
Other designations | |
τ8 Ser, Tau8 Ser, 26 Serpentis, BD+17° 2906, GC 21164, HD 140729, HIP 77111, HR 5858, SAO 101712, PPM 131656[1] | |
Database references | |
SIMBAD | data |
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