Tau8 Serpentis
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 |
References
- * 26 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- HR 5858, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 19, 2008.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- HD 140729, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line September 19, 2008.
- ICCD speckle observations of binary stars. X - A further survey for duplicity among the bright stars, Harold A. McAlister, Brian D. Mason, William I. Hartkopf, and Michael M. Shara, Astronomical Journal 106, #4 (October 1993), pp. 1639–1655, doi:10.1086/116753, Bibcode:1993AJ....106.1639M.
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