Tau2 Serpentis
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Serpens |
Right ascension | 15h 32m 09.6751s[1] |
Declination | +16° 03′ 22.208″[1] |
Apparent magnitude (V) | 6.218[1] |
Characteristics | |
Spectral type | B9V[1] |
U−B color index | −0.23[2] |
B−V color index | −0.05[2] |
Astrometry | |
Radial velocity (Rv) | −18 ± 5[1] km/s |
Proper motion (μ) | RA: −2.87[1] mas/yr Dec.: 6.76[1] mas/yr |
Parallax (π) | 7.56 ± 0.80[1] mas |
Distance | approx. 430 ly (approx. 130 pc) |
Absolute magnitude (MV) | +0.44[3] |
Details | |
Radius | 2.7[4] R☉ |
Luminosity | 74[3] L☉ |
Rotational velocity (v sin i) | 175[2] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Tau2 Serpentis, Latinized from τ2 Serpentis, is a B-type main sequence star in the constellation of Serpens, approximately 430 light-years from Earth. It has an apparent visual magnitude of approximately 6.218.[1] This is a Lambda Boötis star.[3]
References
- 1 2 3 4 5 6 7 8 9 10 * 12 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- 1 2 3 HR 5770, 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.
- 1 2 3 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.
- ↑ HD 138527, 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.
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