Tau2 Serpentis
For other stars with this Bayer designation, see Tau 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) | 0.6[3] |
| Details | |
| Radius | 2.7[4] R☉ |
| Rotational velocity (v sin i) | 175[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau2 Serpentis (Tau2 Ser, τ2 Serpentis, τ2 Ser) 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]
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.
- ↑ From apparent magnitude and parallax.
- ↑ 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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