Tau1 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 25m 47.3967s[1] |
| Declination | +15° 25′ 40.930″[1] |
| Apparent magnitude (V) | 5.13 to 5.20[2] |
| Characteristics | |
| Spectral type | M1III[1] |
| U−B color index | +1.95[3] |
| B−V color index | +1.66[3] |
| R−I color index | +1.04[3] |
| Astrometry | |
| Radial velocity (Rv) | −19.8 ± 0.9[1] km/s |
| Proper motion (μ) | RA: −14.02[1] mas/yr Dec.: −7.51[1] mas/yr |
| Parallax (π) | 3.55 ± 0.76[1] mas |
| Distance | approx. 900 ly (approx. 280 pc) |
| Absolute magnitude (MV) | −2.1[4] |
| Details | |
| Radius | 54[5] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau1 Serpentis (Tau1 Ser, τ1 Serpentis, τ1 Ser) is an M-type giant star in the constellation of Serpens, approximately 900 light-years from Earth.[1] It has an apparent visual magnitude which varies between 5.13 and 5.20.[2]
References
- 1 2 3 4 5 6 7 8 9 NSV 7074 -- Variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- 1 2 NSV 7074, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 19, 2008.
- 1 2 3 HR 5739, 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 137471, 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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