Wikipedia
Tau7 Serpentis
Tau7 Serpentis, Latinized from τ7 Serpentis, is an A-type star in the constellation of Serpens, approximately 174 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 5.804.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 41m 54.7132s[1] |
| Declination | +18° 27′ 50.532″[1] |
| Apparent magnitude (V) | 5.804[1] |
| Characteristics | |
| Spectral type | A8Vam[2] |
| U−B color index | +0.11[3] |
| B−V color index | +0.20[3] |
| R−I color index | +0.10[3] |
| Astrometry | |
| Radial velocity (Rv) | −29.5±2[1] km/s |
| Proper motion (μ) | RA: −73.00[1] mas/yr Dec.: +56.85[1] mas/yr |
| Parallax (π) | 18.78 ± 0.82 mas[1] |
| Distance | 174 ± 8 ly (53 ± 2 pc) |
| Absolute magnitude (MV) | +2.18[4] |
| Details | |
| Luminosity | 11[4] L☉ |
| Rotational velocity (v sin i) | 20[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References Edit
- ^ a b c d e f g h i j * 22 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- ^ Barry, Don C. (1970). "Spectral Classification of a and F Stars". Astrophysical Journal Supplement. 19: 281. Bibcode:1970ApJS...19..281B. doi:10.1086/190209.
- ^ a b c d HR 5845, 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.
- ^ a b 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.