Tau1 Serpentis

τ1 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
Distanceapprox. 900 ly
(approx. 280 pc)
Absolute magnitude (MV)−1.45[4]
Details
Radius54[5] R☉
Other designations
τ1 Ser, 9 Serpentis, BD+15° 2858, FK5 570, GC 20740, HD 137471, HIP 75530, HR 5739, SAO 101545[1]
Database references
SIMBADdata

Tau1 Serpentis, Latinized from τ1 Serpentis, 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. 1 2 3 4 5 6 7 8 9 NSV 7074 -- Variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. 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.
  3. 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.
  4. ↑ 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.
  5. ↑ 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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