Tau1 Serpentis

For other stars with this Bayer designation, see Tau 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)−2.1[4]
Details
Radius54[5] R
Other designations
τ1 Ser, Tau1 Serpentis, Tau1 Ser, 9 Serpentis, 9 Ser, BD+15 2858, FK5 570, GC 20740, HD 137471, HIP 75530, HR 5739, PPM 131392, SAO 101545.[1]
Database references
SIMBADdata

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. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 NSV 7074 -- Variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. 2.0 2.1 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. 3.0 3.1 3.2 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. From apparent magnitude and parallax.
  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.