Tau1 Serpentis

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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]
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]
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]
Radius 54[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

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]


  1. ^ a b c d e f g h i NSV 7074 -- Variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. ^ a b 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. ^ a b c 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.