Tau2 Serpentis

For other stars with this Bayer designation, see Tau Serpentis.
τ2 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 32m 09.6751s[1]
Declination +16° 03 22.208[1]
Apparent magnitude (V) 6.218[1]
Characteristics
Spectral type B9V[1]
U−B color index −0.23[2]
B−V color index −0.05[2]
Astrometry
Radial velocity (Rv)−18 ± 5[1] km/s
Proper motion (μ) RA: −2.87[1] mas/yr
Dec.: 6.76[1] mas/yr
Parallax (π)7.56 ± 0.80[1] mas
Distanceapprox. 430 ly
(approx. 130 pc)
Absolute magnitude (MV)0.6[3]
Details
Radius2.7[4] R
Rotational velocity (v sin i)175[2] km/s
Other designations
τ2 Ser, Tau2 Serpentis, Tau2 Ser, 12 Serpentis, 12 Ser, BD+16 2797, GC 20880, HD 138527, HIP 76069, HR 5770, PPM 131484, SAO 101600.[1]
Database references
SIMBADdata

Tau2 Serpentis (Tau2 Ser, τ2 Serpentis, τ2 Ser) is a B-type main sequence star in the constellation of Serpens, approximately 430 light-years from Earth. It has an apparent visual magnitude of approximately 6.218.[1]

References

  1. 1 2 3 4 5 6 7 8 9 10 * 12 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. 1 2 3 HR 5770, 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.
  3. From apparent magnitude and parallax.
  4. HD 138527, 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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