Tau8 Serpentis

Tau8 Serpentis, Latinized from τ8 Serpentis, is an A-type main sequence star in the constellation of Serpens, approximately 320 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 6.144.[1] Although it was observed to be binary by speckle interferometry in 1985, subsequent observations show no sign of binarity, and the detection appears to have been spurious.[5]

τ8 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 44m 42.1323s[1]
Declination +17° 15 51.197[1]
Apparent magnitude (V) 6.144[1]
Characteristics
Spectral type A0V[1]
U−B color index −0.03[2]
B−V color index 0.00[2]
Astrometry
Radial velocity (Rv)−5.2 ± 5[1] km/s
Proper motion (μ) RA: −30.44[1] mas/yr
Dec.: 6.59[1] mas/yr
Parallax (π)10.16 ± 0.79[1] mas
Distance320 ± 20 ly
(98 ± 8 pc)
Absolute magnitude (MV)0.88[3]
Details
Radius2.0[4] R
Rotational velocity (v sin i)76[2] km/s
Other designations
τ8 Ser, 26 Serpentis, BD+17° 2906, GC 21164, HD 140729, HIP 77111, HR 5858, SAO 101712, PPM 131656[1]


τ8 Ser, Tau8 Serpentis, Tau8 Ser, 26 Serpentis, 26 Ser, BD+17 2906, GC 21164, HD 140729, HIP 77111, HR 5858, PPM 131656, SAO 101712.
Database references
SIMBADdata

References

  1. * 26 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. HR 5858, 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. 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.
  4. HD 140729, 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.
  5. ICCD speckle observations of binary stars. X - A further survey for duplicity among the bright stars, Harold A. McAlister, Brian D. Mason, William I. Hartkopf, and Michael M. Shara, Astronomical Journal 106, #4 (October 1993), pp. 1639–1655, doi:10.1086/116753, Bibcode:1993AJ....106.1639M.


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