Tau6 Serpentis

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τ6 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension  15h 40m 59.1008s[1]
Declination +16° 01′ 28.517″[1]
Apparent magnitude (V) 6.000[1]
Spectral type G8III[1]
U−B color index +0.61[2]
B−V color index +0.90[2]
R−I color index +0.46[2]
Radial velocity (Rv)3.4 ± 0.9[1] km/s
Proper motion (μ) RA: 22.16[1] mas/yr
Dec.: −16.80[1] mas/yr
Parallax (π)7.24 ± 0.79[1] mas
Distanceapprox. 450 ly
(approx. 140 pc)
Absolute magnitude (MV)−0.33[3]
Radius11[4] R
Luminosity150[3] L
Metallicity [Fe/H]−0.08±0.04[3] dex
Other designations
τ6 Ser, 19 Serpentis, BD+16° 2816, GC 21089, HD 140027, HIP 76810, HR 5840, SAO 101678, PPM 131601

τ6 Ser, Tau6 Serpentis, Tau6 Ser, 19 Serpentis, 19 Ser, BD+16 2816, GC 21089, HD 140027, HIP 76810, HR 5840, PPM 131601, SAO 101678.[1]
Database references

Tau6 Serpentis, Latinized from τ6 Serpentis, is a G-type giant star in the constellation of Serpens, approximately 450 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 6.000,[1] and is a member of the Ursa Major Stream.[2]


  1. ^ a b c d e f g h i j k * 19 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. ^ a b c d HR 5840, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed September 19, 2008.
  3. ^ a b c 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.
  4. ^ HD 140027, 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.