Tau7 Serpentis

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τ7 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 41m 54.7132s[1]
Declination +18° 27′ 50.532″[1]
Apparent magnitude (V) 5.804[1]
Characteristics
Spectral type A8Vam[2]
U−B color index +0.11[3]
B−V color index +0.20[3]
R−I color index +0.10[3]
Astrometry
Radial velocity (Rv) −29.5±2[1] km/s
Proper motion (μ) RA: −73.00[1] mas/yr
Dec.: +56.85[1] mas/yr
Parallax (π) 18.78 ± 0.82[1] mas
Distance 174 ± 8 ly
(53 ± 2 pc)
Absolute magnitude (MV) +2.18[4]
Details
Luminosity 11[4] L
Rotational velocity (v sin i) 20[3] km/s
Other designations
τ7 Ser, 22 Serpentis, BD+18° 3059, GC 21111, HD 140232, HIP 76878, HR 5845, SAO 101686, PPM 131613, WDS J15419+1828AB[1]
Database references
SIMBAD data

Tau7 Serpentis, Latinized from τ7 Serpentis, is an A-type star in the constellation of Serpens, approximately 174 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 5.804.[1]

References[edit]

  1. ^ a b c d e f g h i j * 22 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
  2. ^ Barry, Don C. (1970). "Spectral Classification of a and F Stars". Astrophysical Journal Supplement. 19: 281. Bibcode:1970ApJS...19..281B. doi:10.1086/190209. 
  3. ^ a b c d HR 5845, 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. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.