Tau⁷ Serpentis

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]

τ⁷ Serpentis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Serpens
Right ascension	15^h 41^m 54.7132^s[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
τ^7 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

References

1. * 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. 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. 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.