Tau4 Serpentis

:"For other stars with this Bayer designation, see Tau Serpentis."Starbox begin
name = τ⁴ SerpentisStarbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Serpens
ra = RA|15|36|28.1873SIMBAD link|tau4+ser|V* tau04 Ser -- Pulsating variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.]
dec = DEC|+15|06|05.128
appmag_v=5.89 to 7.07tau 4 Ser, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 19, 2008.] Starbox character
class = M5II-III
b-v = 1.2
variable = SRBStarbox astrometry
radial_v = −26 ± 5
prop_mo_ra = −3.41
prop_mo_dec = 9.55
parallax = 6.27
p_error = 1.00
parallax_footnote =
absmag_v= 0.5 [From apparent magnitude and parallax.] Starbox catalog
names=τ⁴ Ser, Tau⁴ Serpentis, Tau⁴ Ser, 17 Serpentis, 17 Ser, τ⁴ Serpentis, τ⁴ Ser, Tau⁴ Serpentis, Tau⁴ Ser, BD+15 2890, GC 20983, HD 139216, HIP 76423, PPM 131543, SAO 101641.Starbox reference
Simbad=tau4+ser

Tau⁴ Serpentis (Tau⁴ Ser / τ⁴ Serpentis / τ⁴ Ser) is a M-type bright giant star in the constellation of Serpens, approximately 520 light-years from the Earth. It is classified as a semiregular late-type variable star, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days. τ⁴ is unique among the stars with the Bayer designation τ Serpentis as being the only one with no HR catalog number.

References