Taygeta

Taygeta

Template:Location mark Taygeta in the Pleiades cluster (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Taurus
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.30
Characteristics
Evolutionary stage	subgiant
Spectral type	B6IV + ?
U−B Template:Engvar	−0.48
B−V Template:Engvar	−0.12
Astrometry
Radial velocity (Rv)	10.1 km/s
Proper motion (μ)	RA:  mas/yr Dec.:  mas/yr
Parallax (π)	7.97±0.33 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Details
Taygeta
Mass	Template:Solar mass
Radius	Template:Solar radius
Luminosity	600 Template:Solar luminosity
Surface gravity (log g)	cgs
Temperature	K
Rotational velocity (v sin i)	km/s
19 Tauri Ab
Mass	3.2 Template:Solar mass
Luminosity	150 Template:Solar luminosity
Surface gravity (log g)	4.2 cgs
Temperature	8,306 K
Metallicity [Fe/H]	dex
Other designations
q Tauri, 19 Tauri, HR 1145, HD 23338, BD+24°547, HIP 17531, SAO 76140, GC 4486, BDS 1848, CCDM 03452+2429
Database references
SIMBAD	data

Template:Sky Taygeta is a double star in the constellation of Taurus and a member of the Pleiades open star cluster (M45).

It consists of a binary pair designated 19 Tauri A together with a single star visual companion, 19 Tauri B. 'A's' two components are themselves designated 19 Tauri Aa (officially named Taygeta Template:IPAc-en, the traditional name for the entire system) and Ab.

Based on parallax measurements obtained during the Hipparcos mission, Taygeta is approximately 410 light-years from the Sun.

Nomenclature

19 Tauri is the system's Flamsteed designation. It also bears the little-used Bayer designation q Tauri. The designations of the two constituents as 19 Tauri A and B, and those of A's components - 19 Tauri Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).

The system bore the traditional name Taygeta (or Taygete). Taygete was one of the Pleiades sisters in Greek mythology. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Taygeta for the component 19 Tauri Aa on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.

Properties

Taygeta has an apparent magnitude of +4.30 and presents as a blue-white B-type subgiant. It has been used as a standard star for that spectral type. It is a spectroscopic binary, whose component stars have magnitudes of +4.6 and +6.1. They are separated by 0.012 arcseconds and complete one orbit every 1313 days. The subgiant primary is one of just a handful of stars in the young Pleiades cluster that have evolved away from the main sequence.

The 8th magnitude visual companion, 19 Tauri B, is 69 arcseconds away. It is thought to be a yellow star somewhat more massive and larger than the Sun, and further away than the Pleiades cluster.

Taygeta was once reported to be variable, but has since been measured to be very nearly constant.