136 Tauri

136 Tauri

Location within Taurus
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 53m 19.64606s[1]
Declination +27° 36′ 44.1378″[1]
Apparent magnitude (V) 4.56[2]
Characteristics
Spectral type A0 V[3] (A0 V + A0 V)[2]
B−V color index −0.008±0.009[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−17.2±4.2[5] km/s
Proper motion (μ) RA: +3.72[1] mas/yr
Dec.: −10.11[1] mas/yr
Parallax (π)7.71 ± 0.22 mas[1]
Distance420 ± 10 ly
(130 ± 4 pc)
Absolute magnitude (MV)−1.00[2]
Orbit[6]
Period (P)5.969 d
Eccentricity (e)0.00
Periastron epoch (T)2,420,147.25±10.0 JD
Argument of periastron (ω)
(secondary)		0.00°
Semi-amplitude (K1)
(primary)		48.9 km/s
Semi-amplitude (K2)
(secondary)		71.0 km/s
Details
136 Tau A
Radius2.1[7] R☉
Luminosity197.19[8] L☉
Temperature8,732[8] K
Rotational velocity (v sin i)10[9] km/s
Other designations
136 Tau, BD+27° 899, HD 39357, HIP 27830, HR 2034, SAO 77675[10]
Database references
SIMBADdata

136 Tauri is a white-hued binary star system in the zodiac constellation of Taurus. It has a combined apparent visual magnitude of 4.56,[2] which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 7.71±0.22 mas as seen from Earth's orbit,[1] it is located approximately 420 light years from the Sun. The system is moving nearer with a heliocentric radial velocity of −17.2 km/s,[5] and is expected to make its closest approach in 6.5 million years at a distance of 150 ly (45 pc).[2]

This is a close, double-lined spectroscopic binary with an orbital period of 5.96 days and an eccentricity of 0.00.[6] Tidal effects between the pair may have circularized their orbit and slowed their rotation rates – the primary has a projected rotational velocity of 10 km/s.[9] They have a combined stellar classification of A0 V,[3] and both are most likely A-type main-sequence stars of the same class.[2]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference DeBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Luyten1936 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Abt2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).