Delta2 Tauri

For other stars with this Bayer designation, see δ Tauri.
Delta2 Tauri
Location of δ2 Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
Right ascension 04h 24m 05.75985s[1]
Declination +17° 26′ 38.8583″[1]
Apparent magnitude (V) +4.80[2]
Characteristics
Spectral type A2 Vs[3]
U−B color index +0.12[2]
B−V color index +0.15[2]
Astrometry
Radial velocity (Rv)+37.1[4] km/s
Proper motion (μ) RA: +108.16[1] mas/yr
Dec.: −34.66[1] mas/yr
Parallax (π)20.21 ± 0.40 mas[1]
Distance161 ± 3 ly
(49.5 ± 1.0 pc)
Absolute magnitude (MV)+1.62[5]
Details
Mass1.79[6] M☉
Radius1.8[7] R☉
Luminosity27[8] L☉
Surface gravity (log g)4.15[4] cgs
Temperature7,997[4] K
Metallicity [Fe/H]+0.14[4] dex
Rotational velocity (v sin i)42[4] km/s
Age449[6] Myr
Other designations
δ2 Tau, 64 Tauri, BD+17°714, HD 27819, HIP 20542, HR 1380, SAO 93907[9]
Database references
SIMBADdata

Delta2 Tauri (δ2 Tauri) is a solitary,[10] white-hued star in the zodiac constellation of Taurus. Based upon an annual parallax shift of 20.21 mas as seen from Earth,[1] it is located roughly 161 light years distant from the Sun. It is separated from δ1 Tauri by 0.3° on the sky[11] and is faintly visible to the naked eye with an apparent visual magnitude of +4.80.[2] The star is considered a member of the Hyades cluster.[12]

At the estimated age of 449 million years,[6] this is an A-type main-sequence star with a stellar classification of A2 Vs,[3] where the 's' suffix indicates narrow (sharp) absorption lines. It has 1.8[6] times the mass of the Sun and about 1.8[7] times the Sun's radius. The star is radiating 27[8] times the Sun's luminosity from its photosphere at an effective temperature of 7,997 K.[4]

δ2 Tauri is a source of X-ray emission with a luminosity of 101.1×1020 W. Since A-type stars are not normally a source of X-rays, this emission may be coming from an unknown companion or from a line of sight source.[13]

  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 Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Paunzen2001 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Gebran2016 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Eggen1998 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference OMeara2016 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gebran2010 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).