7 Tauri

7 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
A
Right ascension 03h 34m 26.629s[1]
Declination +35° 27′ 51.86″[1]
Apparent magnitude (V) 6.58[2]
B
Right ascension 03h 34m 26.633s[3]
Declination +35° 27′ 52.17″[3]
Apparent magnitude (V) 6.84[2]
Characteristics
A
Spectral type A3V[4]
B−V color index +0.13[4]
B
Spectral type A3V[4]
B−V color index +0.13[4]
Astrometry
Radial velocity (Rv)+28.1[5] km/s
Proper motion (μ) RA: +9.908 mas/yr[1]
Dec.: −28.201 mas/yr[1]
Parallax (π)5.4993 ± 0.0587 mas[1]
Distance593 ± 6 ly
(182 ± 2 pc)
Absolute magnitude (MV)+0.5/+0.6[4]
Orbit[6]
Period (P)522.16 yr
Semi-major axis (a)0.625″
Eccentricity (e)0.679
Details
A
Mass2.5[4] M☉
Radius9.0[7] R☉
Luminosity52[7] L☉
Temperature8,551[8] K
B
Mass2.5[4] M☉
Other designations
7 Tau, BD+23°473, HD 22091, HIP 16664, HR 1086[9]
Database references
SIMBADdata

7 Tauri is a multiple star in the northern constellation of Taurus. It has a combined apparent visual magnitude of 5.95,[10] so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Gaia spacecraft show an annual parallax shift of 5.5 mas, which is equivalent to a distance of around 593 light years from the Sun.

7 Tauri is a binary star with two nearly equal components about 0.7″ apart, designated as A and B. The spectrum of each star matches a stellar classification of A7V.[4] 22″ away is a 10th-magnitude star, component C, which is itself a spectroscopic binary. In the past, these stars had been treated as a single system, but they are now known to have different proper motions and somewhat different distances.[4]

  1. ^ a b c d Cite error: The named reference dr3a was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference tycho was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference dr3b was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i Cite error: The named reference tokovinin1998 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference malkov2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference dr2a was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ticv8 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 xhip was invoked but never defined (see the help page).