Theta Leonis

θ Leonis
Location of θ Leonis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
Right ascension 11h 14m 14.40446s[1]
Declination +15° 25′ 46.4541″[1]
Apparent magnitude (V) +3.324[2]
Characteristics
Spectral type A2 V[3]
U−B color index +0.07[2]
B−V color index –0.02[2]
Astrometry
Radial velocity (Rv)+7.6[4] km/s
Proper motion (μ) RA: -60.31[1] mas/yr
Dec.: -79.10[1] mas/yr
Parallax (π)19.76 ± 0.17 mas[1]
Distance165 ± 1 ly
(50.6 ± 0.4 pc)
Absolute magnitude (MV)−0.19[5]
Details[6]
Mass2.8±0.1 M☉
Radius4.03±0.10 R☉
Luminosity118±5 L☉
Surface gravity (log g)3.65[7] cgs
Temperature9,480±120 K
Metallicity [Fe/H]+0.05[7] dex
Rotational velocity (v sin i)23[8] km/s
Age407±12 Myr
Other designations
Chertan, Chort, Coxa, θ Leo, Theta Leo, 70 Leo, HR 4359, BD+16 2234, HD 97633, SAO 99512, FK5 423, HIP 54879.[9]
Database references
SIMBADdata

Theta Leonis, Latinized from θ Leonis, formally named Chertan,[10] is a star in the constellation of Leo. With an apparent visual magnitude of +3.324[2] it is visible to the naked eye and forms one of the brighter stars in the constellation. The distance from the Sun can be directly determined from parallax measurements, yielding a value of about 165 light-years (51 parsecs).[1]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Maestro2013 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa274_2_335 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa463_2_671 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. ^ "List of IAU-approved Star Names". Retrieved 17 January 2023.