Theta Leporis

Theta Leporis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 06h 06m 09.32339s[1]
Declination −14° 56′ 06.9188″[1]
Apparent magnitude (V) 4.67[2]
Characteristics
Spectral type A0 V[3]
U−B color index +0.00[2]
B−V color index +0.05[2]
Astrometry
Radial velocity (Rv)+32.0[4] km/s
Proper motion (μ) RA: -17.61[1] mas/yr
Dec.: +12.79[1] mas/yr
Parallax (π)18.88 ± 0.54 mas[1]
Distance173 ± 5 ly
(53 ± 2 pc)
Absolute magnitude (MV)+1.05[5]
Details
Mass2.35±0.03[6] M☉
Luminosity41[6] L☉
Surface gravity (log g)4.12[7] cgs
Temperature10,453±355[7] K
Rotational velocity (v sin i)246[7] km/s
Age207[7] Myr
Other designations
θ Lep, 18 Lep, BD−14° 1331, FK5 2466, GC 7742, HD 41695, HIP 28910, HR 2155, SAO 151110[8]
Database references
SIMBADdata

Theta Leporis, Latinized from θ Leporis, is a solitary,[9] white-hued star in the southern constellation of Lepus. It has an apparent visual magnitude of 4.67,[2] making it bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 18.88 mas as measured from Earth,[1] the system is located roughly 173 light years from the Sun. The star made its closest approach about 1.6 million years ago when it came within 29 ly (9.0 pc) of the Sun.[10]

This is an ordinary A-type main-sequence star with a stellar classification of A0 V[3] and an age of about 207 million years.[7] It is rotating rapidly with a projected rotational velocity of 207 km/s.[7] This is giving the star an oblate shape with an equatorial bulge that is an estimated 10% larger than the polar radius.[11] It has an estimated 2.35[6] times the mass of the Sun and is radiating 41[6] times the Sun's luminosity from its photosphere at an effective temperature of around 10,453 K.[7]

  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 Houk1988_4 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 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. ^ a b c d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference BailerJones2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference belle2012 was invoked but never defined (see the help page).