Delta Leporis

Delta Leporis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 05h 51m 19.29613s[1]
Declination −20° 52′ 44.7232″[1]
Apparent magnitude (V) 3.85[2]
Characteristics
Spectral type K1 IV Fe−0.5[3] or K0 IIIb Fe−1.5 CH0.5[4]
U−B color index +0.71[2]
B−V color index +0.98[2]
Astrometry
Radial velocity (Rv)+100.20[5] km/s
Proper motion (μ) RA: +229.49[1] mas/yr
Dec.: −648.41[1] mas/yr
Parallax (π)28.68 ± 0.17 mas[1]
Distance113.7 ± 0.7 ly
(34.9 ± 0.2 pc)
Absolute magnitude (MV)+1.04[6]
Details
Mass0.94[6] M☉
Radius10[7] R☉
Luminosity45.7[6] L☉
Surface gravity (log g)2.46±0.23[8] cgs
Temperature4,660±84[8] K
Metallicity [Fe/H]−0.74±0.09[8] dex
Rotational velocity (v sin i)0[9] km/s
Age10.7[6] Gyr
Other designations
 Lep, 15 Lep, BD−20° 1211, FK5 222, GC 7362, HD 39364, HIP 27654, HR 2035, SAO 170926, LHS 1792[10]
Database references
SIMBADdata

Delta Leporis (δ Leporis) is a solitary,[11] orange-hued star in the southern constellation of Lepus. It is visible to the naked eye with an apparent visual magnitude of 3.85.[2] Based upon an annual parallax shift of 28.68 mas,[1] it is 114 light years distant from Earth.

This is an old, evolved K-type star with an age of about 10.7 billion years.[6] Keenan and McNeil (1989) classified it as K0 IIIb Fe−1.5 CH0.5,[4] indicating it is a giant star showing a deficiency of iron and an excess of cyanogen in its atmosphere. However, Gray et al. (2006) listed it as K1 IV Fe−0.5,[3] which would suggest a less evolved subgiant star. It may be a red clump star, which indicates it is generating energy through helium fusion at its core.[12]

The measured angular diameter of this star, after correction for limb darkening, is 2.63±0.04 mas.[13] At the estimated distance of this star, this yields a physical size of about 10 times the radius of the Sun.[7] It has only 94%[6] of the Sun's mass and is radiating 46[6] times the Sun's luminosity from its photosphere at an effective temperature of 4,660 K.[8]

  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 Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Perkins1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference sharma2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference uesugi_fukuda70 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).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).