Xi1 Lupi

For other stars with this Bayer designation, see ξ Lupi.
Xi1 Lupi
The location of Xi1 Lupi (ξ1) in the constellation of Lupus (shown as a red target's bullseye)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 56m 53.49808s[1]
Declination −33° 57′ 58.0129″[1]
Apparent magnitude (V) 5.114[2]
Characteristics
Spectral type A3 V[3]
U−B color index 0.069[2]
B−V color index 0.116[2]
Astrometry
Radial velocity (Rv)−10.0±4.2[4] km/s
Proper motion (μ) RA: +23.27[1] mas/yr
Dec.: −37.85[1] mas/yr
Parallax (π)23.60 ± 3.48 mas[1]
Distanceapprox. 140 ly
(approx. 42 pc)
Details
Mass2.01[5] M☉
Luminosity12[6] L☉
Surface gravity (log g)4.14±0.14[5] cgs
Temperature9,206±313[5] K
Rotational velocity (v sin i)78[5] km/s
Age237[5] Myr
Other designations
ξ1 Lup, CD−33° 10826A, HD 142629, HIP 78105, HR 5925, SAO 207144, WDS J15569-3358A.[7]
Database references
SIMBADdata

Xi1 Lupi (ξ1 Lup, ξ1 Lupi) is a probable binary star[8] in the southern constellation of Lupus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.1,[2] and forms a visual double star with Xi2 Lupi. Based upon an annual parallax shift of 23.60[1] mas as seen from Earth, it is located around 140 light-years from the Sun. It is a member of the Upper Scorpius sub-group of the nearby Sco OB2 association.[9]

This star shows periodic radial velocity variations that can be best explained as a spectroscopic binary system.[8] The visible component is an A-type main-sequence star with a stellar classification of A3 V.[3] It has twice[5] the mass of the Sun and shines with about 12[6] times the Sun's luminosity from its outer atmosphere at an effective temperature of 9,206 K.[5] The star is an estimated 237 million years old and is spinning with a projected rotational velocity of 78 km/s.[5]

  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 Slawson1992 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Levato1975 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference David2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Antolenno2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Brown1997 was invoked but never defined (see the help page).