Iota1 Librae

Iota1 Librae
Map of the constellation of Libra.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Libra
Right ascension 15h 12m 13.29025s[1]
Declination −19° 47′ 30.1592″[1]
Apparent magnitude (V) +4.54[2]
Characteristics
Evolutionary stage Blue subgiant
Spectral type B9IVpSi + B9[3]
U−B color index −0.38[2]
B−V color index −0.08[2]
Variable type Alpha2 Canum Venaticorum
Astrometry
Radial velocity (Rv)−11.6[2] km/s
Proper motion (μ) RA: −35.40[1] mas/yr
Dec.: −32.79[1] mas/yr
Parallax (π)8.59 ± 0.25 mas[1]
Distance380 ± 10 ly
(116 ± 3 pc)
Absolute magnitude (MV)−0.79[4]
Orbit[5]
Period (P)8163.16 d
Eccentricity (e)0.35
Periastron epoch (T)2433155 JD
Argument of periastron (ω)
(secondary)		7.6°
Semi-amplitude (K1)
(primary)		3.4 km/s
Details
Luminosity277[4] L☉
Other designations
ι1 Lib, 24 Librae, BD−19°4047, HD 134759, HIP 74392, HR 5652, SAO 159090, WDS J15122-1948A[2]
Database references
SIMBADdata

Iota1 Librae, Latinized from ι1 Librae, is a quadruple[3] star system in the constellation Libra. Its apparent magnitude is 4.54. It is located 379 light years from earth.[6]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e "iot01 Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-12-16.
  3. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ Extended Hipparcos Compilation (XHIP) (+ Anderson, 2012)