23 Librae c

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23 Librae c
Exoplanet List of exoplanets
Parent star
Star 23 Librae
Constellation Libra
Right ascension (α) 15h 13m 28s
Declination (δ) –25° 18′ 33″
Apparent magnitude (mV) 6.45
Distance 83.7 ly
(25.6 pc)
Spectral type G5V
Mass (m) 1.05 M
Radius (r) 1.2 R
Temperature (T) 5559 K
Metallicity [Fe/H] 0.23
Age 7.32 Gyr
Orbital elements
Semi-major axis (a) 5.8 ± 0.5 AU
(870 ± 75 Gm)
Periastron (q) 5.1 AU
(770 Gm)
Apastron (Q) 6.5 AU
(149 Gm)
Eccentricity (e) 0.12 ± 0.02
Orbital period (P) 5000 ± 400 d
(14 ± 1 y)
Orbital speed (υ) 12 km/s
Argument of
periastron
(ω) 195 ± 48°
Time of periastron (T0) 2,461,100 ± 600 JD
Physical characteristics
Minimum mass (m sin i) 0.82 ± 0.03 MJ
Discovery information
Discovery date December 14, 2009
Discoverer(s) Jones et al.[1]
Discovery method Radial velocity
Discovery site Keck Observatory
Discovery status Published[1]
Other designations
HD 134987 c
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD data
Exoplanet Archive data
Open Exoplanet Catalogue data

23 Librae c (23 Lib c) is an extrasolar planet like Jupiter discovered in 2009 orbiting the star 23 Librae. It has one of the longest known orbits of a planet detected via radial velocity.[1] The actual orbital period of this planet range from 4600 to 5400 days (from 12.5 to 15 years). The reason the error range for orbital period is so large is because this planet did not complete the orbit during the time of continuous observations. Using the range of orbital periods, this planet's average distance would sit between 5.3 and 6.3 AU, or between 491 and 584 Mmi (millions of miles).

References[edit]

  1. ^ a b c Jones, Hugh R. A.; et al. (2010). "A long-period planet orbiting a nearby Sun-like star". Monthly Notices of the Royal Astronomical Society. 403 (4): 1703–1713. arXiv:0912.2716Freely accessible. Bibcode:2010MNRAS.403.1703J. doi:10.1111/j.1365-2966.2009.16232.x. 

Coordinates: Sky map 15h 13m 28s, −25° 18′ 33″