23 Librae c
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>23 Librae</td></tr><tr> <td colspan="2">Constellation</td> <td>Libra</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>15h 13m 28s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–25° 18′ 33″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.45</td></tr><tr><td colspan="2">Distance</td><td>83.7 ly
(25.6 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5V</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.05 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>1.2 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>5559 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.23</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>7.32 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>5.8 ± 0.5 AU
(870 ± 75 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>5.1 AU
(770 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>6.5 AU
(149 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.12 ± 0.02</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>5000 ± 400 d
(14 ± 1 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>12 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>195 ± 48°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,461,100 ± 600 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.82 ± 0.03 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>December 14, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Jones et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Keck Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</td></tr>

Other designations
HD 134987 c

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

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, or from 12.5 to 15 years. The reason why the error range for orbital period is so large 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).


  1. 1.0 1.1 1.2 (2010). A long-period planet orbiting a nearby Sun-like star. Monthly Notices of the Royal Astronomical Society 403 (4): 1703–1713.

Coordinates: Sky map 15h 13m 28s, −25° 18′ 33″ Template:23 Librae

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