23 Librae c

{{One source|date=June 2024}}{{short description|Extrasolar planet}} {{Infobox planet | name = 23 Librae c | symbol = | image = | image_size = | image_alt = | caption = | background = | bgcolour = | label_width =  | discoverer = Jones ''et al.''<ref name="Jones2010"/> | discovery_site = [[Keck Observatory]] | discovered = December 14, 2009 | discovery_method = [[Radial velocity method|Radial velocity]] | discovery_ref =  | exosolar planets = | minorplanet = | extrasolarplanet = | mpc_name = | pronounced = | named_after = | alt_names = | mp_category = | adjectives =  | orbit_ref = | orbit_diagram = | epoch = | uncertainty = | observation_arc = | earliest_precovery_date = | apsis = astron | aphelion = {{convert|6.5|AU|km|abbr=on}} | perihelion = {{convert|5.1|AU|km|abbr=on}} | semimajor = {{convert|5.8 ± 0.5|AU|km|abbr=on}} | mean_orbit_radius = | eccentricity = 0.12 ± 0.02 | period = 5000 ± 400 [[day|d]]<br>14 ± 1 [[year|y]] | synodic_period = | avg_speed = | mean_anomaly = | mean_motion = | inclination = | angular_dist = | asc_node = | long_periastron = | time_periastron = 2,461,100 ± 600 | arg_peri = 195 ± 48 | semi-amplitude = | satellite_of = | satellites = | star = [[23 Librae]] | allsatellites = | tisserand =  | physical_ref = | dimensions = | mean_diameter = | mean_radius = | equatorial_radius = | polar_radius = | flattening = | circumference = | surface_area = | volume = | mass = | density = | surface_grav = | moment_of_inertia_factor = | escape_velocity = | rotation = | sidereal_day = | rot_velocity = | axial_tilt = | right_asc_north_pole = | declination = | pole_ecliptic_lat = | pole_ecliptic_lon = | albedo = | single_temperature = | spectral_type = | magnitude = | abs_magnitude = | angular_size = | family =  | atmosphere_ref = | atmosphere = | scale_height = | surface_pressure = | atmosphere_composition =  | note = }} '''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 method|radial velocity]].<ref name="Jones2010"/> 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 [[Astronomical Unit|AU]].

==References== {{Reflist|refs=

<ref name="Jones2010">{{cite journal | title=A long-period planet orbiting a nearby Sun-like star | last1=Jones | first1=Hugh R. A. | last2=Butler | first2=R. Paul | last3=Tinney | first3=C. G. | last4=O'Toole | first4=Simon | last5=Wittenmyer | first5=Rob | last6=Henry | first6=Gregory W. | last7=Meschiari | first7=Stefano | last8=Vogt | first8=Steve | last9=Rivera | first9=Eugenio | last10=Laughlin | first10=Greg | last11=Carter | first11=Brad D. | last12=Bailey | first12=Jeremy | last13=Jenkins | first13=James S. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=403 | issue=4 | pages=1703–1713 | year=2010 | arxiv=0912.2716 | bibcode=2010MNRAS.403.1703J | bibcode-access=free | doi=10.1111/j.1365-2966.2009.16232.x | doi-access=free }}</ref>

}}

{{DEFAULTSORT:23 Librae C}} [[Category:Libra (constellation)]] [[Category:Exoplanets discovered in 2009]] [[Category:Exoplanets detected by radial velocity]] [[Category:Giant planets]]