{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T15:52:48.143Z","years_from_j2000":26.686,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-136118-b","name":"HD 136118 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":167.76146828600642,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":229.7306046,"dec_deg":-1.5922913,"epoch_ra_deg":230.078141,"epoch_dec_deg":-1.690414,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 136118","semi_major_axis_km":348114245.11889994,"periapsis_km":null,"mass_kg":2.4869228505988667e+28,"mass_msun":0.0125071,"constellation":"Serpens","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-136118-b","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 136118","host_v_mag":6.9456,"eccentricity":0.344,"uncertainties":{"mass_kg":[2.4011276186623908e+27,2.5605700850538997e+27],"distance_ly":[0.6422019077242678,0.6470942533900189],"eccentricity":[0.014,0.014],"host_mass_solar":[0.159,0.159],"inclination_deg":[5.87,4.025],"host_radius_solar":[0.102728,0.073353],"host_temperature_k":[44,44],"semi_major_axis_km":[16455765.776999999,14959787.07],"orbital_period_days":[2.38111,2.22732],"argument_of_periastron_deg":[2.295,2.007]},"host_mass_solar":1.18,"inclination_deg":116.779,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.67754,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"F7 V","host_temperature_k":6097,"orbital_period_days":1187.59765,"periastron_epoch_bjd":2450608.504,"equilibrium_temperature_k":249.62,"argument_of_periastron_deg":313.267},"designations":[{"catalog":"Exoplanet","designation":"HD 136118 b"},{"catalog":"Host star","designation":"HD 136118"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}