{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T21:02:52.782Z","years_from_j2000":26.687,"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-143361-b","name":"HD 143361 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":223.4647375671159,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":240.4588405,"dec_deg":-44.4350575,"epoch_ra_deg":240.930109,"epoch_dec_deg":-44.510305,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 143361","semi_major_axis_km":297400566.95159996,"periapsis_km":null,"mass_kg":8.256842008941735e+27,"mass_msun":0.00415248,"constellation":"Norma","discovered":"2008","featured":false,"url":"https://spacecatalog.org/object/hd-143361-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 143361","host_v_mag":9.2,"eccentricity":0.197,"uncertainties":{"mass_kg":[1.2527622358394356e+27,2.2777495197080646e+27],"distance_ly":[0.960856688753526,0.9690105981964446],"eccentricity":[0.006,0.006],"host_mass_solar":[0.027,0.027],"inclination_deg":[12,19],"host_radius_solar":[0.041,0.041],"host_temperature_k":[10,10],"semi_major_axis_km":[2692761.6725999997,2692761.6725999997],"orbital_period_days":[1.7,1.64],"argument_of_periastron_deg":[2.051,2.112]},"host_mass_solar":0.968,"inclination_deg":50,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.916,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"G6 V","host_temperature_k":5507,"orbital_period_days":1039.15,"periastron_epoch_bjd":2456805.8,"equilibrium_temperature_k":180.26,"argument_of_periastron_deg":241.889},"designations":[{"catalog":"Exoplanet","designation":"HD 143361 b"},{"catalog":"Host star","designation":"HD 143361"}],"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."}