{"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":"2026-09-08T21:02:45.755Z","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":"l-98-59-c","name":"L 98-59 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":34.635850375251856,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":124.5328604,"dec_deg":-68.3144658,"epoch_ra_deg":124.563334,"epoch_dec_deg":-68.397395,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"L 98-59","semi_major_axis_km":4622574.20463,"periapsis_km":null,"mass_kg":1.1944335735582758e+25,"mass_msun":0.00000600698,"constellation":"Volans","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/l-98-59-c","radius_km":8476.4949,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"L 98-59","host_v_mag":11.685,"eccentricity":0.002,"uncertainties":{"mass_kg":[7.763818228128793e+23,7.763818228128793e+23],"radius_km":[184.96490000000003,184.96490000000003],"distance_ly":[0.01043700408693579,0.01043700408693579],"eccentricity":[0.001,0.002],"host_mass_solar":[0.0067,0.0067],"inclination_deg":[0.17,0.21],"host_radius_solar":[0.0062,0.0062],"host_temperature_k":[60,60],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[4e-7,4e-7],"argument_of_periastron_deg":[10,20]},"host_mass_solar":0.2923,"inclination_deg":88.88,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.3155,"planets_in_system":5,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M3 V","host_temperature_k":3415,"orbital_period_days":3.6906764,"transit_midpoint_bjd":2458367.27303,"equilibrium_temperature_k":526,"argument_of_periastron_deg":261},"designations":[{"catalog":"Exoplanet","designation":"L 98-59 c"}],"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."}