{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T20:13:08.181Z","years_from_j2000":26.676,"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":"k2-73-c","name":"K2-73 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":877.9575222292614,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":335.025662,"dec_deg":-9.0560881,"epoch_ra_deg":335.380027,"epoch_dec_deg":-8.921315,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-73","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":6.820215705017755e+27,"mass_msun":0.00342998,"constellation":"Aquarius","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/k2-73-c","radius_km":82915.3,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-73","host_v_mag":11.345,"uncertainties":{"mass_kg":[2.6874755405061208e+26,3.165248969929431e+26],"distance_ly":[8.131078496478413,8.281110430228116],"host_mass_solar":[0.04,0.04],"host_radius_solar":[0.039,0.039],"host_temperature_k":[100,100],"orbital_period_days":[100,100]},"host_mass_solar":1.02,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.058,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_temperature_k":5867,"orbital_period_days":1000,"transit_midpoint_bjd":2456905,"equilibrium_temperature_k":186.1},"designations":[{"catalog":"Exoplanet","designation":"K2-73 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."}