{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:07:53.490Z","years_from_j2000":26.679,"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":"k2-24-c","name":"K2-24 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":556.2988409612319,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":242.5734559,"dec_deg":-24.9906029,"epoch_ra_deg":242.979225,"epoch_dec_deg":-25.06105,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-24","semi_major_axis_km":39194642.123399995,"periapsis_km":null,"mass_kg":9.794355303177861e+25,"mass_msun":0.0000492572,"constellation":"Scorpius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-24-c","radius_km":50578.333,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-24","host_v_mag":11.275,"eccentricity":0.0282,"uncertainties":{"mass_kg":[1.1944335735582758e+24,7.763818228128793e+24],"radius_km":[829.153,765.3720000000001],"distance_ly":[4.363972333850027,4.435726736947711],"eccentricity":[0.0007,0.0003],"host_mass_solar":[0.056,0.056],"inclination_deg":[0.11,0.15],"host_radius_solar":[0.011,0.011],"host_temperature_k":[65,65],"semi_major_axis_km":[1645576.5776999998,2094370.1897999998],"orbital_period_days":[0.00018,0.00018],"argument_of_periastron_deg":[2.5,0.6]},"host_mass_solar":1.091,"inclination_deg":89.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.185,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"G9 V","host_temperature_k":5726,"orbital_period_days":42.34732,"transit_midpoint_bjd":2456957.98832,"equilibrium_temperature_k":591,"argument_of_periastron_deg":139},"designations":[{"catalog":"Exoplanet","designation":"K2-24 c"},{"catalog":"Host star","designation":"K2-24"}],"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."}