{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T02:51:01.473Z","years_from_j2000":26.677,"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":"k2-36-b","name":"K2-36 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":357.95336298034874,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":169.4490102,"dec_deg":3.8665038,"epoch_ra_deg":169.795077,"epoch_dec_deg":3.719837,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-36","semi_major_axis_km":3422799.281616,"periapsis_km":null,"mass_kg":2.568032183150293e+25,"mass_msun":0.000012915,"constellation":"Leo","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-36-b","radius_km":9120.683,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-36","host_v_mag":11.726,"uncertainties":{"mass_kg":[8.361035014907931e+24,8.361035014907931e+24],"radius_km":[510.24800000000005,510.24800000000005],"distance_ly":[1.9862923402949673,2.005861722957972],"host_mass_solar":[0.01,0.01],"inclination_deg":[0.48,0.78],"host_radius_solar":[0.006,0.008],"host_temperature_k":[37,37],"semi_major_axis_km":[14959.78707,14959.78707],"orbital_period_days":[0.000038,0.000038]},"host_mass_solar":0.79,"inclination_deg":84.45,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.718,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"K2 V","host_temperature_k":4916,"orbital_period_days":1.422614,"transit_midpoint_bjd":2456810.8916,"eccentricity_upper_limit":0.093,"equilibrium_temperature_k":1328},"designations":[{"catalog":"Exoplanet","designation":"K2-36 b"}],"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."}