{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T03:22:33.144Z","years_from_j2000":26.671,"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":"k2-19-b","name":"K2-19 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":945.2892448451059,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":174.9602543,"dec_deg":0.603596,"epoch_ra_deg":175.304427,"epoch_dec_deg":0.454847,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-19","semi_major_axis_km":11200392.579309,"periapsis_km":null,"mass_kg":1.8394277032797447e+26,"mass_msun":0.0000925075,"constellation":"Virgo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-19-b","radius_km":44646.700000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-19","host_v_mag":13.024,"eccentricity":0.1,"uncertainties":{"mass_kg":[5.374951081012241e+24,1.4930419669478448e+25],"radius_km":[1275.6200000000001,1275.6200000000001],"distance_ly":[17.837492297328698,18.525682254311025],"eccentricity":[0.06,0.08],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.03,0.03],"host_temperature_k":[100,100],"semi_major_axis_km":[139126.01975099999,139126.01975099999],"orbital_period_days":[0.0002,0.0003],"argument_of_periastron_deg":[12,12]},"host_mass_solar":0.88,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.82,"planets_in_system":3,"discovery_facility":"K2","host_spectral_type":"G9","host_temperature_k":5322,"orbital_period_days":7.9193,"periastron_epoch_bjd":2456809.5,"transit_midpoint_bjd":2456813.4,"equilibrium_temperature_k":857,"argument_of_periastron_deg":271},"designations":[{"catalog":"Exoplanet","designation":"K2-19 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."}