{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:23:00.801Z","years_from_j2000":26.682,"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":"kepler-1937-b","name":"Kepler-1937 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2951.940266237152,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.6583922,"dec_deg":40.7785383,"epoch_ra_deg":290.881195,"epoch_dec_deg":40.82943,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1937","semi_major_axis_km":13688205.169049999,"periapsis_km":null,"mass_kg":5.607865627856106e+25,"mass_msun":0.0000282028,"constellation":"Lyra","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kepler-1937-b","radius_km":19280.443318730002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1937","host_v_mag":14.163,"eccentricity":0,"uncertainties":{"distance_ly":[50.74340924517094,52.514438376172855],"host_mass_solar":[0.163,0.181],"host_radius_solar":[0.143,0.428],"host_temperature_k":[246,179],"semi_major_axis_km":[146605.913286,146605.913286]},"host_mass_solar":1.19,"inclination_deg":89.82,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.196,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6457,"orbital_period_days":9.688599586,"transit_midpoint_bjd":2454964.8335,"equilibrium_temperature_k":1014},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1937 b"},{"catalog":"Host star","designation":"Kepler-1937"}],"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."}