{"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":"2026-09-07T03:56:41.381Z","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":"koi-1843-03","name":"KOI-1843.03","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":438.0638924751353,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":285.0131082,"dec_deg":40.2209547,"epoch_ra_deg":285.23465,"epoch_dec_deg":40.257761,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-974","semi_major_axis_km":747989.3535,"periapsis_km":null,"mass_kg":4.777734294233103e+25,"mass_msun":0.0000240279,"constellation":"Lyra","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/koi-1843-03","radius_km":3890.641,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"Kepler-974","host_v_mag":15.295,"uncertainties":{"radius_km":[510.24800000000005,765.3720000000001],"distance_ly":[1.4481343170623409,1.4579190083938431],"host_mass_solar":[0.05,0.08],"inclination_deg":[20,12],"host_radius_solar":[0.05,0.08],"host_temperature_k":[65,65],"orbital_period_days":[2e-7,2e-7]},"host_mass_solar":0.46,"inclination_deg":72,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.45,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":3584,"orbital_period_days":0.1768913,"transit_midpoint_bjd":2454964.5523,"equilibrium_temperature_k":1654},"designations":[{"catalog":"Exoplanet","designation":"KOI-1843.03"}],"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."}