{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:18:42.582Z","years_from_j2000":26.683,"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-1307-b","name":"Kepler-1307 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":3309.247839589622,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.8698348,"dec_deg":46.7418679,"epoch_ra_deg":293.066631,"epoch_dec_deg":46.798118,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1307","semi_major_axis_km":20479948.498829998,"periapsis_km":null,"mass_kg":3.977463799949058e+25,"mass_msun":0.0000200032,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-1307-b","radius_km":15753.907000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1307","host_v_mag":15.636,"eccentricity":0,"uncertainties":{"radius_km":[1722.0870000000002,4209.546],"distance_ly":[95.60132665444324,95.60132665444324],"host_mass_solar":[0.06,0.067],"host_radius_solar":[0.109,0.286],"host_temperature_k":[103.16,77.63],"orbital_period_days":[0.00009522,0.00009522]},"host_mass_solar":1.06,"inclination_deg":89.96,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.08,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5884,"orbital_period_days":18.01621096,"transit_midpoint_bjd":2454978.23823,"equilibrium_temperature_k":768},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1307 b"},{"catalog":"Host star","designation":"Kepler-1307"}],"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."}