{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T08:29:30.972Z","years_from_j2000":26.672,"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-305-b","name":"Kepler-305 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":2832.5931245030415,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":299.2242557,"dec_deg":40.343167,"epoch_ra_deg":299.456521,"epoch_dec_deg":40.414413,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-305","semi_major_axis_km":8595893.650422,"periapsis_km":null,"mass_kg":6.270776261180948e+25,"mass_msun":0.0000315366,"constellation":"Cygnus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-305-b","radius_km":22961.160000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-305","host_v_mag":15.851,"eccentricity":0.005,"uncertainties":{"mass_kg":[1.1944335735582758e+25,1.5527636456257586e+25],"radius_km":[2296.116,5740.290000000001],"distance_ly":[81.95005146510896,86.88805902374045],"eccentricity":[0.0034,0.0035],"host_mass_solar":[0.06,0.13],"host_radius_solar":[0.08,0.2],"host_temperature_k":[60,60],"semi_major_axis_km":[77790.89276399999,77790.89276399999]},"host_mass_solar":0.76,"inclination_deg":84.98,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.8,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":5080,"orbital_period_days":5.487,"transit_midpoint_bjd":2455189.0773,"equilibrium_temperature_k":836},"designations":[{"catalog":"Exoplanet","designation":"Kepler-305 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."}