{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T15:37:33.769Z","years_from_j2000":26.667,"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-770-d","name":"Kepler-770 d","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3034.744847411879,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":286.4904589,"dec_deg":38.374872,"epoch_ra_deg":286.720419,"epoch_dec_deg":38.415368,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-770","semi_major_axis_km":9215228.83512,"periapsis_km":null,"mass_kg":1.5169306384190103e+25,"mass_msun":0.00000762886,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-770-d","radius_km":8929.34,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-770","host_v_mag":14.852,"eccentricity":0,"uncertainties":{"radius_km":[701.591,1211.8390000000002],"distance_ly":[60.64551687265128,63.12104377952136],"host_mass_solar":[0.057,0.053],"host_radius_solar":[0.066,0.123],"host_temperature_k":[124.54,127.6],"orbital_period_days":[0.00001685,0.00001685]},"host_mass_solar":0.94,"inclination_deg":86.24,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.92,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":5598,"orbital_period_days":4.15244722,"transit_midpoint_bjd":2454967.58277,"equilibrium_temperature_k":1941},"designations":[{"catalog":"Exoplanet","designation":"Kepler-770 d"}],"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":"2026-08-30T09:56:50.739Z","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."}