{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T21:05:23.781Z","years_from_j2000":26.673,"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-78-b","name":"Kepler-78 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":405.6602563489768,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":293.7419543,"dec_deg":44.4482521,"epoch_ra_deg":293.950847,"epoch_dec_deg":44.506595,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-78","semi_major_axis_km":1347876.815007,"periapsis_km":null,"mass_kg":1.0033242017889517e+25,"mass_msun":0.00000504586,"constellation":"Cygnus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-78-b","radius_km":7660.098100000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-78","host_v_mag":11.717,"eccentricity":0,"uncertainties":{"mass_kg":[1.6124853243036724e+24,1.6124853243036724e+24],"radius_km":[178.5868,178.5868],"distance_ly":[1.073054482688086,1.0763160464652533],"host_mass_solar":[0.046,0.032],"inclination_deg":[2.1,2.6],"host_radius_solar":[0.0078,0.0077],"host_temperature_k":[50,50],"semi_major_axis_km":[28423.595433,17951.744484],"orbital_period_days":[8e-8,8e-8]},"host_mass_solar":0.779,"inclination_deg":75.2,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.7475,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G","host_temperature_k":5058,"orbital_period_days":0.35500745,"periastron_epoch_bjd":2456464.1575,"transit_midpoint_bjd":2454953.95984,"equilibrium_temperature_k":2223,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"Kepler-78 b"},{"catalog":"Host star","designation":"Kepler-78"}],"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."}