{"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":"2026-09-03T10:20:10.514Z","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-88-d","name":"Kepler-88 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1229.1627097546507,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.1481028,"dec_deg":40.669413,"epoch_ra_deg":291.371622,"epoch_dec_deg":40.721477,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-142","semi_major_axis_km":368957696.3974163,"periapsis_km":null,"mass_kg":5.764019880550989e+27,"mass_msun":0.00289881,"constellation":"Lyra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/kepler-88-d","radius_km":83553.11,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-142","host_v_mag":13.209,"eccentricity":0.41,"uncertainties":{"mass_kg":[2.628154142199028e+26,2.628154142199028e+26],"distance_ly":[6.493773480340362,6.555743192106542],"eccentricity":[0.03,0.03],"host_mass_solar":[0.023,0.023],"host_radius_solar":[0.016,0.016],"host_temperature_k":[60,60],"orbital_period_days":[14,14]},"host_mass_solar":0.99,"inclination_deg":89,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.897,"planets_in_system":3,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G6 V","host_temperature_k":5466,"orbital_period_days":1403,"periastron_epoch_bjd":2456235,"equilibrium_temperature_k":158.95},"designations":[{"catalog":"Exoplanet","designation":"Kepler-88 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":"2026-09-02T19:50:56.720Z","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."}