{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T01:06:53.034Z","years_from_j2000":26.679,"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-1788-b","name":"Kepler-1788 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":1827.9271110946029,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.2243829,"dec_deg":45.7780993,"epoch_ra_deg":291.424433,"epoch_dec_deg":45.830349,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1788","semi_major_axis_km":5131206.965009999,"periapsis_km":null,"mass_kg":3.732604917369612e+25,"mass_msun":0.0000187718,"constellation":"Cygnus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kepler-1788-b","radius_km":15170.340253041,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1788","host_v_mag":15.484,"eccentricity":0,"uncertainties":{"distance_ly":[25.873985444269255,26.6110988579091],"host_mass_solar":[0.053,0.079],"host_radius_solar":[0.066,0.054],"host_temperature_k":[144,130]},"host_mass_solar":0.686,"inclination_deg":86.54,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.704,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4786,"orbital_period_days":2.800120115,"transit_midpoint_bjd":2454965.046786,"equilibrium_temperature_k":956},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1788 b"},{"catalog":"Host star","designation":"Kepler-1788"}],"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."}