{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:03:37.560Z","years_from_j2000":26.681,"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-1654-b","name":"Kepler-1654 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1852.949828393031,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":282.1856949,"dec_deg":44.4344617,"epoch_ra_deg":282.386078,"epoch_dec_deg":44.464046,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1654","semi_major_axis_km":303085286.03819996,"periapsis_km":null,"mass_kg":9.49067056710067e+26,"mass_msun":0.0004773,"constellation":"Lyra","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/kepler-1654-b","radius_km":58552.0486551,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1654","host_v_mag":13.497,"eccentricity":0.26,"uncertainties":{"radius_km":[1215.3660893,1358.3503351],"distance_ly":[12.485266138996938,12.64834432785531],"eccentricity":[0.11,0.21],"host_mass_solar":[0.052,0.056],"inclination_deg":[0.017,0.012],"host_radius_solar":[0.023,0.026],"host_temperature_k":[93,95],"semi_major_axis_km":[5235925.4745000005,5535121.215899999],"orbital_period_days":[0.0019,0.0018],"argument_of_periastron_deg":[71,73]},"host_mass_solar":1.011,"inclination_deg":89.982,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.179,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G5 V","host_temperature_k":5597,"orbital_period_days":1047.8356,"transit_midpoint_bjd":2455375.1341,"equilibrium_temperature_k":206,"argument_of_periastron_deg":81},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1654 b"},{"catalog":"Host star","designation":"Kepler-1654"}],"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."}