{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T10:47:57.237Z","years_from_j2000":26.683,"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-1649-b","name":"Kepler-1649 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":300.68780464997604,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.5029676,"dec_deg":41.8299933,"epoch_ra_deg":292.72272,"epoch_dec_deg":41.885383,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1649","semi_major_axis_km":7689330.553979999,"periapsis_km":null,"mass_kg":6.151332903825121e+24,"mass_msun":0.00000309359,"constellation":"Cygnus","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/kepler-1649-b","radius_km":6486.5277,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1649","host_v_mag":17.95,"eccentricity":0,"uncertainties":{"radius_km":[325.2831,325.2831],"distance_ly":[1.769398349113333,1.7902723572872048],"host_mass_solar":[0.0051,0.0051],"inclination_deg":[0.079,0.11],"host_radius_solar":[0.0049,0.0049],"host_temperature_k":[61,61],"semi_major_axis_km":[418874.03796,418874.03796],"orbital_period_days":[0.000025,0.000025]},"host_mass_solar":0.1977,"inclination_deg":89.15,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.2317,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":3240,"orbital_period_days":8.689099,"transit_midpoint_bjd":2455374.6219,"equilibrium_temperature_k":307},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1649 b"},{"catalog":"Host star","designation":"Kepler-1649"}],"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."}