{"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":"2026-09-03T09:04:26.475Z","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-908-b","name":"Kepler-908 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":948.6029936427082,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":295.3225434,"dec_deg":39.3764624,"epoch_ra_deg":295.554862,"epoch_dec_deg":39.4386,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-908","semi_major_axis_km":3778842.2138819997,"periapsis_km":null,"mass_kg":1.182489237822693e+25,"mass_msun":0.00000594691,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-908-b","radius_km":7781.282,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-908","host_v_mag":11.607,"eccentricity":0,"uncertainties":{"radius_km":[510.24800000000005,637.8100000000001],"distance_ly":[6.183924921509455,6.262202452161473],"host_mass_solar":[0.039,0.04],"host_radius_solar":[0.067,0.079],"host_temperature_k":[95.84,89.43],"semi_major_axis_km":[25431.638018999998,25431.638018999998],"orbital_period_days":[0.000001947,0.000001947]},"host_mass_solar":1.11,"inclination_deg":89.94,"stars_in_system":3,"discovery_method":"Transit","host_radius_solar":1.12,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5973,"orbital_period_days":1.340597468,"transit_midpoint_bjd":2454965.24442,"equilibrium_temperature_k":1783},"designations":[{"catalog":"Exoplanet","designation":"Kepler-908 b"},{"catalog":"Host star","designation":"Kepler-908"}],"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."}