{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T08:02:22.482Z","years_from_j2000":26.674,"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-949-c","name":"Kepler-949 c","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":1585.4624598999756,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.6079128,"dec_deg":46.45366,"epoch_ra_deg":298.81272,"epoch_dec_deg":46.523472,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-949","semi_major_axis_km":20853943.17558,"periapsis_km":null,"mass_kg":5.440644927557946e+25,"mass_msun":0.0000273618,"constellation":"Cygnus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/kepler-949-c","radius_km":18942.957000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-949","host_v_mag":14.718,"eccentricity":0,"uncertainties":{"radius_km":[2742.583,3890.641],"distance_ly":[17.570044067600968,17.570044067600968],"host_mass_solar":[0.064,0.104],"host_radius_solar":[0.129,0.186],"host_temperature_k":[163,181],"orbital_period_days":[0.00003334,0.00003334]},"host_mass_solar":0.817,"inclination_deg":89.76,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.895,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5211,"orbital_period_days":20.99757968,"transit_midpoint_bjd":2454965.05689,"equilibrium_temperature_k":582},"designations":[{"catalog":"Exoplanet","designation":"Kepler-949 c"},{"catalog":"Host star","designation":"Kepler-949"}],"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."}