{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T04:16:54.257Z","years_from_j2000":26.666,"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-49-d","name":"Kepler-49 d","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1015.0704018576031,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.2945208,"dec_deg":40.5918123,"epoch_ra_deg":292.51923,"epoch_dec_deg":40.64664,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-49","semi_major_axis_km":4637533.991699999,"periapsis_km":null,"mass_kg":1.4093241177771453e+27,"mass_msun":0.000708769,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-49-d","radius_km":10204.960000000001,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"Kepler-49","host_v_mag":15.655,"eccentricity":0,"uncertainties":{"radius_km":[446.46700000000004,446.46700000000004],"distance_ly":[8.121293805146912,8.251756356233608],"host_mass_solar":[0.009,0.009],"host_radius_solar":[0.021,0.021],"host_temperature_k":[100,100],"orbital_period_days":[0.000003,0.000003]},"host_mass_solar":0.549,"inclination_deg":89.14,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.559,"planets_in_system":4,"discovery_facility":"Kepler","host_spectral_type":"M1 V","host_temperature_k":4252,"orbital_period_days":2.576549,"transit_midpoint_bjd":2455005.12932,"equilibrium_temperature_k":717},"designations":[{"catalog":"Exoplanet","designation":"Kepler-49 d"},{"catalog":"Host star","designation":"Kepler-49"}],"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":"2026-08-30T09:56:50.739Z","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."}