{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:25:53.086Z","years_from_j2000":26.67,"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-440-b","name":"Kepler-440 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":981.8285438407127,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":285.3500664,"dec_deg":41.4523695,"epoch_ra_deg":285.566213,"epoch_dec_deg":41.489992,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-440","semi_major_axis_km":36202684.7094,"periapsis_km":null,"mass_kg":2.4605331615300482e+25,"mass_msun":0.0000123744,"constellation":"Lyra","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kepler-440-b","radius_km":11863.266000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-440","host_v_mag":15.637,"uncertainties":{"radius_km":[1211.8390000000002,1530.7440000000001],"distance_ly":[7.429842284387415,7.429842284387415],"host_mass_solar":[0.047,0.043],"inclination_deg":[0.18,0.07],"host_radius_solar":[0.054,0.029],"host_temperature_k":[154,154],"semi_major_axis_km":[6133512.6987,9873459.4662],"orbital_period_days":[0.00068,0.00087]},"host_mass_solar":0.575,"inclination_deg":89.93,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.559,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4134,"orbital_period_days":101.11141,"transit_midpoint_bjd":2455756.2986,"eccentricity_lower_limit":0.34,"equilibrium_temperature_k":229},"designations":[{"catalog":"Exoplanet","designation":"Kepler-440 b"},{"catalog":"Host star","designation":"Kepler-440"}],"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."}