{"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":"2026-09-02T15:01:14.684Z","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-145-c","name":"Kepler-145 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":1848.81742708736,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.3877397,"dec_deg":44.5290465,"epoch_ra_deg":291.593983,"epoch_dec_deg":44.581663,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-145","semi_major_axis_km":39260465.186508,"periapsis_km":null,"mass_kg":4.741901287026356e+26,"mass_msun":0.000238477,"constellation":"Cygnus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-145-c","radius_km":27553.392000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-145","host_v_mag":11.977,"eccentricity":0.11,"uncertainties":{"mass_kg":[9.794355303177861e+25,9.794355303177861e+25],"radius_km":[765.3720000000001,765.3720000000001],"distance_ly":[26.575221656360252,27.348212271548935],"eccentricity":[0.11,0.11],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.05,0.05],"host_temperature_k":[54,54],"semi_major_axis_km":[620831.163405,620831.163405]},"host_mass_solar":1.32,"inclination_deg":89.29,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.85,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":6022,"orbital_period_days":42.882,"transit_midpoint_bjd":2455036.6478,"equilibrium_temperature_k":709},"designations":[{"catalog":"Exoplanet","designation":"Kepler-145 c"}],"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":"2026-09-01T22:58:55.274Z","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."}