{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T22:32:25.300Z","years_from_j2000":26.673,"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-589-c","name":"Kepler-589 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1998.6960673395351,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":280.6414331,"dec_deg":47.7520581,"epoch_ra_deg":280.823242,"epoch_dec_deg":47.777645,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-589","semi_major_axis_km":6372869.291819999,"periapsis_km":null,"mass_kg":8.6596434082975e+24,"mass_msun":0.00000435506,"constellation":"Draco","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kepler-589-c","radius_km":7126.074966878,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-589","host_v_mag":14.775,"eccentricity":0,"uncertainties":{"distance_ly":[25.087948573971904,25.71743038296522],"host_mass_solar":[0.063,0.108],"host_radius_solar":[0.129,0.194],"host_temperature_k":[160,160]},"host_mass_solar":0.832,"inclination_deg":71.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.916,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5372,"orbital_period_days":3.52466011,"transit_midpoint_bjd":2454964.64011,"equilibrium_temperature_k":1098},"designations":[{"catalog":"Exoplanet","designation":"Kepler-589 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":"2026-09-02T19:50:56.720Z","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."}