{"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":"2026-09-04T07:51:45.219Z","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-289-b","name":"Kepler-289 b","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":2297.569464060273,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.4653351,"dec_deg":42.8828517,"epoch_ra_deg":297.685219,"epoch_dec_deg":42.95003,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-289","semi_major_axis_km":31689316.950380996,"periapsis_km":null,"mass_kg":2.2097021110828105e+25,"mass_msun":0.0000111129,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-289-b","radius_km":15881.469000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-289","host_v_mag":14.142,"eccentricity":0,"uncertainties":{"mass_kg":[1.1705449020871103e+25,2.263451621892933e+25],"radius_km":[446.46700000000004,446.46700000000004],"distance_ly":[28.731115313067924,28.731115313067924],"host_mass_solar":[0.02,0.02],"inclination_deg":[0.07,0.06],"host_radius_solar":[0.02,0.02],"host_temperature_k":[38,38],"semi_major_axis_km":[230380.72087799996,230380.72087799996],"orbital_period_days":[0.0006,0.0006]},"host_mass_solar":1.08,"inclination_deg":88.98,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":5990,"orbital_period_days":34.5383,"transit_midpoint_bjd":2454965.6879,"equilibrium_temperature_k":607},"designations":[{"catalog":"Exoplanet","designation":"Kepler-289 b"}],"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."}