{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T04:20:01.032Z","years_from_j2000":26.671,"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-139-c","name":"Kepler-139 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":1275.395376295999,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":282.3919451,"dec_deg":43.8894167,"epoch_ra_deg":282.595035,"epoch_dec_deg":43.91951,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-139","semi_major_axis_km":87664352.2302,"periapsis_km":null,"mass_kg":7.763818228128793e+25,"mass_msun":0.0000390454,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-139-c","radius_km":21557.978,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-139","host_v_mag":12.775,"eccentricity":0,"uncertainties":{"mass_kg":[4.180517507453966e+25,4.777734294233103e+25],"radius_km":[4400.889,4400.889],"distance_ly":[13.532228111467685,13.822507287635588],"host_mass_solar":[0.0255,0.0255],"host_radius_solar":[0.251,0.251],"host_temperature_k":[100,100],"orbital_period_days":[0.00172,0.00172]},"host_mass_solar":1.078,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.3,"planets_in_system":5,"discovery_facility":"Kepler","host_temperature_k":5594,"orbital_period_days":157.072878,"transit_midpoint_bjd":2455314.26266,"equilibrium_temperature_k":350},"designations":[{"catalog":"Exoplanet","designation":"Kepler-139 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."}