{"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":"2026-09-02T13:48:12.158Z","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-141-b","name":"Kepler-141 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":982.3275630986193,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.9707271,"dec_deg":47.7316041,"epoch_ra_deg":298.168263,"epoch_dec_deg":47.799905,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-141","semi_major_axis_km":5834316.9573,"periapsis_km":null,"mass_kg":1.5348471420223846e+24,"mass_msun":7.71897e-7,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-141-b","radius_km":4400.889,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-141","host_v_mag":13.624,"eccentricity":0,"uncertainties":{"radius_km":[318.90500000000003,318.90500000000003],"distance_ly":[4.2335097827633295,4.269386984312171],"host_mass_solar":[0.016,0.007],"host_radius_solar":[0.044,0.044],"host_temperature_k":[100,100],"orbital_period_days":[0.000022,0.000022]},"host_mass_solar":0.878,"inclination_deg":84.53,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.787,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":4910,"orbital_period_days":3.107675,"transit_midpoint_bjd":2454965.63058,"equilibrium_temperature_k":968},"designations":[{"catalog":"Exoplanet","designation":"Kepler-141 b"},{"catalog":"Host star","designation":"Kepler-141"}],"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."}