{"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":"2026-09-03T03:27:03.140Z","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-103-b","name":"Kepler-103 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":1613.9261269833157,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.9845512,"dec_deg":40.0644857,"epoch_ra_deg":289.209054,"epoch_dec_deg":40.111219,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-103","semi_major_axis_km":19896516.8031,"periapsis_km":null,"mass_kg":6.96951990171254e+25,"mass_msun":0.0000350507,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-103-b","radius_km":22232.143170000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-103","host_v_mag":11.883,"eccentricity":0.171,"uncertainties":{"mass_kg":[2.8248354014653227e+25,2.574004351018084e+25],"radius_km":[341.86616000000004,361.63827000000003],"distance_ly":[18.780084228930086,19.223656902624857],"eccentricity":[0.124,0.288],"host_mass_solar":[0.033,0.024],"inclination_deg":[0.072,0.073],"host_radius_solar":[0.022,0.024],"host_temperature_k":[67,50],"semi_major_axis_km":[239356.59312,583431.6957299999],"orbital_period_days":[0.0000092,0.0000091],"argument_of_periastron_deg":[82.4,131.8]},"host_mass_solar":1.212,"inclination_deg":87.914,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.492,"planets_in_system":2,"discovery_facility":"Kepler","host_spectral_type":"G2","host_temperature_k":6047,"orbital_period_days":15.9653287,"transit_midpoint_bjd":2455677.65243,"equilibrium_temperature_k":973,"argument_of_periastron_deg":-46.7},"designations":[{"catalog":"Exoplanet","designation":"Kepler-103 b"},{"catalog":"Host star","designation":"Kepler-103"}],"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."}