{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:09:01.897Z","years_from_j2000":26.666,"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-100-e","name":"Kepler-100 e","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":993.6190968951729,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.3861294,"dec_deg":41.9901394,"epoch_ra_deg":291.604059,"epoch_dec_deg":42.042749,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-100","semi_major_axis_km":46733116.090195924,"periapsis_km":null,"mass_kg":1.4418436629323388e+26,"mass_msun":0.0000725124,"constellation":"Lyra","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/kepler-100-e","radius_km":33612.587,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-100","host_v_mag":11.055,"eccentricity":0.026437,"uncertainties":{"mass_kg":[1.9900133420617535e+25,1.9900133420617535e+25],"distance_ly":[5.6881672273800055,5.750136939146186],"eccentricity":[0.127095,0.127095],"host_mass_solar":[0.0335,0.0335],"host_radius_solar":[0.026,0.035],"host_temperature_k":[53.65,59.98],"orbital_period_days":[0.044471,0.044471]},"host_mass_solar":1.097,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.5,"planets_in_system":4,"discovery_facility":"W. M. Keck Observatory","host_temperature_k":5884,"orbital_period_days":60.888588,"equilibrium_temperature_k":621.73},"designations":[{"catalog":"Exoplanet","designation":"Kepler-100 e"},{"catalog":"Host star","designation":"Kepler-100"}],"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":"2026-08-30T09:56:50.739Z","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."}