{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T03:20:06.822Z","years_from_j2000":26.677,"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-499-b","name":"Kepler-499 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":1815.797355407317,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":295.1099549,"dec_deg":43.9151012,"epoch_ra_deg":295.322759,"epoch_dec_deg":43.976735,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-499","semi_major_axis_km":8945952.66786,"periapsis_km":null,"mass_kg":3.1951098092683876e+25,"mass_msun":0.0000160687,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-499-b","radius_km":13840.477,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-499","host_v_mag":14.63,"eccentricity":0,"uncertainties":{"radius_km":[1020.4960000000001,1594.525],"distance_ly":[22.012293932103013,22.55045195533564],"host_mass_solar":[0.051,0.046],"host_radius_solar":[0.049,0.069],"host_temperature_k":[145.28,140.65],"orbital_period_days":[0.000005753,0.000005753]},"host_mass_solar":0.87,"inclination_deg":88.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.83,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5312,"orbital_period_days":5.632528453,"transit_midpoint_bjd":2454966.817942,"equilibrium_temperature_k":844},"designations":[{"catalog":"Exoplanet","designation":"Kepler-499 b"},{"catalog":"Host star","designation":"Kepler-499"}],"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."}