{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T12:09:21.500Z","years_from_j2000":26.68,"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":"hat-p-11-b","name":"HAT-P-11 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":123.171977575595,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.7101763,"dec_deg":48.0818635,"epoch_ra_deg":297.905673,"epoch_dec_deg":48.149606,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-11","semi_major_axis_km":7865856.041406,"periapsis_km":null,"mass_kg":1.4930419669478448e+26,"mass_msun":0.0000750872,"constellation":"Cygnus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hat-p-11-b","radius_km":27808.516000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-11","host_v_mag":9.46,"eccentricity":0.251,"uncertainties":{"mass_kg":[8.958251801687069e+24,8.958251801687069e+24],"radius_km":[382.68600000000004,382.68600000000004],"distance_ly":[0.10958854291282578,0.10991469929054254],"eccentricity":[0.047,0.045],"host_mass_solar":[0.03,0.03],"inclination_deg":[0.068,0.068],"host_radius_solar":[0.009,0.009],"host_temperature_k":[35,33],"semi_major_axis_km":[89758.72241999999,89758.72241999999],"orbital_period_days":[0.0001,0.0001],"argument_of_periastron_deg":[11,11]},"host_mass_solar":0.811,"inclination_deg":89.027,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.683,"planets_in_system":2,"discovery_facility":"HATNet","host_spectral_type":"K4","host_temperature_k":4653,"orbital_period_days":4.888,"periastron_epoch_bjd":2454957.15,"transit_midpoint_bjd":2454957.8132067,"equilibrium_temperature_k":838,"argument_of_periastron_deg":28},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-11 b"}],"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."}