{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T14:55:32.514Z","years_from_j2000":26.675,"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-9-b","name":"HAT-P-9 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1484.6736160579474,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":110.1685157,"dec_deg":37.1405946,"epoch_ra_deg":110.619273,"epoch_dec_deg":37.090639,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-9","semi_major_axis_km":7909239.423908999,"periapsis_km":null,"mass_kg":1.4217024509516805e+27,"mass_msun":0.000714995,"constellation":"Auriga","discovered":"2008","featured":false,"url":"https://spacecatalog.org/object/hat-p-9-b","radius_km":99588.52719970001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-9","host_v_mag":12.344,"eccentricity":0.084,"uncertainties":{"mass_kg":[1.1958244914546844e+26,1.2148058325888858e+26],"radius_km":[4646.987988500001,4789.9722343],"distance_ly":[28.163603215840794,29.24970395363755],"eccentricity":[0.047,0.052],"host_mass_solar":[0.056,0.057],"inclination_deg":[0.36,0.37],"host_radius_solar":[0.06,0.065],"host_temperature_k":[150,150],"semi_major_axis_km":[116686.33914599998,116686.33914599998],"orbital_period_days":[0.00000102,0.00000102],"argument_of_periastron_deg":[39,42]},"host_mass_solar":1.281,"inclination_deg":86.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.338,"planets_in_system":1,"discovery_facility":"HATNet","host_spectral_type":"F7","host_temperature_k":6350,"orbital_period_days":3.92281072,"periastron_epoch_bjd":2457811.72,"transit_midpoint_bjd":2455484.913088,"equilibrium_temperature_k":1540,"argument_of_periastron_deg":152},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-9 b"},{"catalog":"Host star","designation":"HAT-P-9"}],"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."}