{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T14:55:37.584Z","years_from_j2000":26.678,"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":"gpx-1-b","name":"GPX-1 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2136.3666743737726,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":38.3691648,"dec_deg":56.025708,"epoch_ra_deg":38.849448,"epoch_dec_deg":56.143988,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GPX-1","semi_major_axis_km":5056408.02966,"periapsis_km":null,"mass_kg":3.73930546152074e+28,"mass_msun":0.0188055,"constellation":"Perseus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/gpx-1-b","radius_km":105093.23971630301,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GPX-1","host_v_mag":12.316,"eccentricity":0,"uncertainties":{"mass_kg":[3.036999359610753e+27,3.036999359610753e+27],"radius_km":[7149.199980267,7149.199980267],"distance_ly":[53.062381090736984,55.77926371711746],"host_mass_solar":[0.1,0.1],"inclination_deg":[0.6,0.7],"host_radius_solar":[0.1,0.1],"host_temperature_k":[200,200],"semi_major_axis_km":[44879.361209999995,44879.361209999995],"orbital_period_days":[0.000008,0.000008]},"host_mass_solar":1.68,"inclination_deg":79.9,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.56,"planets_in_system":1,"discovery_facility":"Acton Sky Portal Observatory","host_spectral_type":"F2","host_temperature_k":7000,"orbital_period_days":1.744579,"transit_midpoint_bjd":2458770.23823,"equilibrium_temperature_k":2300},"designations":[{"catalog":"Exoplanet","designation":"GPX-1 b"},{"catalog":"Host star","designation":"GPX-1"}],"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."}