{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T20:08:53.107Z","years_from_j2000":26.665,"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":"ph2-b","name":"PH2 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1121.5311051081253,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.7636212,"dec_deg":51.962683,"epoch_ra_deg":289.926734,"epoch_dec_deg":52.011237,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"PH2","semi_major_axis_km":124615026.29309998,"periapsis_km":null,"mass_kg":5.200861403452858e+26,"mass_msun":0.000261559,"constellation":"Cygnus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/ph2-b","radius_km":59552.835815852006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"PH2","host_v_mag":12.645,"eccentricity":0.215,"uncertainties":{"mass_kg":[1.2717434818967246e+26,1.2527622357199922e+26],"radius_km":[1715.808015674,1858.7920063500003],"distance_ly":[11.601382355384564,11.842738074894953],"eccentricity":[0.082,0.095],"host_mass_solar":[0.056,0.05],"inclination_deg":[0.017,0.021],"host_radius_solar":[0.027,0.028],"host_temperature_k":[82,84],"semi_major_axis_km":[2393565.9312,2094370.1897999998],"orbital_period_days":[0.00011,0.00011],"argument_of_periastron_deg":[16,33]},"host_mass_solar":0.966,"inclination_deg":89.898,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.949,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G3","host_temperature_k":5734,"orbital_period_days":282.52542,"periastron_epoch_bjd":2455162.8,"transit_midpoint_bjd":2455196.0677,"equilibrium_temperature_k":295.1,"argument_of_periastron_deg":24},"designations":[{"catalog":"Exoplanet","designation":"PH2 b"},{"catalog":"Host star","designation":"PH2"}],"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."}