{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T12:52:34.772Z","years_from_j2000":26.686,"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":"hd-217107-b","name":"HD 217107 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":65.43316634115536,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":344.5647243,"dec_deg":-2.3954489,"epoch_ra_deg":344.910709,"epoch_dec_deg":-2.251737,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 217107","semi_major_axis_km":11008907.304813,"periapsis_km":null,"mass_kg":2.7446881712362737e+27,"mass_msun":0.00138034,"constellation":"Pisces","discovered":"1998","featured":false,"url":"https://spacecatalog.org/object/hd-217107-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 217107","host_v_mag":6.155,"eccentricity":0.1284,"uncertainties":{"mass_kg":[1.2717434818967246e+26,3.4166242795620975e+26],"distance_ly":[0.07599443600800122,0.07566827963028447],"eccentricity":[0.0014,0.0015],"host_mass_solar":[0.023,0.018],"inclination_deg":[26,25],"host_radius_solar":[0.0173,0.0173],"host_temperature_k":[17,17],"semi_major_axis_km":[79286.87147099999,62831.105694],"orbital_period_days":[0.0000047,0.0000047],"argument_of_periastron_deg":[0.7,0.71]},"host_mass_solar":1.045,"inclination_deg":93,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.2245,"planets_in_system":2,"discovery_facility":"Lick Observatory","host_spectral_type":"G","host_temperature_k":5622,"orbital_period_days":7.1270166,"periastron_epoch_bjd":2455201.109,"transit_midpoint_bjd":2456306.847,"equilibrium_temperature_k":1105.84,"argument_of_periastron_deg":22.78},"designations":[{"catalog":"Exoplanet","designation":"HD 217107 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."}