{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T19:01:48.626Z","years_from_j2000":26.681,"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-6718-b","name":"HD 6718 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":167.4630352003956,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":16.9536005,"dec_deg":-8.2336165,"epoch_ra_deg":17.291821,"epoch_dec_deg":-8.090006,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 6718","semi_major_axis_km":528080483.5709999,"periapsis_km":null,"mass_kg":4.555499039416129e+27,"mass_msun":0.00229103,"constellation":"Cetus","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-6718-b","radius_km":84828.73000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 6718","host_v_mag":8.45,"eccentricity":0.06,"uncertainties":{"mass_kg":[3.7962491995134415e+26,5.6943737992701615e+26],"distance_ly":[0.45172658313768965,0.4543358341594236],"eccentricity":[0.03,0.03],"inclination_deg":[11.5,16.4],"host_radius_solar":[0.03,0.03],"host_temperature_k":[19,19],"semi_major_axis_km":[7479893.535,7479893.535],"orbital_period_days":[19,19],"argument_of_periastron_deg":[27,34]},"host_mass_solar":0.96,"inclination_deg":51.4,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.02,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G5 V","host_temperature_k":5746,"orbital_period_days":2476,"periastron_epoch_bjd":2458193,"equilibrium_temperature_k":148.94,"argument_of_periastron_deg":129},"designations":[{"catalog":"Exoplanet","designation":"HD 6718 b"},{"catalog":"Host star","designation":"HD 6718"}],"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."}