{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T05:31:24.594Z","years_from_j2000":26.677,"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-70573-b","name":"HD 70573 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":193.0258674603231,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":125.7079153,"dec_deg":1.8591088,"epoch_ra_deg":126.055937,"epoch_dec_deg":1.773322,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 70573","semi_major_axis_km":263292252.43199998,"periapsis_km":null,"mass_kg":1.134711894880362e+28,"mass_msun":0.00570663,"constellation":"Hydra","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/hd-70573-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 70573","host_v_mag":8.667,"eccentricity":0.4,"uncertainties":{"mass_kg":[7.763818228128794e+26,7.763818228128794e+26],"distance_ly":[0.5081516364826862,0.5104347311267035],"eccentricity":[0.1,0.1],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.026131,0.017281],"host_temperature_k":[70,70],"semi_major_axis_km":[7479893.535,7479893.535],"orbital_period_days":[11.6,11.6],"argument_of_periastron_deg":[14.3,14.3]},"host_mass_solar":1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.976919,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G1-1.5 V","host_temperature_k":5737,"orbital_period_days":851.8,"periastron_epoch_bjd":2452106.54,"equilibrium_temperature_k":206.11,"argument_of_periastron_deg":269.6},"designations":[{"catalog":"Exoplanet","designation":"HD 70573 b"},{"catalog":"Host star","designation":"HD 70573"}],"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."}