{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T23:50:38.686Z","years_from_j2000":26.684,"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-5388-b","name":"HD 5388 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":173.07846955554479,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":13.79903,"dec_deg":-47.4067326,"epoch_ra_deg":14.106601,"epoch_dec_deg":-47.261002,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 5388","semi_major_axis_km":262843458.81989998,"periapsis_km":null,"mass_kg":6.073998719221506e+27,"mass_msun":0.0030547,"constellation":"Phoenix","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hd-5388-b","radius_km":83553.11,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 5388","host_v_mag":6.73,"eccentricity":0.41,"uncertainties":{"mass_kg":[3.7962491995134415e+26,5.6943737992701615e+26],"distance_ly":[0.24722653430929153,0.24820500344244176],"eccentricity":[0.02,0.02],"inclination_deg":[6.8,10.2],"host_temperature_k":[32,32],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[1,1],"argument_of_periastron_deg":[2.7,2.8]},"host_mass_solar":1.21,"inclination_deg":38.7,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.91,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"F6 V","host_temperature_k":6297,"orbital_period_days":772.5,"periastron_epoch_bjd":2458432,"equilibrium_temperature_k":316.59,"argument_of_periastron_deg":325.9},"designations":[{"catalog":"Exoplanet","designation":"HD 5388 b"},{"catalog":"Host star","designation":"HD 5388"}],"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."}