{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T14:07:57.237Z","years_from_j2000":26.683,"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-181433-d","name":"HD 181433 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":87.65844038790739,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.2873731,"dec_deg":-66.4677838,"epoch_ra_deg":291.952495,"epoch_dec_deg":-66.414811,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 181433","semi_major_axis_km":1008289648.518,"periapsis_km":null,"mass_kg":5.124936419343146e+27,"mass_msun":0.0025774,"constellation":"Pavo","discovered":"2008","featured":false,"url":"https://spacecatalog.org/object/hd-181433-d","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 181433","host_v_mag":8.4,"eccentricity":0.444,"uncertainties":{"mass_kg":[3.7962491995134415e+27,3.226811819586425e+27],"distance_ly":[0.07338518498626727,0.07338518498626727],"eccentricity":[0.018,0.02],"host_mass_solar":[0.06,0.06],"inclination_deg":[53,6.8],"host_radius_solar":[0.01,0.01],"host_temperature_k":[15,15],"semi_major_axis_km":[26927616.725999996,26927616.725999996],"orbital_period_days":[123.7,102.7],"argument_of_periastron_deg":[1.7,3.4]},"host_mass_solar":0.86,"inclination_deg":164.5,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.79,"planets_in_system":3,"discovery_facility":"La Silla Observatory","host_spectral_type":"K3 IV","host_temperature_k":4918,"orbital_period_days":6896.1,"periastron_epoch_bjd":2450647.2,"equilibrium_temperature_k":81.19,"argument_of_periastron_deg":250.1},"designations":[{"catalog":"Exoplanet","designation":"HD 181433 d"}],"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."}