{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:11:54.715Z","years_from_j2000":26.679,"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":"iot-dra-b","name":"ι Dra b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":102.17931371151008,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":231.2323227,"dec_deg":58.9661403,"epoch_ra_deg":231.385236,"epoch_dec_deg":58.870869,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"ι Dra","semi_major_axis_km":217365706.1271,"periapsis_km":null,"mass_kg":2.2435832769124436e+28,"mass_msun":0.0112833,"constellation":"Draco","discovered":"2002","featured":false,"url":"https://spacecatalog.org/object/iot-dra-b","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"ι Dra","host_v_mag":3.29668,"eccentricity":0.701,"uncertainties":{"mass_kg":[7.782310859002554e+26,7.972123318978228e+26],"distance_ly":[1.6325627024060507,1.6325627024060507],"eccentricity":[0.0017,0.0016],"host_mass_solar":[0.09,0.09],"inclination_deg":[19,27],"host_radius_solar":[0.24,0.24],"host_temperature_k":[62,62],"semi_major_axis_km":[3889544.6381999995,3889544.6381999995],"orbital_period_days":[0.0128,0.0128],"argument_of_periastron_deg":[0.3,0.3]},"host_mass_solar":1.54,"inclination_deg":46,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":11.79,"planets_in_system":2,"discovery_facility":"Lick Observatory","host_spectral_type":"K2 III","host_temperature_k":4504,"orbital_period_days":510.8544,"periastron_epoch_bjd":2455590.17,"equilibrium_temperature_k":618.67,"argument_of_periastron_deg":89.9},"designations":[{"catalog":"Exoplanet","designation":"iot Dra b"},{"catalog":"Host star","designation":"iot Dra"}],"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."}