{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:48:46.649Z","years_from_j2000":26.687,"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-33564-b","name":"HD 33564 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":68.33987197936696,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":80.6378979,"dec_deg":79.2318488,"epoch_ra_deg":81.758618,"epoch_dec_deg":79.257031,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 33564","semi_major_axis_km":164557657.77,"periapsis_km":null,"mass_kg":1.7272106690439448e+28,"mass_msun":0.00868639,"constellation":"Camelopardalis","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-33564-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 33564","host_v_mag":5.10111,"eccentricity":0.34,"uncertainties":{"distance_ly":[0.24135571951039012,0.2433126577766906],"eccentricity":[0.02,0.02],"host_mass_solar":[0.04,0.03],"host_radius_solar":[0.0238,0.0238],"orbital_period_days":[3,3],"argument_of_periastron_deg":[4,4]},"host_mass_solar":1.25,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.4367,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"F6 V","host_temperature_k":6250,"orbital_period_days":388,"periastron_epoch_bjd":2452603,"equilibrium_temperature_k":344.43,"argument_of_periastron_deg":205},"designations":[{"catalog":"Exoplanet","designation":"HD 33564 b"},{"catalog":"Host star","designation":"HD 33564"}],"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."}