{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T00:22:38.945Z","years_from_j2000":26.685,"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":"ztf-j1230-2655-b","name":"ZTF J1230-2655 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":608.9013415593882,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":187.5689308,"dec_deg":-26.9309608,"epoch_ra_deg":187.922317,"epoch_dec_deg":-27.079496,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"ZTF J1230-2655","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":4.194855365462353e+28,"mass_msun":0.0210965,"constellation":"Hydra","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/ztf-j1230-2655-b","radius_km":87935.15975090601,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"ZTF J1230-2655","host_v_mag":18.9116,"uncertainties":{"radius_km":[35.745997669000005,35.745997669000005],"distance_ly":[42.51122227160034,49.288751800554266],"host_mass_solar":[0.017,0.017],"inclination_deg":[0.3,0.3],"host_radius_solar":[0.0002,0.0002],"host_temperature_k":[110,110],"orbital_period_days":[9.5e-7,9.5e-7]},"host_mass_solar":0.646,"inclination_deg":86.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.0123,"planets_in_system":1,"discovery_facility":"Zwicky Transient Facility","host_temperature_k":10000,"orbital_period_days":0.23597766,"transit_midpoint_bjd":2460432.5478805,"equilibrium_temperature_k":2949.65},"designations":[{"catalog":"Exoplanet","designation":"ZTF J1230-2655 b"},{"catalog":"Host star","designation":"ZTF J1230-2655"}],"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."}