{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T12:59:03.722Z","years_from_j2000":26.68,"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":"hip-99770-b","name":"HIP 99770 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":130.7120607156507,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":303.6338344,"dec_deg":36.8066046,"epoch_ra_deg":303.883909,"epoch_dec_deg":36.887808,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 99770","semi_major_axis_km":2363646357.06,"periapsis_km":null,"mass_kg":3.2268118195864255e+28,"mass_msun":0.0162281,"constellation":"Cygnus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hip-99770-b","radius_km":77812.82,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 99770","host_v_mag":4.94292,"eccentricity":0.31,"uncertainties":{"mass_kg":[9.490622998783604e+27,1.1388747598540323e+28],"distance_ly":[0.9155209522508988,0.9285672073595685],"eccentricity":[0.12,0.06],"host_mass_solar":[0.2,0.2],"inclination_deg":[8,10],"host_radius_solar":[0.047376,0.062504],"semi_major_axis_km":[149597870.7,254316380.18999997],"orbital_period_days":[2800,6200],"argument_of_periastron_deg":[50,90]},"host_mass_solar":1.9,"inclination_deg":152,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.93986,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"A5-A6","host_temperature_k":8000,"orbital_period_days":18600,"equilibrium_temperature_k":135.17,"argument_of_periastron_deg":210},"designations":[{"catalog":"Exoplanet","designation":"HIP 99770 b"},{"catalog":"Host star","designation":"HIP 99770"}],"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."}