{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T15:10:51.777Z","years_from_j2000":26.681,"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-9174-b","name":"HD 9174 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":265.7825491067302,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":22.5043352,"dec_deg":-19.6052945,"epoch_ra_deg":22.828849,"epoch_dec_deg":-19.466401,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 9174","semi_major_axis_km":329115315.54,"periapsis_km":null,"mass_kg":2.1069288658963486e+27,"mass_msun":0.0010596,"constellation":"Cetus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-9174-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 9174","host_v_mag":8.4,"eccentricity":0.12,"uncertainties":{"mass_kg":[2.657387758788188e+26,2.657387758788188e+26],"distance_ly":[0.9921677010143336,0.9990169849463851],"eccentricity":[0.05,0.05],"host_mass_solar":[0.05,0.05],"host_radius_solar":[0.07,0.07],"host_temperature_k":[100,100],"semi_major_axis_km":[13463808.362999998,13463808.362999998],"orbital_period_days":[34,34],"argument_of_periastron_deg":[37.82,37.82]},"host_mass_solar":1.03,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.67,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"G8 IV","host_temperature_k":5577,"orbital_period_days":1179,"equilibrium_temperature_k":234.3,"argument_of_periastron_deg":101.99},"designations":[{"catalog":"Exoplanet","designation":"HD 9174 b"},{"catalog":"Host star","designation":"HD 9174"}],"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."}