{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T05:43:13.771Z","years_from_j2000":26.666,"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-9446-c","name":"HD 9446 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":164.22071464951344,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":23.3350424,"dec_deg":29.2649187,"epoch_ra_deg":23.711348,"epoch_dec_deg":29.402883,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 9446","semi_major_axis_km":97837007.43779999,"periapsis_km":null,"mass_kg":3.4544571710950964e+27,"mass_msun":0.0017373,"constellation":"Triangulum","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-9446-c","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 9446","host_v_mag":8.35,"eccentricity":0.06,"uncertainties":{"mass_kg":[3.226690632953268e+26,3.226690632953268e+26],"distance_ly":[1.1382857582314345,1.1539412643618383],"eccentricity":[0.06,0.06],"host_mass_solar":[0.1,0.1],"host_temperature_k":[22,22],"semi_major_axis_km":[3291153.1553999996,3291153.1553999996],"orbital_period_days":[0.9,0.9],"argument_of_periastron_deg":[130,130]},"host_mass_solar":1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1,"planets_in_system":2,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G5 V","host_temperature_k":5793,"orbital_period_days":192.9,"periastron_epoch_bjd":2454510,"equilibrium_temperature_k":345.42,"argument_of_periastron_deg":100},"designations":[{"catalog":"Exoplanet","designation":"HD 9446 c"}],"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":"2026-08-30T09:56:50.739Z","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."}