{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.689","julian_year":2026.689,"time":"2026-09-09T19:12:00.737Z","years_from_j2000":26.689,"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-94771-b","name":"HD 94771 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":188.45543813937837,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":163.9746776,"dec_deg":-35.1145225,"epoch_ra_deg":164.288582,"epoch_dec_deg":-35.257795,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 94771","semi_major_axis_km":520600590.03599995,"periapsis_km":null,"mass_kg":1.0092963696567432e+27,"mass_msun":0.00050759,"constellation":"Hydra","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hd-94771-b","radius_km":90569.02,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 94771","host_v_mag":7.37,"eccentricity":0.39,"uncertainties":{"mass_kg":[5.374951081012241e+25,5.374951081012241e+25],"distance_ly":[0.3910614968823754,0.3930184351486758],"eccentricity":[0.04,0.05],"host_mass_solar":[0.024,0.024],"host_radius_solar":[0.019,0.019],"host_temperature_k":[21,21],"semi_major_axis_km":[4487936.120999999,4487936.120999999],"orbital_period_days":[20,21],"argument_of_periastron_deg":[8,8]},"host_mass_solar":1.2,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.903,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G3/G5 V","host_temperature_k":5631,"orbital_period_days":2164,"periastron_epoch_bjd":2455485,"equilibrium_temperature_k":200.79,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"HD 94771 b"},{"catalog":"Host star","designation":"HD 94771"}],"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":"2026-09-09T11:17:28.634Z","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."}