{"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":"2026-09-08T07:32:45.225Z","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":"hd-43691-b","name":"HD 43691 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":279.1927947329318,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":94.8946124,"dec_deg":41.0920773,"epoch_ra_deg":95.368995,"epoch_dec_deg":41.080998,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 43691","semi_major_axis_km":35604293.2266,"periapsis_km":null,"mass_kg":4.8402419892213416e+27,"mass_msun":0.00243423,"constellation":"Auriga","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/hd-43691-b","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 43691","host_v_mag":8.03,"eccentricity":0.0796,"uncertainties":{"mass_kg":[6.453655985628456e+26,6.453655985628456e+26],"distance_ly":[1.191123091421547,1.2015600955084829],"eccentricity":[0.0067,0.0067],"host_mass_solar":[0.25,0.25],"host_radius_solar":[0.11,0.11],"semi_major_axis_km":[2243968.0604999997,2243968.0604999997],"orbital_period_days":[0.0011,0.0011],"argument_of_periastron_deg":[4.8,4.8]},"host_mass_solar":1.32,"stars_in_system":3,"discovery_method":"Radial Velocity","host_radius_solar":1.6,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G0","host_temperature_k":6093,"orbital_period_days":36.9987,"periastron_epoch_bjd":2463048.04,"equilibrium_temperature_k":761.79,"argument_of_periastron_deg":292.7},"designations":[{"catalog":"Exoplanet","designation":"HD 43691 b"},{"catalog":"Host star","designation":"HD 43691"}],"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."}