{"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":"2026-09-06T21:16:11.092Z","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-1690-b","name":"HD 1690 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2454.7018221528683,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":5.3055886,"dec_deg":-8.2811442,"epoch_ra_deg":5.648085,"epoch_dec_deg":-8.132041,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 1690","semi_major_axis_km":203453104.152,"periapsis_km":null,"mass_kg":1.668459885696298e+28,"mass_msun":0.00839093,"constellation":"Cetus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hd-1690-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 1690","host_v_mag":9.19,"eccentricity":0.64,"uncertainties":{"mass_kg":[6.890226831715087e+27,6.890226831715087e+27],"distance_ly":[90.9780600003084,90.9780600003084],"eccentricity":[0.04,0.04],"host_mass_solar":[1.06,1.06],"host_radius_solar":[6.18,6.18],"host_temperature_k":[31,31],"semi_major_axis_km":[13463808.362999998,13463808.362999998],"orbital_period_days":[1.7,1.7],"argument_of_periastron_deg":[8,8]},"host_mass_solar":1.86,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":21.66,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K1 III","host_temperature_k":4374,"orbital_period_days":533,"periastron_epoch_bjd":2454449,"equilibrium_temperature_k":841.73,"argument_of_periastron_deg":122},"designations":[{"catalog":"Exoplanet","designation":"HD 1690 b"},{"catalog":"Host star","designation":"HD 1690"}],"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."}