{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T09:33:16.049Z","years_from_j2000":26.686,"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-75898-b","name":"HD 75898 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":254.56668358980681,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":133.4611999,"dec_deg":33.0566885,"epoch_ra_deg":133.876815,"epoch_dec_deg":32.955067,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 75898","semi_major_axis_km":179891439.51674998,"periapsis_km":null,"mass_kg":4.840217729379638e+27,"mass_msun":0.00243422,"constellation":"Lynx","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/hd-75898-b","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 75898","host_v_mag":8.03,"eccentricity":0.105,"uncertainties":{"mass_kg":[7.592498399026883e+25,7.592498399026883e+25],"distance_ly":[0.9836876351936981,0.9915153882589],"eccentricity":[0.009,0.009],"host_mass_solar":[0.015,0.015],"host_radius_solar":[0.04,0.04],"host_temperature_k":[52,52],"semi_major_axis_km":[703109.99229,703109.99229],"orbital_period_days":[0.22,0.22],"argument_of_periastron_deg":[5.1,5.1]},"host_mass_solar":1.295,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.55,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"F8 V","host_temperature_k":6122,"orbital_period_days":422.82,"periastron_epoch_bjd":2463299,"transit_midpoint_bjd":2453303,"equilibrium_temperature_k":335.16,"argument_of_periastron_deg":-116.8},"designations":[{"catalog":"Exoplanet","designation":"HD 75898 b"}],"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."}