{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T11:31:07.696Z","years_from_j2000":26.678,"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-99706-c","name":"HD 99706 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":478.1452497327458,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":172.1261621,"dec_deg":43.9662025,"epoch_ra_deg":172.491748,"epoch_dec_deg":43.81832,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 99706","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.0800383105360563e+28,"mass_msun":0.00543167,"constellation":"Ursa Major","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-99706-c","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 99706","host_v_mag":7.65,"eccentricity":0.411,"uncertainties":{"mass_kg":[1.8222087488833287e+27,2.714331782190792e+27],"distance_ly":[3.6594745579818615,3.6594745579818615],"eccentricity":[0.178,0.231],"host_mass_solar":[0.12,0.12],"host_radius_solar":[0.1,0.1],"host_temperature_k":[35,35],"orbital_period_days":[198,151],"argument_of_periastron_deg":[64,64]},"host_mass_solar":1.72,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":5.4,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K0","host_temperature_k":4891,"orbital_period_days":1278,"periastron_epoch_bjd":2455383,"argument_of_periastron_deg":136},"designations":[{"catalog":"Exoplanet","designation":"HD 99706 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":"2026-09-02T19:50:56.720Z","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."}