{"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":"2026-09-08T04:27:59.883Z","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":"tyc-8998-760-1-c","name":"TYC 8998-760-1 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":308.6016629988951,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":201.3001096,"dec_deg":-64.9391566,"epoch_ra_deg":201.757557,"epoch_dec_deg":-65.079159,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TYC 8998-760-1","semi_major_axis_km":47871318624,"periapsis_km":null,"mass_kg":1.1388804680520804e+28,"mass_msun":0.00572759,"constellation":"Musca","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/tyc-8998-760-1-c","radius_km":78641.33519000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TYC 8998-760-1","host_v_mag":11.124,"uncertainties":{"mass_kg":[1.898134113420134e+27,1.898134113420134e+27],"radius_km":[21447.63687,42895.27374],"distance_ly":[0.9223702361829503,0.9275887382264182],"host_radius_solar":[0.01,0.01],"host_temperature_k":[10,10]},"host_mass_solar":1,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.02,"planets_in_system":2,"discovery_facility":"Paranal Observatory","host_spectral_type":"K3 IV","host_temperature_k":4573,"equilibrium_temperature_k":1240},"designations":[{"catalog":"Exoplanet","designation":"TYC 8998-760-1 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."}