{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:49:08.700Z","years_from_j2000":26.68,"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":"tres-3-b","name":"TrES-3 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":754.5203795185827,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":268.0291106,"dec_deg":37.5463268,"epoch_ra_deg":268.258489,"epoch_dec_deg":37.539193,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TrES-3","semi_major_axis_km":3413823.4093739996,"periapsis_km":null,"mass_kg":3.6252850607854007e+27,"mass_msun":0.00182321,"constellation":"Hercules","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/tres-3-b","radius_km":95512.0475,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TrES-3","host_v_mag":12.362,"eccentricity":0,"uncertainties":{"mass_kg":[1.5184236803859583e+26,1.4235259329667531e+26],"radius_km":[2646.9115,2213.2007],"distance_ly":[4.200894144991655,4.249817601649166],"host_mass_solar":[0.048,0.028],"inclination_deg":[0.16,0.16],"host_radius_solar":[0.022,0.015],"host_temperature_k":[75,75],"semi_major_axis_km":[59839.14828,34407.510260999996],"argument_of_periastron_deg":[0.32,0.38]},"host_mass_solar":0.928,"inclination_deg":81.85,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.829,"planets_in_system":1,"discovery_facility":"TrES","host_spectral_type":"G4 V","host_temperature_k":5650,"orbital_period_days":1.30618581,"transit_midpoint_bjd":2454185.9104,"equilibrium_temperature_k":1638,"argument_of_periastron_deg":270.5},"designations":[{"catalog":"Exoplanet","designation":"TrES-3 b"},{"catalog":"Host star","designation":"TrES-3"}],"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."}