{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T17:55:13.635Z","years_from_j2000":26.684,"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":"toi-3688-a-b","name":"TOI-3688 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1292.8121268660732,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":39.2823371,"dec_deg":54.8512152,"epoch_ra_deg":39.759563,"epoch_dec_deg":54.968069,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-3688 A","semi_major_axis_km":6821662.9039199995,"periapsis_km":null,"mass_kg":1.8601621077615863e+27,"mass_msun":0.000935502,"constellation":"Perseus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-3688-a-b","radius_km":83431.163789488,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-3688 A","host_v_mag":12.241,"eccentricity":0,"uncertainties":{"mass_kg":[2.0879370597323927e+26,1.8981245997567207e+26],"radius_km":[3145.6479862150004,3431.6159675669996],"distance_ly":[19.096455915315328,19.667229576319627],"host_mass_solar":[0.076,0.072],"inclination_deg":[1,1.2],"host_radius_solar":[0.035,0.038],"host_temperature_k":[100,100],"semi_major_axis_km":[146605.913286,133142.10492299998],"orbital_period_days":[0.000012,0.000012]},"host_mass_solar":1.199,"inclination_deg":87.9,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.302,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5950,"orbital_period_days":3.246075,"transit_midpoint_bjd":2459108.0507,"equilibrium_temperature_k":1534},"designations":[{"catalog":"Exoplanet","designation":"TOI-3688 A b"},{"catalog":"Host star","designation":"TOI-3688 A"}],"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."}