{"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":"2026-09-07T15:42:12.832Z","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-1855-b","name":"TOI-1855 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":576.7521074078488,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":205.3539534,"dec_deg":17.6868719,"epoch_ra_deg":205.678412,"epoch_dec_deg":17.550887,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1855","semi_major_axis_km":3587356.939386,"periapsis_km":null,"mass_kg":2.1505751715183924e+27,"mass_msun":0.00108156,"constellation":"Boötes","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-1855-b","radius_km":117961.79970629602,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1855","host_v_mag":11.197,"eccentricity":0.033,"uncertainties":{"mass_kg":[1.727293385957781e+26,1.8221996156470083e+26],"radius_km":[26452.039933366003,37175.839871876],"distance_ly":[3.8160296192858976,3.8682146397205766],"eccentricity":[0.023,0.038],"host_mass_solar":[0.045,0.058],"inclination_deg":[1,1],"host_radius_solar":[0.033,0.031],"host_temperature_k":[83,89],"semi_major_axis_km":[55351.212158999995,68815.02052199999],"orbital_period_days":[5.1e-7,5.1e-7],"argument_of_periastron_deg":[110,120]},"host_mass_solar":0.987,"inclination_deg":78.1,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.041,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5359,"orbital_period_days":1.36414864,"transit_midpoint_bjd":2459243.19743,"equilibrium_temperature_k":1701,"argument_of_periastron_deg":-100},"designations":[{"catalog":"Exoplanet","designation":"TOI-1855 b"},{"catalog":"Host star","designation":"TOI-1855"}],"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."}