{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T17:24:05.912Z","years_from_j2000":26.686,"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":"tic-172900988-b","name":"TIC 172900988 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":818.5089992628306,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":128.6616644,"dec_deg":31.5539793,"epoch_ra_deg":129.078255,"epoch_dec_deg":31.461901,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TIC 172900988 Aa","semi_major_axis_km":135058453.646667,"periapsis_km":null,"mass_kg":5.62578213145948e+27,"mass_msun":0.00282929,"constellation":"Cancer","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/tic-172900988-b","radius_km":71753.625,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TIC 172900988 Aa","host_v_mag":10.141,"eccentricity":0.0271,"uncertainties":{"mass_kg":[3.3444140059631724e+25,3.3444140059631724e+25],"radius_km":[2806.364,2806.364],"distance_ly":[10.345680301175102,10.61312853090283],"eccentricity":[0.0011,0.0011],"host_mass_solar":[0.0007,0.0007],"inclination_deg":[0.19,0.19],"host_radius_solar":[0.0016,0.0016],"host_temperature_k":[100,100],"semi_major_axis_km":[23935.659312,23935.659312],"orbital_period_days":[0.011,0.011],"argument_of_periastron_deg":[5.5,5.5]},"host_mass_solar":1.2384,"inclination_deg":91.79,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.3842,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"F9","host_temperature_k":6050,"orbital_period_days":200.452,"periastron_epoch_bjd":2459442,"transit_midpoint_bjd":2458937.5,"equilibrium_temperature_k":361.24,"argument_of_periastron_deg":159.4},"designations":[{"catalog":"Exoplanet","designation":"TIC 172900988 b"},{"catalog":"Host star","designation":"TIC 172900988 Aa"}],"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."}