{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:13:59.182Z","years_from_j2000":26.682,"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-172-b","name":"TOI-172 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1118.1651712900887,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":316.6318791,"dec_deg":-26.6928654,"epoch_ra_deg":317.028292,"epoch_dec_deg":-26.58535,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-172","semi_major_axis_km":13673245.381979998,"periapsis_km":null,"mass_kg":1.0287886894737127e+28,"mass_msun":0.00517393,"constellation":"Capricornus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/toi-172-b","radius_km":68989.8985985,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-172","host_v_mag":11.299,"eccentricity":0.3806,"uncertainties":{"mass_kg":[3.7962682268402685e+26,4.175895049524295e+26],"radius_km":[2073.2715641,2287.7479328000004],"distance_ly":[23.062517468350926,24.04098660150116],"eccentricity":[0.009,0.0093],"host_mass_solar":[0.061,0.065],"inclination_deg":[1,1.1],"host_radius_solar":[0.044,0.047],"host_temperature_k":[50,50],"semi_major_axis_km":[254316.38018999997,254316.38018999997],"orbital_period_days":[0.00079,0.00064],"argument_of_periastron_deg":[1.7,1.7]},"host_mass_solar":1.128,"inclination_deg":88.2,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.777,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5645,"orbital_period_days":9.47725,"periastron_epoch_bjd":2458326.549,"transit_midpoint_bjd":2458345.8734,"equilibrium_temperature_k":1198,"argument_of_periastron_deg":57.1},"designations":[{"catalog":"Exoplanet","designation":"TOI-172 b"},{"catalog":"Host star","designation":"TOI-172"}],"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."}