{"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":"2026-09-07T15:51:25.994Z","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":"ngts-13-b","name":"NGTS-13 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2112.1723942747444,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":176.2402326,"dec_deg":-38.1397158,"epoch_ra_deg":176.575306,"epoch_dec_deg":-38.28886,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-13","semi_major_axis_km":8212923.101429999,"periapsis_km":null,"mass_kg":9.186969108953449e+27,"mass_msun":0.00462026,"constellation":"Centaurus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/ngts-13-b","radius_km":81644.0043518,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-13","host_v_mag":12.744,"eccentricity":0.086,"uncertainties":{"mass_kg":[8.35179009904859e+26,8.35179009904859e+26],"radius_km":[3288.6376534,3288.6376534],"distance_ly":[46.973041518765385,49.11588892036439],"eccentricity":[0.034,0.034],"host_mass_solar":[0.18,0.11],"inclination_deg":[1.2,1.2],"host_radius_solar":[0.057,0.057],"host_temperature_k":[73,73],"semi_major_axis_km":[373994.67675,224396.80604999998],"orbital_period_days":[0.000023,0.000023],"argument_of_periastron_deg":[24.2,24.2]},"host_mass_solar":1.3,"inclination_deg":88.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.788,"planets_in_system":1,"discovery_facility":"Next-Generation Transit Survey (NGTS)","host_temperature_k":5819,"orbital_period_days":4.119027,"transit_midpoint_bjd":2458572.8247,"equilibrium_temperature_k":1605,"argument_of_periastron_deg":-146.4},"designations":[{"catalog":"Exoplanet","designation":"NGTS-13 b"},{"catalog":"Host star","designation":"NGTS-13"}],"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."}