{"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":"2026-09-07T19:10:45.082Z","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-6-b","name":"NGTS-6 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1005.4161730771876,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":75.795382,"dec_deg":-30.3994612,"epoch_ra_deg":76.05492,"epoch_dec_deg":-30.360848,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-6","semi_major_axis_km":2508756.2916389997,"periapsis_km":null,"mass_kg":2.5416015778695597e+27,"mass_msun":0.00127821,"constellation":"Caelum","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/ngts-6-b","radius_km":94798.5549654,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-6","host_v_mag":14.237,"eccentricity":0,"uncertainties":{"mass_kg":[5.3147755175763755e+25,5.3147755175763755e+25],"radius_km":[8007.117764800001,6934.7359213],"distance_ly":[4.58902023447458,4.624897436023422],"host_mass_solar":[0.025,0.025],"inclination_deg":[0.21,0.262],"host_radius_solar":[0.013,0.013],"host_temperature_k":[40,44],"semi_major_axis_km":[47871.318624,47871.318624],"orbital_period_days":[8e-7,8e-7]},"host_mass_solar":0.767,"inclination_deg":78.231,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.754,"planets_in_system":1,"discovery_facility":"Next-Generation Transit Survey (NGTS)","host_temperature_k":4730,"orbital_period_days":0.882059,"transit_midpoint_bjd":2457982.3784,"equilibrium_temperature_k":1283.9},"designations":[{"catalog":"Exoplanet","designation":"NGTS-6 b"},{"catalog":"Host star","designation":"NGTS-6"}],"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."}