{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T04:48:04.625Z","years_from_j2000":26.677,"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-1-b","name":"NGTS-1 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":711.415552639538,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":82.7142134,"dec_deg":-36.6309812,"epoch_ra_deg":82.948298,"epoch_dec_deg":-36.610051,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-1","semi_major_axis_km":4876890.5848199995,"periapsis_km":null,"mass_kg":1.541284900097149e+27,"mass_msun":0.000775134,"constellation":"Columba","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/ngts-1-b","radius_km":95084.523457,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-1","host_v_mag":15.667,"eccentricity":0.016,"uncertainties":{"mass_kg":[1.4236005850651006e+26,1.2527685148572886e+26],"radius_km":[23592.400557,43610.194969000004],"distance_ly":[3.382241636922629,3.382241636922629],"eccentricity":[0.012,0.023],"host_mass_solar":[0.062,0.023],"inclination_deg":[0.73,0.61],"host_radius_solar":[0.077,0.077],"host_temperature_k":[63,71],"semi_major_axis_km":[673190.4181499999,703109.99229],"orbital_period_days":[0.00002,0.00002]},"host_mass_solar":0.617,"inclination_deg":85.27,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.573,"planets_in_system":1,"discovery_facility":"Next-Generation Transit Survey (NGTS)","host_spectral_type":"M0.5","host_temperature_k":3916,"orbital_period_days":2.647298,"transit_midpoint_bjd":2457720.6593965,"equilibrium_temperature_k":790},"designations":[{"catalog":"Exoplanet","designation":"NGTS-1 b"},{"catalog":"Host star","designation":"NGTS-1"}],"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."}