{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T15:27:09.788Z","years_from_j2000":26.678,"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-2-b","name":"NGTS-2 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1162.3919761084792,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":215.1227617,"dec_deg":-31.2020698,"epoch_ra_deg":215.518279,"epoch_dec_deg":-31.325406,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-2","semi_major_axis_km":9424665.8541,"periapsis_km":null,"mass_kg":1.404619243930899e+27,"mass_msun":0.000706403,"constellation":"Centaurus","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/ngts-2-b","radius_km":114029.9360255,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-2","host_v_mag":10.789,"eccentricity":0,"uncertainties":{"mass_kg":[2.277760936104161e+26,2.4675743474461742e+26],"radius_km":[3217.1455305,3360.1297763000002],"distance_ly":[25.58696783187852,26.74482297277296],"host_mass_solar":[0.22,0.19],"inclination_deg":[1.2,1],"host_radius_solar":[0.044,0.047],"host_temperature_k":[89,94],"semi_major_axis_km":[448793.61209999997,359034.88967999996],"orbital_period_days":[0.000061,0.000061]},"host_mass_solar":1.64,"inclination_deg":88.5,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.702,"planets_in_system":1,"discovery_facility":"Next-Generation Transit Survey (NGTS)","host_spectral_type":"F5 V","host_temperature_k":6478,"orbital_period_days":4.511164,"transit_midpoint_bjd":2457759.1261,"equilibrium_temperature_k":1468},"designations":[{"catalog":"Exoplanet","designation":"NGTS-2 b"},{"catalog":"Host star","designation":"NGTS-2"}],"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."}