{"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":"2026-09-06T22:29:31.644Z","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":"ngts-27-b","name":"NGTS-27 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3072.790988872537,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":206.0265266,"dec_deg":-32.5229747,"epoch_ra_deg":206.411683,"epoch_dec_deg":-32.658168,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-27","semi_major_axis_km":6672065.03322,"periapsis_km":null,"mass_kg":1.1255878876497632e+27,"mass_msun":0.000566074,"constellation":"Centaurus","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/ngts-27-b","radius_km":99802.83174238601,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-27","host_v_mag":13.523,"eccentricity":0,"uncertainties":{"mass_kg":[1.3666497115859523e+26,1.803218369470276e+26],"radius_km":[2502.2199643920003,2716.696014187],"distance_ly":[90.91282872476506,96.51619529393871],"host_mass_solar":[0.06,0.06],"inclination_deg":[2.1,2.4],"host_radius_solar":[0.03,0.03],"host_temperature_k":[80,80],"semi_major_axis_km":[538552.3345199999,388954.46381999995],"orbital_period_days":[0.0000057,0.0000059]},"host_mass_solar":1.07,"inclination_deg":86.2,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.77,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5700,"orbital_period_days":3.3704181,"transit_midpoint_bjd":2458540.6573,"equilibrium_temperature_k":1783},"designations":[{"catalog":"Exoplanet","designation":"NGTS-27 b"},{"catalog":"Host star","designation":"NGTS-27"}],"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."}