{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:01:57.320Z","years_from_j2000":26.685,"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-30-b","name":"NGTS-30 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":777.4817885098415,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":173.714867,"dec_deg":-24.6054801,"epoch_ra_deg":174.050766,"epoch_dec_deg":-24.753972,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-30","semi_major_axis_km":61035931.24559999,"periapsis_km":null,"mass_kg":1.8221996157664518e+27,"mass_msun":0.00091641,"constellation":"Crater","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/ngts-30-b","radius_km":66344.575819429,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-30","host_v_mag":12.537,"eccentricity":0.294,"uncertainties":{"mass_kg":[1.0629497757443202e+26,1.0629497757443202e+26],"radius_km":[2287.743978378,2287.743978378],"distance_ly":[7.791875863653,7.951692488734205],"eccentricity":[0.01,0.014],"host_mass_solar":[0.06,0.06],"inclination_deg":[0.028,0.028],"host_radius_solar":[0.029,0.029],"host_temperature_k":[80,80],"semi_major_axis_km":[2842359.5432999996,2842359.5432999996],"orbital_period_days":[0.00009,0.0001],"argument_of_periastron_deg":[5.8,4.8]},"host_mass_solar":0.94,"inclination_deg":89.483,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.913,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5455,"orbital_period_days":98.29838,"transit_midpoint_bjd":2459287.6,"equilibrium_temperature_k":500,"argument_of_periastron_deg":3.4},"designations":[{"catalog":"Exoplanet","designation":"NGTS-30 b"},{"catalog":"Host star","designation":"NGTS-30"}],"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."}