{"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":"2026-09-08T08:10:00.071Z","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":"tic-18942729-b","name":"TIC 18942729 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":375.6310386525962,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":119.2150697,"dec_deg":16.6772341,"epoch_ra_deg":119.598651,"epoch_dec_deg":16.605796,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TIC 18942729","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":2.783030226390783e+25,"mass_msun":0.0000139963,"constellation":"Cancer","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/tic-18942729-b","radius_km":12757.559492015002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TIC 18942729","host_v_mag":12.545,"uncertainties":{"radius_km":[1405.7102150590001,1848.7686946380002],"distance_ly":[2.0091232867351394,2.028692669398144],"host_mass_solar":[0.070501,0.085507],"inclination_deg":[7.63553,3.47586],"orbital_period_days":[0.00006807615,0.00006431083]},"host_mass_solar":0.652,"inclination_deg":85.23412,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.825257,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":4360.11,"orbital_period_days":0.99817838064,"transit_midpoint_bjd":2459561.0036664},"designations":[{"catalog":"Exoplanet","designation":"TIC 18942729 b"},{"catalog":"Host star","designation":"TIC 18942729"}],"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."}