{"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":"2026-09-05T07:52:08.340Z","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":"toi-663-b","name":"TOI-663 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":209.49285065848605,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":160.0658525,"dec_deg":-8.5110827,"epoch_ra_deg":160.40204,"epoch_dec_deg":-8.651029,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-663","semi_major_axis_km":4413137.185649999,"periapsis_km":null,"mass_kg":2.6576147011671636e+25,"mass_msun":0.0000133655,"constellation":"Sextans","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-663-b","radius_km":14478.287,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-663","host_v_mag":13.667,"uncertainties":{"mass_kg":[3.9416307927423103e+24,3.762465756708569e+24],"radius_km":[574.029,637.8100000000001],"distance_ly":[0.5867553235124214,0.5867553235124214],"host_mass_solar":[0.012,0.012],"inclination_deg":[0.6,0.57],"host_radius_solar":[0.015,0.015],"host_temperature_k":[70,70],"semi_major_axis_km":[164557.65777,164557.65777],"orbital_period_days":[0.000003,0.0000032]},"host_mass_solar":0.514,"inclination_deg":89.14,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.512,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M1 V","host_temperature_k":3681,"orbital_period_days":2.598902,"transit_midpoint_bjd":2458544.38918,"equilibrium_temperature_k":674},"designations":[{"catalog":"Exoplanet","designation":"TOI-663 b"}],"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."}