{"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":"2026-09-05T06:23:04.539Z","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-178-d","name":"TOI-178 d","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":204.49678726462096,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":7.3020115,"dec_deg":-30.4541159,"epoch_ra_deg":7.636086,"epoch_dec_deg":-30.305558,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-178","semi_major_axis_km":8856193.94544,"periapsis_km":null,"mass_kg":3.105527291251517e+25,"mass_msun":0.0000156181,"constellation":"Sculptor","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/toi-178-d","radius_km":17188.9795,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-178","host_v_mag":11.955,"eccentricity":0.0068,"uncertainties":{"mass_kg":[2.568032183150293e+24,2.329145468438638e+24],"radius_km":[293.3926,261.50210000000004],"distance_ly":[0.6722082944742082,0.6764483273845259],"eccentricity":[0.0016,0.0016],"host_mass_solar":[0.029,0.03],"inclination_deg":[0.18,0.2],"host_radius_solar":[0.01,0.01],"host_temperature_k":[70,70],"semi_major_axis_km":[269276.16725999996,269276.16725999996],"orbital_period_days":[0.000056,0.000065],"argument_of_periastron_deg":[15.6,20.8]},"host_mass_solar":0.647,"inclination_deg":88.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.662,"planets_in_system":6,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K","host_temperature_k":4316,"orbital_period_days":6.557569,"transit_midpoint_bjd":2458747.14623,"equilibrium_temperature_k":690,"argument_of_periastron_deg":-146.3},"designations":[{"catalog":"Exoplanet","designation":"TOI-178 d"}],"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."}