{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:06:00.702Z","years_from_j2000":26.687,"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":"mwc-758-c","name":"MWC 758 c","class":"exoplanet","category":"exoplanet","object_type":"Exoplanet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":520.340100317961,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":82.6147199,"dec_deg":25.3324076,"epoch_ra_deg":83.029184,"epoch_dec_deg":25.3534,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"MWC 758","semi_major_axis_km":14959787069.999998,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/mwc-758-c","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"MWC 758","host_v_mag":8.270001,"uncertainties":{"distance_ly":[5.5642278038476425,5.68164409982567],"host_radius_solar":[0.072893,0.08873],"host_temperature_k":[143.29,150.81]},"host_mass_solar":1.5,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":2.01446,"planets_in_system":1,"discovery_facility":"Large Binocular Telescope Observatory","host_spectral_type":"A8Ve","host_temperature_k":7314,"equilibrium_temperature_k":500},"designations":[{"catalog":"Exoplanet","designation":"MWC 758 c"},{"catalog":"Host star","designation":"MWC 758"}],"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."}