{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T08:33:48.501Z","years_from_j2000":26.674,"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":"de-cvn-b","name":"DE CVn b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":99.55108038859301,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":201.7207198,"dec_deg":45.5455449,"epoch_ra_deg":202.010358,"epoch_dec_deg":45.405939,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DE CVn","semi_major_axis_km":860187756.525,"periapsis_km":null,"mass_kg":2.28332299616599e+28,"mass_msun":0.0114832,"constellation":"Canes Venatici","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/de-cvn-b","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DE CVn","host_v_mag":12.956,"eccentricity":0,"uncertainties":{"mass_kg":[5.708307490400045e+27,5.708307490400045e+27],"distance_ly":[0.09295456764927187,0.09262841127155513],"host_radius_solar":[0.012656,0.012656],"host_temperature_k":[157,157],"semi_major_axis_km":[302187698.81399995,302187698.81399995],"orbital_period_days":[131.5,131.5]},"host_mass_solar":0.51,"inclination_deg":86,"stars_in_system":2,"discovery_method":"Eclipse Timing Variations","host_radius_solar":0.424754,"planets_in_system":1,"discovery_facility":"Multiple Facilities","host_temperature_k":3579,"orbital_period_days":4098.1,"equilibrium_temperature_k":46.91},"designations":[{"catalog":"Exoplanet","designation":"DE CVn b"},{"catalog":"Host star","designation":"DE CVn"}],"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."}