{"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":"2026-09-08T21:04:06.469Z","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":"eps-crb-b","name":"ε CrB b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":227.87991645226745,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":239.3965057,"dec_deg":26.8776171,"epoch_ra_deg":239.676161,"epoch_dec_deg":26.799772,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"ε CrB","semi_major_axis_km":194477231.91,"periapsis_km":null,"mass_kg":1.2717498559914897e+28,"mass_msun":0.00639581,"constellation":"Corona Borealis","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/eps-crb-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"ε CrB","host_v_mag":4.12577,"eccentricity":0.11,"uncertainties":{"mass_kg":[5.6944023402604025e+26,5.6944023402604025e+26],"distance_ly":[3.396918673919883,3.4996579329006567],"eccentricity":[0.03,0.03],"host_mass_solar":[0.1,0.1],"host_temperature_k":[15,15],"orbital_period_days":[0.5,0.5],"argument_of_periastron_deg":[33.3,33.3]},"host_mass_solar":1.7,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":21,"planets_in_system":1,"discovery_facility":"Bohyunsan Optical Astronomical Observatory","host_spectral_type":"K2 III","host_temperature_k":4406,"orbital_period_days":417.9,"periastron_epoch_bjd":2451235.3,"equilibrium_temperature_k":853.92,"argument_of_periastron_deg":133.1},"designations":[{"catalog":"Exoplanet","designation":"eps CrB b"},{"catalog":"Host star","designation":"eps CrB"}],"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."}