{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T18:02:15.473Z","years_from_j2000":26.654,"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":"24-boo-b","name":"24 Boo b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":313.06543918432646,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":217.1555242,"dec_deg":49.8446488,"epoch_ra_deg":217.394599,"epoch_dec_deg":49.72433,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"24 Boo","semi_major_axis_km":29021986.915799998,"periapsis_km":null,"mass_kg":1.676044021579212e+27,"mass_msun":0.000842907,"constellation":"Boötes","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/24-boo-b","radius_km":88655.59000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"24 Boo","host_v_mag":5.59,"eccentricity":0.032,"uncertainties":{"mass_kg":[8.161935778356682e+25,6.833248557929761e+25],"distance_ly":[2.0771268914890806,2.0771268914890806],"eccentricity":[0.023,0.039],"host_mass_solar":[0.18,0.27],"host_radius_solar":[1.28,1.45],"orbital_period_days":[0.01,0],"argument_of_periastron_deg":[95.45,89.32]},"host_mass_solar":1.05,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":12.19,"planets_in_system":1,"discovery_facility":"Okayama Astrophysical Observatory","host_spectral_type":"G3 IV","host_temperature_k":4816,"orbital_period_days":30.33,"periastron_epoch_bjd":2455129.2,"equilibrium_temperature_k":1840.86,"argument_of_periastron_deg":-179.2},"designations":[{"catalog":"Exoplanet","designation":"24 Boo b"},{"catalog":"Host star","designation":"24 Boo"}],"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":"2026-08-27T16:03:54.983Z","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."}