{"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":"2026-08-27T17:05:58.908Z","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":"cd-cet-b","name":"CD Cet b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":28.072768664646684,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":48.3530155,"dec_deg":4.7751881,"epoch_ra_deg":48.706283,"epoch_dec_deg":4.875886,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"CD Cet","semi_major_axis_km":2767560.6079499996,"periapsis_km":null,"mass_kg":2.359006307777595e+25,"mass_msun":0.0000118638,"constellation":"Cetus","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/cd-cet-b","radius_km":11608.142000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"CD Cet","host_v_mag":13.95,"uncertainties":{"mass_kg":[2.568032183150293e+24,2.5083105044723793e+24],"distance_ly":[0.021461089653761718,0.021461089653761718],"host_mass_solar":[0.01,0.01],"inclination_deg":[0.28,0.25],"host_radius_solar":[0.006,0.006],"host_temperature_k":[51,51],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.00012,0.00012]},"host_mass_solar":0.161,"inclination_deg":87.48,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.175,"planets_in_system":1,"discovery_facility":"Calar Alto Observatory","host_spectral_type":"M5.0 V","host_temperature_k":3130,"orbital_period_days":2.2907,"periastron_epoch_bjd":2458804.489,"equilibrium_temperature_k":464},"designations":[{"catalog":"Exoplanet","designation":"CD Cet b"},{"catalog":"Host star","designation":"CD Cet"}],"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."}