{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:42:34.787Z","years_from_j2000":26.681,"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":"bd-20-274-b","name":"BD+20 274 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":4313.450710941704,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":25.9203179,"dec_deg":21.0052692,"epoch_ra_deg":26.289107,"epoch_dec_deg":21.140588,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD+20 274","semi_major_axis_km":194477231.91,"periapsis_km":null,"mass_kg":7.972163276364563e+27,"mass_msun":0.00400932,"constellation":"Pisces","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/bd-20-274-b","radius_km":82915.3,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD+20 274","host_v_mag":9.367,"eccentricity":0.21,"uncertainties":{"distance_ly":[262.6700387941793,262.6700387941793],"eccentricity":[0.06,0.06],"host_mass_solar":[0.2,0.2],"host_radius_solar":[0.9,0.9],"host_temperature_k":[10,10],"orbital_period_days":[5.4,5.4],"argument_of_periastron_deg":[38.1,38.1]},"host_mass_solar":0.8,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":17.3,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K5 III","host_temperature_k":4296,"orbital_period_days":578.2,"periastron_epoch_bjd":2453921,"equilibrium_temperature_k":755.7,"argument_of_periastron_deg":108.5},"designations":[{"catalog":"Exoplanet","designation":"BD+20 274 b"},{"catalog":"Host star","designation":"BD+20 274"}],"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."}