{"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":"2026-08-27T17:05:56.145Z","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":"barnard-b","name":"Barnard b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":5.957409317185177,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":269.4486144,"dec_deg":4.7379808,"epoch_ra_deg":269.780177,"epoch_dec_deg":4.734664,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Barnard's star","semi_major_axis_km":3425791.23903,"periapsis_km":null,"mass_kg":1.7856781924696224e+24,"mass_msun":8.98043e-7,"constellation":"Ophiuchus","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/barnard-b","radius_km":4592.232,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Barnard's star","host_v_mag":9.54,"eccentricity":0.03,"uncertainties":{"mass_kg":[1.5527636456257584e+23,1.5527636456257584e+23],"distance_ly":[0.0031800246827382484,0.0031800246827382484],"eccentricity":[0.02,0.03],"host_mass_solar":[0.007,0.007],"host_radius_solar":[0.006,0.006],"host_temperature_k":[28,28],"semi_major_axis_km":[44879.361209999995,44879.361209999995],"orbital_period_days":[0.0004,0.0004],"argument_of_periastron_deg":[121.4,117.7]},"host_mass_solar":0.162,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.185,"planets_in_system":4,"discovery_facility":"Paranal Observatory","host_spectral_type":"M3.5-4 V","host_temperature_k":3195,"orbital_period_days":3.1542,"periastron_epoch_bjd":2460243.38,"transit_midpoint_bjd":2460139.204,"equilibrium_temperature_k":438,"argument_of_periastron_deg":3.8},"designations":[{"catalog":"Exoplanet","designation":"Barnard b"}],"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."}