{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:27:28.400Z","years_from_j2000":26.682,"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-49-828-b","name":"BD+49 828 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1441.748175186647,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":45.6406187,"dec_deg":49.7299481,"epoch_ra_deg":46.109928,"epoch_dec_deg":49.835729,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD+49 828","semi_major_axis_km":628311056.9399999,"periapsis_km":null,"mass_kg":3.0368473607719166e+27,"mass_msun":0.00152727,"constellation":"Perseus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/bd-49-828-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD+49 828","host_v_mag":9.381,"eccentricity":0.35,"uncertainties":{"mass_kg":[3.798298763915317e+26,7.590625359962842e+26],"distance_ly":[24.96400915043954,24.96400915043954],"eccentricity":[0.1,0.24],"host_mass_solar":[0.22,0.22],"host_radius_solar":[1.3,1.3],"host_temperature_k":[30,30],"semi_major_axis_km":[29919574.14,47871318.624],"orbital_period_days":[180,300],"argument_of_periastron_deg":[30,32]},"host_mass_solar":1.52,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":7.6,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K0","host_temperature_k":4943,"orbital_period_days":2590,"periastron_epoch_bjd":2455470.5,"equilibrium_temperature_k":320.63,"argument_of_periastron_deg":170},"designations":[{"catalog":"Exoplanet","designation":"BD+49 828 b"},{"catalog":"Host star","designation":"BD+49 828"}],"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."}