{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:05:45.742Z","years_from_j2000":26.68,"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":"hd-49674-b","name":"HD 49674 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":140.37737881290866,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":102.8773483,"dec_deg":40.8672284,"epoch_ra_deg":103.347943,"epoch_dec_deg":40.835531,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 49674","semi_major_axis_km":8975872.241999999,"periapsis_km":null,"mass_kg":1.8981341134201343e+26,"mass_msun":0.0000954599,"constellation":"Auriga","discovered":"2002","featured":false,"url":"https://spacecatalog.org/object/hd-49674-b","radius_km":39544.22,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 49674","host_v_mag":8.1,"eccentricity":0.09,"uncertainties":{"mass_kg":[1.898134113420134e+25,1.898134113420134e+25],"distance_ly":[0.24983578533102546,0.25081425446417566],"eccentricity":[0.09,0.09],"host_mass_solar":[0.11,0.11],"host_radius_solar":[0.01,0.01],"host_temperature_k":[21,21],"orbital_period_days":[0.00098,0.00098],"argument_of_periastron_deg":[74,48]},"host_mass_solar":1.03,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.02,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G5 V","host_temperature_k":5602,"orbital_period_days":4.94737,"periastron_epoch_bjd":2451883.7,"transit_midpoint_bjd":2454625.614,"equilibrium_temperature_k":1113.78,"argument_of_periastron_deg":17},"designations":[{"catalog":"Exoplanet","designation":"HD 49674 b"},{"catalog":"Host star","designation":"HD 49674"}],"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."}