{"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":"2026-08-27T18:02:05.472Z","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":"hd-100546-b","name":"HD 100546 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":357.7185303883927,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":173.3555116,"dec_deg":-70.1947897,"epoch_ra_deg":173.645888,"epoch_dec_deg":-70.343012,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 100546","semi_major_axis_km":7928687147.099999,"periapsis_km":null,"mass_kg":1.6134059097932128e+28,"mass_msun":0.00811405,"constellation":"Musca","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hd-100546-b","radius_km":493295.64801000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 100546","host_v_mag":6.69,"uncertainties":{"mass_kg":[7.592498399026883e+27,7.592498399026883e+27],"radius_km":[207327.15641000003,193028.73183],"distance_ly":[1.9993385954036371,2.0254311056209766],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.049378,0.037476],"semi_major_axis_km":[299195741.4,299195741.4]},"host_mass_solar":2.4,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.85288,"planets_in_system":1,"discovery_facility":"Paranal Observatory","host_spectral_type":"B9 Vne","host_temperature_k":10500,"equilibrium_temperature_k":94.67},"designations":[{"catalog":"Exoplanet","designation":"HD 100546 b"},{"catalog":"Host star","designation":"HD 100546"}],"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."}