{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T03:55:14.157Z","years_from_j2000":26.688,"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-205805","name":"HD 205805","class":"sdb_blue_white_subdwarf","category":"star","object_type":"sdB blue-white subdwarf","mag":10.18,"mag_band":"V","abs_mag":3.05,"abs_mag_band":"V","distance_ly":869.750449296775,"distance_method":"parallax","ra_deg":324.794145,"dec_deg":-46.097647,"epoch_ra_deg":325.230195,"epoch_dec_deg":-45.976484,"epoch_moved_arcsec":2.056,"pm_ra_mas_yr":76.39,"pm_dec_mas_yr":-9.93,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Grus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-205805","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"sdB","color_index_bv":-0.241,"luminosity_solar":5.248074602497725,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1968ApJ...152..443S, quality D)","surface_gravity_log_g":5,"surface_temperature_k":25711,"proper_motion_ra_mas_yr":76.39,"proper_motion_dec_mas_yr":-9.93,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 205805"},{"catalog":"HIP","designation":"HIP 106917"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}