{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:08:22.050Z","years_from_j2000":26.664,"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-9869","name":"HD 9869","class":"a2_white_star","category":"star","object_type":"A2 white star","mag":7.99,"mag_band":"V","abs_mag":1.364,"abs_mag_band":"V","distance_ly":689.5483982955188,"distance_method":"parallax","ra_deg":24.488205,"dec_deg":59.298994,"epoch_ra_deg":24.934565,"epoch_dec_deg":59.435661,"epoch_moved_arcsec":0.861,"pm_ra_mas_yr":30.74,"pm_dec_mas_yr":-9.89,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-9869","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"A2","color_index_bv":0.24,"luminosity_solar":24.797048987986994,"radial_velocity_km_s":-6,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","proper_motion_ra_mas_yr":30.74,"proper_motion_dec_mas_yr":-9.89},"designations":[{"catalog":"HD","designation":"HD 9869"},{"catalog":"HIP","designation":"HIP 7605"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}