{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T08:45:11.760Z","years_from_j2000":26.677,"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-12111","name":"48 Cas","class":"a3va_white_main_sequence_star","category":"star","object_type":"A3Va white main-sequence star","mag":4.49,"mag_band":"V","abs_mag":1.754,"abs_mag_band":"V","distance_ly":115.00567419032318,"distance_method":"parallax","ra_deg":30.489659999999997,"dec_deg":70.90702,"epoch_ra_deg":31.048676,"epoch_dec_deg":71.036595,"epoch_moved_arcsec":1.481,"pm_ra_mas_yr":-54.46,"pm_dec_mas_yr":-10.69,"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-12111","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02020+7054","companions":[{"measured":2013,"magnitude":6.74,"components":"AB","discoverer_code":"BU  513","separation_arcsec":0.6,"position_angle_deg":320},{"measured":2015,"magnitude":13.2,"components":"AC","discoverer_code":"BU  513","separation_arcsec":22.8,"position_angle_deg":52},{"measured":2015,"magnitude":12.6,"components":"AD","discoverer_code":"BU  513","separation_arcsec":54,"position_angle_deg":87}],"spectral_type":"A3Va","color_index_bv":0.164,"luminosity_solar":17.314103128901543,"radial_velocity_km_s":-5,"spectral_type_source":"SIMBAD (1989ApJS...70..623G, quality C)","surface_temperature_k":8204,"proper_motion_ra_mas_yr":-54.46,"proper_motion_dec_mas_yr":-10.69,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"48 Cas"},{"catalog":"HD","designation":"HD 12111"},{"catalog":"HIP","designation":"HIP 9480"},{"catalog":"HR","designation":"HR 575"}],"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."}