{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T10:18:15.119Z","years_from_j2000":26.686,"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-214454","name":"9 Lac","class":"a9vka7ma6_white_main_sequence_star","category":"star","object_type":"A9VkA7mA6 white main-sequence star","mag":4.64,"mag_band":"V","abs_mag":1.034,"abs_mag_band":"V","distance_ly":171.66132009436552,"distance_method":"parallax","ra_deg":339.343485,"dec_deg":51.545123,"epoch_ra_deg":339.618239,"epoch_dec_deg":51.68365,"epoch_moved_arcsec":3.079,"pm_ra_mas_yr":-51.31,"pm_dec_mas_yr":-103.34,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lacerta","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-214454","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22374+5133","companions":[{"measured":2016,"magnitude":9.77,"components":"AB","discoverer_code":"DRS  69","separation_arcsec":14.8,"position_angle_deg":215},{"measured":2003,"magnitude":10.98,"components":"AC","discoverer_code":"DRS  69","separation_arcsec":831.3,"position_angle_deg":191}],"spectral_type":"A9VkA7mA6","color_index_bv":0.254,"luminosity_solar":33.60469824606994,"metallicity_fe_h":-0.2,"radial_velocity_km_s":12,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":3.68,"surface_temperature_k":7362,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-51.31,"proper_motion_dec_mas_yr":-103.34,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"9 Lac"},{"catalog":"HD","designation":"HD 214454"},{"catalog":"HIP","designation":"HIP 111674"},{"catalog":"HR","designation":"HR 8613"}],"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."}