{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T17:58:41.500Z","years_from_j2000":26.676,"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-106515","name":"HD 106515","class":"g5v_yellow_main_sequence_star","category":"star","object_type":"G5V yellow main-sequence star","mag":7.34,"mag_band":"V","abs_mag":4.608,"abs_mag_band":"V","distance_ly":114.76301384530193,"distance_method":"parallax","ra_deg":183.777375,"dec_deg":-7.257327,"epoch_ra_deg":184.12066,"epoch_dec_deg":-7.407053,"epoch_moved_arcsec":6.791,"pm_ra_mas_yr":-248.62,"pm_dec_mas_yr":-54.83,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-106515","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12151-0715","companions":[{"measured":2024,"magnitude":8.3,"components":"AB","discoverer_code":"STF1619","separation_arcsec":6.8,"position_angle_deg":265},{"measured":2015,"magnitude":10.46,"components":"AC","discoverer_code":"STF1619","separation_arcsec":99.1,"position_angle_deg":163}],"radius_solar":0.981,"spectral_type":"G5V","color_index_bv":0.815,"luminosity_solar":1.2496833972112191,"radial_velocity_km_s":21.6,"spectral_type_source":"SIMBAD (1935ApJ....81..187A, quality D)","surface_gravity_log_g":4.431,"surface_temperature_k":5293,"proper_motion_ra_mas_yr":-248.62,"proper_motion_dec_mas_yr":-54.83,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.6788},"designations":[{"catalog":"HD","designation":"HD 106515"},{"catalog":"HIP","designation":"HIP 59743"}],"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."}