{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:12:02.256Z","years_from_j2000":26.667,"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-89744","name":"HD 89744","class":"f7v_yellow_white_main_sequence_star","category":"star","object_type":"F7V yellow-white main-sequence star","mag":5.73,"mag_band":"V","abs_mag":2.751,"abs_mag_band":"V","distance_ly":128.6106351740217,"distance_method":"parallax","ra_deg":155.544105,"dec_deg":41.22953,"epoch_ra_deg":155.942435,"epoch_dec_deg":41.093187,"epoch_moved_arcsec":4.892,"pm_ra_mas_yr":-120.17,"pm_dec_mas_yr":-138.6,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-89744","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"10222+4114","age_years":2830232100,"companions":[{"measured":2002,"magnitude":18.4,"components":"AH","discoverer_code":"RBR  17","separation_arcsec":5.6,"position_angle_deg":54},{"measured":2015,"magnitude":null,"components":"AD","discoverer_code":"MUG   7","separation_arcsec":11.6,"position_angle_deg":209},{"measured":2015,"magnitude":null,"components":"AE","discoverer_code":"MUG   7","separation_arcsec":22,"position_angle_deg":79},{"measured":2015,"magnitude":15.9,"components":"AC","discoverer_code":"MUG   7","separation_arcsec":30.7,"position_angle_deg":223},{"measured":2015,"magnitude":13.1,"components":"A,FG","discoverer_code":"MUG   7","separation_arcsec":45.3,"position_angle_deg":67},{"measured":2016,"magnitude":14.9,"components":"AB","discoverer_code":"WIL   2","separation_arcsec":63.1,"position_angle_deg":50}],"mass_solar":1.439,"radius_solar":2.205,"spectral_type":"F7V","color_index_bv":0.531,"luminosity_solar":6.911940643980488,"radial_velocity_km_s":-6.5,"spectral_type_source":"SIMBAD (quality E)","surface_gravity_log_g":3.952,"surface_temperature_k":6127,"proper_motion_ra_mas_yr":-120.17,"proper_motion_dec_mas_yr":-138.6,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.1532},"designations":[{"catalog":"Gliese","designation":"GJ 9326"},{"catalog":"HD","designation":"HD 89744"},{"catalog":"HIP","designation":"HIP 50786"},{"catalog":"HR","designation":"HR 4067"}],"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."}