{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:15:25.167Z","years_from_j2000":26.67,"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-90041","name":"HD 90041","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":9.19,"mag_band":"V","abs_mag":2.605,"abs_mag_band":"V","distance_ly":676.6730491287726,"distance_method":"parallax","ra_deg":156.010005,"dec_deg":30.203808,"epoch_ra_deg":156.389287,"epoch_dec_deg":30.068364,"epoch_moved_arcsec":3.353,"pm_ra_mas_yr":-114.12,"pm_dec_mas_yr":52.78,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-90041","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"10240+3012","age_years":4772321000,"companions":[{"measured":2015,"magnitude":11.15,"components":"AB","discoverer_code":"LDS1239","separation_arcsec":59.6,"position_angle_deg":122},{"measured":2015,"magnitude":13.29,"components":"AC","discoverer_code":"LDS1239","separation_arcsec":102.7,"position_angle_deg":133}],"mass_solar":1.241,"radius_solar":2.08,"spectral_type":"G5","color_index_bv":0.545,"luminosity_solar":7.90678627999825,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.806,"surface_temperature_k":5904,"proper_motion_ra_mas_yr":-114.12,"proper_motion_dec_mas_yr":52.78,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":4.6387},"designations":[{"catalog":"HD","designation":"HD 90041"},{"catalog":"HIP","designation":"HIP 50926"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}