{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T01:18:13.442Z","years_from_j2000":26.674,"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-146452","name":"HD 146452","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":7.26,"mag_band":"V","abs_mag":0.054,"abs_mag_band":"V","distance_ly":900.9844886524413,"distance_method":"parallax","ra_deg":243.99938999999998,"dec_deg":11.425268,"epoch_ra_deg":244.316221,"epoch_dec_deg":11.35837,"epoch_moved_arcsec":1.683,"pm_ra_mas_yr":-44.42,"pm_dec_mas_yr":44.8,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-146452","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16160+1126","age_years":376758660,"companions":[{"measured":2019,"magnitude":10.6,"components":"AB","discoverer_code":"ENG  56","separation_arcsec":61.6,"position_angle_deg":252},{"measured":2019,"magnitude":12.34,"components":"AC","discoverer_code":"BUP 166","separation_arcsec":86.8,"position_angle_deg":342}],"mass_solar":3.002,"radius_solar":10.368,"spectral_type":"K0","color_index_bv":0.994,"luminosity_solar":82.87050779069826,"radial_velocity_km_s":-25.9,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":2.742,"surface_temperature_k":5174,"proper_motion_ra_mas_yr":-44.42,"proper_motion_dec_mas_yr":44.8,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":59.2622},"designations":[{"catalog":"HD","designation":"HD 146452"},{"catalog":"HIP","designation":"HIP 79704"}],"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."}