{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T06:13:59.905Z","years_from_j2000":26.677,"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-181326","name":"HD 181326","class":"k0iii_orange_giant","category":"star","object_type":"K0III orange giant","mag":8.18,"mag_band":"V","abs_mag":0.447,"abs_mag_band":"V","distance_ly":1148.4380278006236,"distance_method":"parallax","ra_deg":290.66055,"dec_deg":-50.803991,"epoch_ra_deg":291.177033,"epoch_dec_deg":-50.752986,"epoch_moved_arcsec":1.016,"pm_ra_mas_yr":18.5,"pm_dec_mas_yr":-33.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Telescopium","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-181326","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":345424100,"mass_solar":3.102,"radius_solar":11.659,"spectral_type":"K0III","color_index_bv":1.044,"luminosity_solar":57.70321353329296,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":2.497,"surface_temperature_k":4772,"proper_motion_ra_mas_yr":18.5,"proper_motion_dec_mas_yr":-33.27,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":68.1337},"designations":[{"catalog":"HD","designation":"HD 181326"},{"catalog":"HIP","designation":"HIP 95242"}],"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."}