{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T02:10:48.909Z","years_from_j2000":26.671,"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-157243","name":"HD 157243","class":"b5_6iii_blue_white_giant","category":"star","object_type":"B5/6III blue-white giant","mag":5.1,"mag_band":"V","abs_mag":-1.673,"abs_mag_band":"V","distance_ly":737.9102136706022,"distance_method":"parallax","ra_deg":261.05454,"dec_deg":-44.162576,"epoch_ra_deg":261.541732,"epoch_dec_deg":-44.18769,"epoch_moved_arcsec":0.832,"pm_ra_mas_yr":-6.87,"pm_dec_mas_yr":-30.41,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-157243","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"B5/6III","color_index_bv":-0.052,"luminosity_solar":406.6305463404283,"radial_velocity_km_s":13,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","proper_motion_ra_mas_yr":-6.87,"proper_motion_dec_mas_yr":-30.41},"designations":[{"catalog":"HD","designation":"HD 157243"},{"catalog":"HIP","designation":"HIP 85162"},{"catalog":"HR","designation":"HR 6460"}],"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."}