{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T20:49:54.917Z","years_from_j2000":26.665,"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-148554","name":"HD 148554","class":"a3_white_star","category":"star","object_type":"A3 white star","mag":6.88,"mag_band":"V","abs_mag":1.264,"abs_mag_band":"V","distance_ly":433.1425188917673,"distance_method":"parallax","ra_deg":246.977655,"dec_deg":25.984353,"epoch_ra_deg":247.254912,"epoch_dec_deg":25.92421,"epoch_moved_arcsec":0.594,"pm_ra_mas_yr":-16.18,"pm_dec_mas_yr":15.3,"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-148554","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16279+2559","companions":[{"measured":2021,"magnitude":8.1,"components":null,"discoverer_code":"STF2049","separation_arcsec":1.1,"position_angle_deg":194}],"spectral_type":"A3","color_index_bv":0.1,"luminosity_solar":27.18942354402216,"radial_velocity_km_s":-45,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","proper_motion_ra_mas_yr":-16.18,"proper_motion_dec_mas_yr":15.3},"designations":[{"catalog":"HD","designation":"HD 148554"},{"catalog":"HIP","designation":"HIP 80641"}],"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."}