{"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":"2026-09-02T13:16:46.544Z","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":"hip-90554","name":"HIP 90554","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":9.76,"mag_band":"V","abs_mag":4.541,"abs_mag_band":"V","distance_ly":360.792554248373,"distance_method":"parallax","ra_deg":277.165695,"dec_deg":16.228603,"epoch_ra_deg":277.466232,"epoch_dec_deg":16.245192,"epoch_moved_arcsec":0.935,"pm_ra_mas_yr":-27.7,"pm_dec_mas_yr":-21.5,"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/hip-90554","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18287+1614","companions":[{"measured":2016,"magnitude":10.85,"components":null,"discoverer_code":"HU  320","separation_arcsec":2,"position_angle_deg":144}],"spectral_type":"F8","color_index_bv":0.472,"luminosity_solar":1.3292295883156824,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","proper_motion_ra_mas_yr":-27.7,"proper_motion_dec_mas_yr":-21.5},"designations":[{"catalog":"HIP","designation":"HIP 90554"}],"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."}