{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T14:30:22.500Z","years_from_j2000":26.667,"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-7552","name":"HD 7552","class":"k0iii_orange_giant","category":"star","object_type":"K0III orange giant","mag":8.01,"mag_band":"V","abs_mag":0.46,"abs_mag_band":"V","distance_ly":1055.5222727603,"distance_method":"parallax","ra_deg":18.84057,"dec_deg":-21.729421,"epoch_ra_deg":19.165752,"epoch_dec_deg":-21.587577,"epoch_moved_arcsec":1.418,"pm_ra_mas_yr":-43.44,"pm_dec_mas_yr":-30.67,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-7552","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"K0III","color_index_bv":1.073,"luminosity_solar":57.016427228074754,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","proper_motion_ra_mas_yr":-43.44,"proper_motion_dec_mas_yr":-30.67},"designations":[{"catalog":"HD","designation":"HD 7552"},{"catalog":"HIP","designation":"HIP 5871"}],"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."}