{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T22:30:21.005Z","years_from_j2000":26.654,"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-4768","name":"HIP 4768","class":"a0ia_white_supergiant","category":"star","object_type":"A0Ia white supergiant","mag":11.42,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":15.320835000000002,"dec_deg":-72.291982,"epoch_ra_deg":15.547801,"epoch_dec_deg":-72.147319,"epoch_moved_arcsec":0.1,"pm_ra_mas_yr":3.57,"pm_dec_mas_yr":-1.18,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Tucana","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-4768","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01013-7217","companions":[{"measured":2016,"magnitude":13.51,"components":null,"discoverer_code":"HDS 133","separation_arcsec":19.3,"position_angle_deg":48}],"spectral_type":"A0Ia","color_index_bv":0.041,"variable_mag_max":11.276,"variable_mag_min":11.526,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1977A&AS...30..261A, quality C)","proper_motion_ra_mas_yr":3.57,"proper_motion_dec_mas_yr":-1.18},"designations":[{"catalog":"HIP","designation":"HIP 4768"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}