{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T04:18:19.582Z","years_from_j2000":26.666,"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-5151","name":"HIP 5151","class":"a_white_star","category":"star","object_type":"A white star","mag":9.35,"mag_band":"V","abs_mag":1.903,"abs_mag_band":"V","distance_ly":1006.6555673125112,"distance_method":"parallax","ra_deg":16.48323,"dec_deg":65.894118,"epoch_ra_deg":16.91874,"epoch_dec_deg":66.037899,"epoch_moved_arcsec":0.322,"pm_ra_mas_yr":10.84,"pm_dec_mas_yr":-5.29,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-5151","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"A","color_index_bv":0.151,"luminosity_solar":15.093848966549519,"variable_mag_max":9.307,"variable_mag_min":9.407,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","proper_motion_ra_mas_yr":10.84,"proper_motion_dec_mas_yr":-5.29},"designations":[{"catalog":"HIP","designation":"HIP 5151"}],"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."}