{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T10:14:03.154Z","years_from_j2000":26.672,"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-12340","name":"HD 12340","class":"b9iii_blue_white_giant","category":"star","object_type":"B9III blue-white giant","mag":9.35,"mag_band":"V","abs_mag":3.615,"abs_mag_band":"V","distance_ly":457.4424736571755,"distance_method":"parallax","ra_deg":30.75579,"dec_deg":61.065155,"epoch_ra_deg":31.235836,"epoch_dec_deg":61.194459,"epoch_moved_arcsec":0.124,"pm_ra_mas_yr":-3.66,"pm_dec_mas_yr":-2.87,"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/hd-12340","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"B9III","color_index_bv":0.244,"luminosity_solar":3.1188895840939352,"variable_mag_max":9.306,"variable_mag_min":9.406,"radial_velocity_km_s":-15,"spectral_type_source":"SIMBAD (quality C)","proper_motion_ra_mas_yr":-3.66,"proper_motion_dec_mas_yr":-2.87},"designations":[{"catalog":"HD","designation":"HD 12340"},{"catalog":"HIP","designation":"HIP 9575"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}