{"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":"2026-08-27T19:36:47.277Z","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":"hd-68456","name":"HD 68456","class":"f6vfe_0_8ch_0_4_yellow_white_main_sequence_star","category":"star","object_type":"F6VFe-0.8CH-0.4 yellow-white main-sequence star","mag":4.74,"mag_band":"V","abs_mag":3.237,"abs_mag_band":"V","distance_ly":65.16604426780533,"distance_method":"parallax","ra_deg":122.253195,"dec_deg":-61.302429,"epoch_ra_deg":122.361358,"epoch_dec_deg":-61.382548,"epoch_moved_arcsec":8.946,"pm_ra_mas_yr":-155.04,"pm_dec_mas_yr":-297.69,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-68456","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"F6VFe-0.8CH-0.4","uncertainties":{"metallicity_fe_h":[0.053,0.053]},"color_index_bv":0.437,"luminosity_solar":4.417738448896477,"metallicity_fe_h":-0.275,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.14,"surface_temperature_k":6524,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-155.04,"proper_motion_dec_mas_yr":-297.69,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 297.1"},{"catalog":"HD","designation":"HD 68456"},{"catalog":"HIP","designation":"HIP 39903"},{"catalog":"HR","designation":"HR 3220"}],"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."}