{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T02:42:21.310Z","years_from_j2000":26.677,"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-80003","name":"HIP 80003","class":"sdg2_yellow_subdwarf","category":"star","object_type":"sdG2 yellow subdwarf","mag":11.52,"mag_band":"V","abs_mag":6.078,"abs_mag_band":"V","distance_ly":399.7013793280919,"distance_method":"parallax","ra_deg":244.96524000000002,"dec_deg":22.638965,"epoch_ra_deg":245.25298,"epoch_dec_deg":22.570612,"epoch_moved_arcsec":12.083,"pm_ra_mas_yr":-40.27,"pm_dec_mas_yr":-451.15,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-80003","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16199+2238","companions":[{"measured":2018,"magnitude":null,"components":"Aa,Ab","discoverer_code":"LAW   4","separation_arcsec":0.2,"position_angle_deg":222},{"measured":2016,"magnitude":15.6,"components":"AC","discoverer_code":"OSO  68","separation_arcsec":7,"position_angle_deg":133},{"measured":2016,"magnitude":15.2,"components":"AB","discoverer_code":"OSO  68","separation_arcsec":23,"position_angle_deg":351}],"spectral_type":"sdG2","color_index_bv":0.723,"luminosity_solar":0.322700768751553,"variable_mag_max":11.375,"variable_mag_min":11.625,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1943ApJ....98..209P, quality C)","surface_temperature_k":5142,"proper_motion_ra_mas_yr":-40.27,"proper_motion_dec_mas_yr":-451.15,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HIP","designation":"HIP 80003"}],"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."}