{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T02:48:15.505Z","years_from_j2000":26.685,"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-107228","name":"HD 107228","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":9.06,"mag_band":"V","abs_mag":3.745,"abs_mag_band":"V","distance_ly":377.05927743061784,"distance_method":"parallax","ra_deg":184.91846999999999,"dec_deg":5.545085,"epoch_ra_deg":185.261621,"epoch_dec_deg":5.395311,"epoch_moved_arcsec":2.065,"pm_ra_mas_yr":-10.68,"pm_dec_mas_yr":-76.66,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-107228","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12197+0533","companions":[{"measured":2020,"magnitude":11.94,"components":"AB","discoverer_code":"A  1597","separation_arcsec":0.7,"position_angle_deg":291},{"measured":2020,"magnitude":13.1,"components":"AC","discoverer_code":"A  1597","separation_arcsec":1.4,"position_angle_deg":284}],"spectral_type":"G5","color_index_bv":0.539,"luminosity_solar":2.7669416454115106,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_temperature_k":5894,"proper_motion_ra_mas_yr":-10.68,"proper_motion_dec_mas_yr":-76.66,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 107228"},{"catalog":"HIP","designation":"HIP 60112"}],"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."}