{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T21:02:30.612Z","years_from_j2000":26.67,"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-28527","name":"HD 28527","class":"a6iv_white_subgiant","category":"star","object_type":"A6IV white subgiant","mag":4.78,"mag_band":"V","abs_mag":1.603,"abs_mag_band":"V","distance_ly":140.88813970041306,"distance_method":"parallax","ra_deg":67.64013,"dec_deg":16.194014,"epoch_ra_deg":68.02499,"epoch_dec_deg":16.252359,"epoch_moved_arcsec":2.879,"pm_ra_mas_yr":104.98,"pm_dec_mas_yr":-25.14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-28527","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04306+1612","companions":[{"measured":2014,"magnitude":6.54,"components":"AB","discoverer_code":"LDS2246","separation_arcsec":250.3,"position_angle_deg":131}],"spectral_type":"A6IV","uncertainties":{"metallicity_fe_h":[0.2,0.2]},"color_index_bv":0.17,"luminosity_solar":19.89756811090657,"metallicity_fe_h":0.3,"radial_velocity_km_s":41,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.98,"surface_temperature_k":8117,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":104.98,"proper_motion_dec_mas_yr":-25.14,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 170.1"},{"catalog":"HD","designation":"HD 28527"},{"catalog":"HIP","designation":"HIP 21029"},{"catalog":"HR","designation":"HR 1427"}],"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."}