{"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":"2026-09-02T18:08:25.502Z","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-28226","name":"HD 28226","class":"am_white_star","category":"star","object_type":"Am white star","mag":5.72,"mag_band":"V","abs_mag":2.354,"abs_mag_band":"V","distance_ly":153.7024976245262,"distance_method":"parallax","ra_deg":67.003245,"dec_deg":21.619907,"epoch_ra_deg":67.402395,"epoch_dec_deg":21.679646,"epoch_moved_arcsec":2.849,"pm_ra_mas_yr":98.82,"pm_dec_mas_yr":-40.59,"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-28226","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04280+2137","age_years":1192039100,"companions":[{"measured":2014,"magnitude":11.38,"components":null,"discoverer_code":"BUP  60","separation_arcsec":167.7,"position_angle_deg":237}],"mass_solar":1.661,"radius_solar":2.023,"spectral_type":"Am","uncertainties":{"metallicity_fe_h":[0.21,0.21]},"color_index_bv":0.27,"luminosity_solar":9.963226419544174,"metallicity_fe_h":0.31,"radial_velocity_km_s":36,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.971,"surface_temperature_k":7313,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":98.82,"proper_motion_dec_mas_yr":-40.59,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":10.1221},"designations":[{"catalog":"HD","designation":"HD 28226"},{"catalog":"HIP","designation":"HIP 20842"},{"catalog":"HR","designation":"HR 1403"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}