{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T10:31:53.644Z","years_from_j2000":26.672,"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-40873","name":"HD 40873","class":"a7iii_white_giant","category":"star","object_type":"A7III white giant","mag":6.39,"mag_band":"V","abs_mag":0.739,"abs_mag_band":"V","distance_ly":440.1571641073213,"distance_method":"parallax","ra_deg":91.12128,"dec_deg":51.573395,"epoch_ra_deg":91.653791,"epoch_dec_deg":51.571754,"epoch_moved_arcsec":1.144,"pm_ra_mas_yr":2.3,"pm_dec_mas_yr":-42.82,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Auriga","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-40873","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06045+5134","companions":[{"measured":2022,"magnitude":9.26,"components":"A,BC","discoverer_code":"STT 128","separation_arcsec":39.4,"position_angle_deg":14}],"spectral_type":"A7III","color_index_bv":0.196,"luminosity_solar":44.09608164506378,"radial_velocity_km_s":20,"spectral_type_source":"SIMBAD (quality C)","proper_motion_ra_mas_yr":2.3,"proper_motion_dec_mas_yr":-42.82},"designations":[{"catalog":"HD","designation":"HD 40873"},{"catalog":"HIP","designation":"HIP 28765"},{"catalog":"HR","designation":"HR 2123"}],"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."}