{"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":"2026-09-03T10:10:59.721Z","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-40724","name":"HD 40724","class":"b8ive_blue_white_subgiant","category":"star","object_type":"B8IVe blue-white subgiant","mag":6.36,"mag_band":"V","abs_mag":-0.55,"abs_mag_band":"V","distance_ly":785.9191278449958,"distance_method":"parallax","ra_deg":90.42345,"dec_deg":22.401001,"epoch_ra_deg":90.829072,"epoch_dec_deg":22.401535,"epoch_moved_arcsec":0.493,"pm_ra_mas_yr":-6.19,"pm_dec_mas_yr":-17.4,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-40724","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06017+2224","companions":[{"measured":1996,"magnitude":null,"components":null,"discoverer_code":"CHR 161","separation_arcsec":0.1,"position_angle_deg":178}],"spectral_type":"B8IVe","color_index_bv":-0.071,"luminosity_solar":144.54397707459265,"radial_velocity_km_s":24,"spectral_type_source":"SIMBAD (2018A&A...609A.108S, quality C)","surface_temperature_k":11677,"proper_motion_ra_mas_yr":-6.19,"proper_motion_dec_mas_yr":-17.4,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 40724"},{"catalog":"HIP","designation":"HIP 28561"},{"catalog":"HR","designation":"HR 2116"}],"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."}