{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T20:43:03.415Z","years_from_j2000":26.665,"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-37366","name":"HD 37366","class":"o9_5iv_blue_subgiant","category":"star","object_type":"O9.5IV blue subgiant","mag":7.63,"mag_band":"V","abs_mag":-1.817,"abs_mag_band":"V","distance_ly":2528.3440183647767,"distance_method":"parallax","ra_deg":84.85333499999999,"dec_deg":30.890768,"epoch_ra_deg":85.286288,"epoch_dec_deg":30.905899,"epoch_moved_arcsec":0.102,"pm_ra_mas_yr":-1.34,"pm_dec_mas_yr":-3.58,"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-37366","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05394+3053","companions":[{"measured":2008,"magnitude":11.2,"components":"Aa,Ab","discoverer_code":"HDS 754","separation_arcsec":0.6,"position_angle_deg":293},{"measured":2015,"magnitude":12,"components":"AB","discoverer_code":"MZA  18","separation_arcsec":11.6,"position_angle_deg":44}],"spectral_type":"O9.5IV","color_index_bv":0.057,"luminosity_solar":464.3014072818035,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (2011ApJS..193...24S, quality C)","proper_motion_ra_mas_yr":-1.34,"proper_motion_dec_mas_yr":-3.58},"designations":[{"catalog":"HD","designation":"HD 37366"},{"catalog":"HIP","designation":"HIP 26611"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}