{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T21:45:07.042Z","years_from_j2000":26.671,"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-37018","name":"42 Ori","class":"b1v_blue_white_main_sequence_star","category":"star","object_type":"B1V+? blue-white main-sequence star","mag":4.58,"mag_band":"V","abs_mag":-2.585,"abs_mag_band":"V","distance_ly":883.8925898345731,"distance_method":"parallax","ra_deg":83.84652,"dec_deg":-4.838358,"epoch_ra_deg":84.178037,"epoch_dec_deg":-4.820529,"epoch_moved_arcsec":0.222,"pm_ra_mas_yr":4.29,"pm_dec_mas_yr":-7.15,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-37018","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05354-0450","companions":[{"measured":2024,"magnitude":6.3,"components":"Aa,Ab","discoverer_code":"TOK 430","separation_arcsec":0.2,"position_angle_deg":44},{"measured":2024,"magnitude":7.5,"components":"AB","discoverer_code":"DA    4","separation_arcsec":1.2,"position_angle_deg":201}],"spectral_type":"B1V+?","color_index_bv":-0.183,"luminosity_solar":941.8895965228418,"radial_velocity_km_s":30,"spectral_type_source":"SIMBAD (2020A&A...639A..81B, quality C)","surface_temperature_k":27700,"proper_motion_ra_mas_yr":4.29,"proper_motion_dec_mas_yr":-7.15,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"42 Ori"},{"catalog":"HD","designation":"HD 37018"},{"catalog":"HIP","designation":"HIP 26237"},{"catalog":"HR","designation":"HR 1892"}],"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."}