{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.813","julian_year":2026.813,"time":"2026-10-25T02:25:33.773Z","years_from_j2000":26.813,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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-37041","name":"43 θ² Ori","class":"o9_5ivp_blue_subgiant","category":"star","object_type":"O9.5IVp blue subgiant","mag":4.98,"mag_band":"V","abs_mag":-3.399,"abs_mag_band":"V","distance_ly":1545.76466254256,"distance_method":"parallax","ra_deg":83.84542499999999,"dec_deg":-5.41606,"epoch_ra_deg":84.176864,"epoch_dec_deg":-5.398195,"epoch_moved_arcsec":0.06,"pm_ra_mas_yr":1.68,"pm_dec_mas_yr":1.5,"position_epoch_jyear":null,"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-37041","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05354-0525","companions":[{"measured":2023,"magnitude":8.31,"components":"Aa,Ab","discoverer_code":"CHR 249","separation_arcsec":0.4,"position_angle_deg":298},{"measured":2019,"magnitude":6.19,"components":"AB","discoverer_code":"STFA 16","separation_arcsec":52.3,"position_angle_deg":93},{"measured":2019,"magnitude":8.46,"components":"AC","discoverer_code":"STFA 16","separation_arcsec":128.5,"position_angle_deg":98},{"measured":2018,"magnitude":5.06,"components":"AD","discoverer_code":"STFA 17","separation_arcsec":134.4,"position_angle_deg":315}],"spectral_type":"O9.5IVp","color_index_bv":-0.097,"luminosity_solar":1993.4254564980927,"radial_velocity_km_s":36,"spectral_type_source":"SIMBAD (2011ApJS..193...24S, quality C)","proper_motion_ra_mas_yr":1.68,"proper_motion_dec_mas_yr":1.5},"designations":[{"catalog":"Bayer/Flamsteed","designation":"43 Theta2 Ori"},{"catalog":"HD","designation":"HD 37041"},{"catalog":"HIP","designation":"HIP 26235"},{"catalog":"HR","designation":"HR 1897"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. 43 θ² Ori [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-37041","bibtex":"@misc{spacecatalog_hd-37041,\n  author       = {{SpaceCatalog}},\n  title        = {{43 θ² Ori}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-37041},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-37041","release":"DR1","doi":null},"references":[{"bibcode":"2011ApJS..193...24S","ads_url":"https://ui.adsabs.harvard.edu/abs/2011ApJS..193...24S/abstract","quantity":"properties.spectral_type_source"}],"attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}