{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.832","julian_year":2026.832,"time":"2026-10-31T19:07:49.266Z","years_from_j2000":26.832,"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-49575","name":"HD 49575","class":"b8v_blue_white_main_sequence_star","category":"star","object_type":"B8V blue-white main-sequence star","mag":8.56,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":101.994225,"dec_deg":-26.534954,"epoch_ra_deg":102.266431,"epoch_dec_deg":-26.564421,"epoch_moved_arcsec":0.156,"pm_ra_mas_yr":-2.03,"pm_dec_mas_yr":5.44,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-49575","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":"06480-2632","companions":[{"measured":2018,"magnitude":9.42,"components":null,"discoverer_code":"B   703","separation_arcsec":0.1,"position_angle_deg":40}],"spectral_type":"B8V","color_index_bv":-0.089,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","proper_motion_ra_mas_yr":-2.03,"proper_motion_dec_mas_yr":5.44},"designations":[{"catalog":"HD","designation":"HD 49575"},{"catalog":"HIP","designation":"HIP 32591"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 49575 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-49575","bibtex":"@misc{spacecatalog_hd-49575,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 49575}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-49575},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-49575","release":"DR1","doi":null},"references":[{"bibcode":"1982MSS...C03....0H","ads_url":"https://ui.adsabs.harvard.edu/abs/1982MSS...C03....0H/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."}