{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.814","julian_year":2026.814,"time":"2026-10-25T10:50:23.073Z","years_from_j2000":26.814,"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-109556","name":"HD 109556","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":7.99,"mag_band":"V","abs_mag":2.191,"abs_mag_band":"V","distance_ly":471.32434140555563,"distance_method":"parallax","ra_deg":188.93196,"dec_deg":-12.024959,"epoch_ra_deg":189.28102,"epoch_dec_deg":-12.173424,"epoch_moved_arcsec":3.947,"pm_ra_mas_yr":-146.18,"pm_dec_mas_yr":17.36,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Corvus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-109556","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":"12357-1201","age_years":3191494500,"companions":[{"measured":2025,"magnitude":8.34,"components":"AB","discoverer_code":"STF1659","separation_arcsec":28.1,"position_angle_deg":351},{"measured":2018,"magnitude":10.89,"components":"AC","discoverer_code":"STF1659","separation_arcsec":43.8,"position_angle_deg":69},{"measured":2018,"magnitude":6.78,"components":"AE","discoverer_code":"STF1659","separation_arcsec":151.2,"position_angle_deg":275},{"measured":2018,"magnitude":9.88,"components":"AD","discoverer_code":"STF1659","separation_arcsec":189.8,"position_angle_deg":32},{"measured":2018,"magnitude":6.64,"components":"AF","discoverer_code":"STF1659","separation_arcsec":209.4,"position_angle_deg":139}],"mass_solar":1.301,"radius_solar":1.665,"spectral_type":"G0","color_index_bv":0.483,"luminosity_solar":11.577105741152703,"variable_mag_max":7.894,"variable_mag_min":8.014,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.979,"surface_temperature_k":6274,"proper_motion_ra_mas_yr":-146.18,"proper_motion_dec_mas_yr":17.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.8901},"designations":[{"catalog":"HD","designation":"HD 109556"},{"catalog":"HIP","designation":"HIP 61466"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 109556 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-109556","bibtex":"@misc{spacecatalog_hd-109556,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 109556}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-109556},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-109556","release":"DR1","doi":null},"references":[{"bibcode":"1993yCat.3135....0C","ads_url":"https://ui.adsabs.harvard.edu/abs/1993yCat.3135....0C/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."}