{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.785","julian_year":2026.785,"time":"2026-10-14T17:28:48.142Z","years_from_j2000":26.785,"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-109511","name":"24 Com A","class":"k0ii_iii_orange_bright_giant","category":"star","object_type":"K0II-III orange bright giant","mag":5.03,"mag_band":"V","abs_mag":-0.671,"abs_mag_band":"V","distance_ly":450.49208124803175,"distance_method":"parallax","ra_deg":188.78233500000002,"dec_deg":18.377058,"epoch_ra_deg":189.120507,"epoch_dec_deg":18.228722,"epoch_moved_arcsec":0.636,"pm_ra_mas_yr":-4.58,"pm_dec_mas_yr":23.3,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-109511","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":"12351+1823","companions":[{"measured":2023,"magnitude":6.33,"components":"AB","discoverer_code":"STF1657","separation_arcsec":20.1,"position_angle_deg":271}],"spectral_type":"K0II-III","uncertainties":{"metallicity_fe_h":[0.255,0.255]},"color_index_bv":1.152,"luminosity_solar":161.5846120949001,"metallicity_fe_h":0.165,"variable_mag_max":4.897,"variable_mag_min":5.087,"radial_velocity_km_s":4,"spectral_type_source":"SIMBAD (1997JApA...18..161Y, quality C)","surface_gravity_log_g":2.5,"surface_temperature_k":6178,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-4.58,"proper_motion_dec_mas_yr":23.3,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 109511"},{"catalog":"HIP","designation":"HIP 61418"},{"catalog":"HR","designation":"HR 4792"}],"updated_at":"2026-10-01T09:42:28.932Z","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."}