{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T09:18:04.367Z","years_from_j2000":26.675,"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-219623","name":"HD 219623","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":5.58,"mag_band":"V","abs_mag":4.021,"abs_mag_band":"V","distance_ly":66.87640831255194,"distance_method":"parallax","ra_deg":349.17607499999997,"dec_deg":53.213476,"epoch_ra_deg":349.481412,"epoch_dec_deg":53.358224,"epoch_moved_arcsec":6.972,"pm_ra_mas_yr":111.7,"pm_dec_mas_yr":-236.29,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-219623","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23167+5313","age_years":5006325200,"companions":[{"measured":2014,"magnitude":13.41,"components":null,"discoverer_code":"BUP 235","separation_arcsec":150.4,"position_angle_deg":322}],"mass_solar":1.117,"radius_solar":1.307,"spectral_type":"F8V","uncertainties":{"metallicity_fe_h":[0.057,0.057]},"color_index_bv":0.556,"luminosity_solar":2.1458531598843704,"metallicity_fe_h":0.02,"radial_velocity_km_s":-25.3,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":4.189,"surface_temperature_k":6050,"metallicity_fe_h_source":"Median of 11 spectroscopic determinations in 13 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":111.7,"proper_motion_dec_mas_yr":-236.29,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":2.0606},"designations":[{"catalog":"Gliese","designation":"GJ 4324"},{"catalog":"HD","designation":"HD 219623"},{"catalog":"HIP","designation":"HIP 114924"},{"catalog":"HR","designation":"HR 8853"}],"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."}