{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T06:55:31.935Z","years_from_j2000":26.674,"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-219657","name":"HD 219657","class":"g6v_yellow_main_sequence_star","category":"star","object_type":"G6V yellow main-sequence star","mag":7.88,"mag_band":"V","abs_mag":3.883,"abs_mag_band":"V","distance_ly":205.51765672687435,"distance_method":"parallax","ra_deg":349.406745,"dec_deg":-1.52174,"epoch_ra_deg":349.753503,"epoch_dec_deg":-1.37579,"epoch_moved_arcsec":7.36,"pm_ra_mas_yr":260.35,"pm_dec_mas_yr":-91.41,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-219657","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23176-0131","age_years":10010341000,"companions":[{"measured":2021,"magnitude":9.59,"components":"AB","discoverer_code":"BU   79","separation_arcsec":1.7,"position_angle_deg":7},{"measured":2015,"magnitude":15.6,"components":"AC","discoverer_code":"BU   79","separation_arcsec":15.3,"position_angle_deg":156}],"mass_solar":0.996,"radius_solar":1.365,"spectral_type":"G6V","uncertainties":{"metallicity_fe_h":[0.05,0.05]},"color_index_bv":0.676,"luminosity_solar":2.436688423459583,"metallicity_fe_h":-0.02,"radial_velocity_km_s":-47.3,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.106,"surface_temperature_k":5770,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":260.35,"proper_motion_dec_mas_yr":-91.41,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.7528},"designations":[{"catalog":"HD","designation":"HD 219657"},{"catalog":"HIP","designation":"HIP 115012"}],"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."}