{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:22:39.277Z","years_from_j2000":26.679,"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-207966","name":"HD 207966","class":"g8_m1_yellow_star","category":"star","object_type":"G8+M1 yellow star","mag":7.85,"mag_band":"V","abs_mag":5.513,"abs_mag_band":"V","distance_ly":95.67503799580723,"distance_method":"parallax","ra_deg":327.970695,"dec_deg":42.343879,"epoch_ra_deg":328.239173,"epoch_dec_deg":42.467368,"epoch_moved_arcsec":9.397,"pm_ra_mas_yr":-175.22,"pm_dec_mas_yr":-305.57,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-207966","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21519+4221","age_years":12614321000,"companions":[{"measured":2016,"magnitude":11.26,"components":"AB","discoverer_code":"HO  172","separation_arcsec":10.7,"position_angle_deg":82},{"measured":2015,"magnitude":14.96,"components":"AE","discoverer_code":"FYM 113","separation_arcsec":64.4,"position_angle_deg":20},{"measured":2013,"magnitude":13.31,"components":"AC","discoverer_code":"HO  172","separation_arcsec":89.7,"position_angle_deg":40},{"measured":2003,"magnitude":8.63,"components":"AD","discoverer_code":"HO  172","separation_arcsec":480.9,"position_angle_deg":61}],"mass_solar":0.845,"radius_solar":0.893,"spectral_type":"G8+M1","uncertainties":{"metallicity_fe_h":[0.02,0.02]},"color_index_bv":0.798,"luminosity_solar":0.5430002130657378,"metallicity_fe_h":-0.05,"radial_velocity_km_s":-25.6,"spectral_type_source":"SIMBAD (1985ApJS...59..197B, quality D)","surface_gravity_log_g":4.459,"surface_temperature_k":5333,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-175.22,"proper_motion_dec_mas_yr":-305.57,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.5859},"designations":[{"catalog":"Gliese","designation":"Gl 838.3A"},{"catalog":"HD","designation":"HD 207966"},{"catalog":"HIP","designation":"HIP 107920"}],"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."}