{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:01:24.630Z","years_from_j2000":26.67,"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-35956","name":"HD 35956","class":"g0v_yellow_main_sequence_star","category":"star","object_type":"G0V yellow main-sequence star","mag":6.71,"mag_band":"V","abs_mag":4.461,"abs_mag_band":"V","distance_ly":91.87499003902946,"distance_method":"parallax","ra_deg":82.21512,"dec_deg":12.550823,"epoch_ra_deg":82.592705,"epoch_dec_deg":12.571245,"epoch_moved_arcsec":6.217,"pm_ra_mas_yr":81.49,"pm_dec_mas_yr":-218.4,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35956","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05289+1233","companions":[{"measured":2015,"magnitude":11.24,"components":"AB","discoverer_code":"TOK  94","separation_arcsec":5.4,"position_angle_deg":75},{"measured":2015,"magnitude":13.99,"components":"AC","discoverer_code":"TOK  94","separation_arcsec":12.3,"position_angle_deg":356},{"measured":2015,"magnitude":12.93,"components":"AD","discoverer_code":"TOK  94","separation_arcsec":17,"position_angle_deg":258},{"measured":2015,"magnitude":14.23,"components":"AE","discoverer_code":"LDS6186","separation_arcsec":99.4,"position_angle_deg":134}],"spectral_type":"G0V","uncertainties":{"metallicity_fe_h":[0.086,0.086]},"color_index_bv":0.582,"luminosity_solar":1.4308694127493387,"metallicity_fe_h":-0.11,"radial_velocity_km_s":8.6,"spectral_type_source":"SIMBAD (1970AJ.....75..507H, quality C)","surface_gravity_log_g":4.38,"surface_temperature_k":5946,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 5 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":81.49,"proper_motion_dec_mas_yr":-218.4,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"GJ 3347A"},{"catalog":"HD","designation":"HD 35956"},{"catalog":"HIP","designation":"HIP 25662"}],"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."}