{"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":"2026-09-04T05:26:55.901Z","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-36959","name":"HD 36959","class":"b1v_blue_white_main_sequence_star","category":"star","object_type":"B1V blue-white main-sequence star","mag":5.67,"mag_band":"V","abs_mag":-3.916,"abs_mag_band":"V","distance_ly":2695.5073158540504,"distance_method":"parallax","ra_deg":83.754195,"dec_deg":-6.00927,"epoch_ra_deg":84.082687,"epoch_dec_deg":-5.991155,"epoch_moved_arcsec":0.028,"pm_ra_mas_yr":1.02,"pm_dec_mas_yr":-0.27,"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-36959","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05350-0600","companions":[{"measured":2021,"magnitude":8.48,"components":"Ba,Bb","discoverer_code":"HDS 742","separation_arcsec":0.5,"position_angle_deg":111}],"spectral_type":"B1V","uncertainties":{"metallicity_fe_h":[0.217,0.217]},"color_index_bv":-0.228,"luminosity_solar":3209.223768048436,"metallicity_fe_h":-0.16,"radial_velocity_km_s":30,"spectral_type_source":"SIMBAD (2020A&A...639A..81B, quality C)","surface_gravity_log_g":4.3,"surface_temperature_k":25240,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":1.02,"proper_motion_dec_mas_yr":-0.27,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 36959"},{"catalog":"HIP","designation":"HIP 26197"},{"catalog":"HR","designation":"HR 1886"}],"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."}