{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T12:29:38.758Z","years_from_j2000":26.678,"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-156826","name":"HD 156826","class":"k0v_orange_dwarf","category":"star","object_type":"K0V orange dwarf","mag":6.31,"mag_band":"V","abs_mag":2.829,"abs_mag_band":"V","distance_ly":162.02502991472434,"distance_method":"parallax","ra_deg":259.998135,"dec_deg":-5.917509,"epoch_ra_deg":260.357898,"epoch_dec_deg":-5.946707,"epoch_moved_arcsec":5.305,"pm_ra_mas_yr":45.42,"pm_dec_mas_yr":-193.58,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-156826","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17200-0555","companions":[{"measured":2021,"magnitude":12.4,"components":"A,Ba","discoverer_code":"TOK 311","separation_arcsec":1.5,"position_angle_deg":246},{"measured":2016,"magnitude":14.89,"components":"AC","discoverer_code":"TOK 311","separation_arcsec":120.2,"position_angle_deg":350}],"spectral_type":"K0V","uncertainties":{"metallicity_fe_h":[0.056,0.056]},"color_index_bv":0.85,"luminosity_solar":6.4327992726085075,"metallicity_fe_h":-0.235,"radial_velocity_km_s":-33.1,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":3.6,"surface_temperature_k":5150,"metallicity_fe_h_source":"Median of 4 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":45.42,"proper_motion_dec_mas_yr":-193.58,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 668.1"},{"catalog":"HD","designation":"HD 156826"},{"catalog":"HIP","designation":"HIP 84801"},{"catalog":"HR","designation":"HR 6439"}],"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."}