{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T10:14:17.189Z","years_from_j2000":26.68,"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-154363","name":"HD 154363","class":"k4_5v_orange_dwarf","category":"star","object_type":"K4/5V orange dwarf","mag":7.7,"mag_band":"V","abs_mag":7.552,"abs_mag_band":"V","distance_ly":34.92025873662085,"distance_method":"parallax","ra_deg":256.264155,"dec_deg":-5.066508,"epoch_ra_deg":256.614447,"epoch_dec_deg":-5.112245,"epoch_moved_arcsec":38.988,"pm_ra_mas_yr":-916.86,"pm_dec_mas_yr":-1137.91,"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-154363","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17050-0504","age_years":13373318000,"companions":[{"measured":1960,"magnitude":11.2,"components":"AD","discoverer_code":"LDS 585","separation_arcsec":18.5,"position_angle_deg":142},{"measured":2016,"magnitude":10.14,"components":"AB","discoverer_code":"LDS 585","separation_arcsec":184.4,"position_angle_deg":123},{"measured":2016,"magnitude":11.44,"components":"AC","discoverer_code":"ABT  13","separation_arcsec":392.2,"position_angle_deg":72}],"mass_solar":0.671,"radius_solar":0.664,"spectral_type":"K4/5V","uncertainties":{"metallicity_fe_h":[0.109,0.109]},"color_index_bv":1.1,"luminosity_solar":0.0830233015924954,"metallicity_fe_h":-0.61,"radial_velocity_km_s":34.2,"spectral_type_source":"SIMBAD (1986AJ.....92..139S, quality C)","surface_gravity_log_g":4.639,"surface_temperature_k":4311,"metallicity_fe_h_source":"Median of 7 spectroscopic determinations in 13 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-916.86,"proper_motion_dec_mas_yr":-1137.91,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.1378},"designations":[{"catalog":"Gliese","designation":"Gl 653"},{"catalog":"HD","designation":"HD 154363"},{"catalog":"HIP","designation":"HIP 83591"}],"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."}