{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T20:10:52.851Z","years_from_j2000":26.665,"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-97584","name":"HD 97584","class":"k4v_orange_dwarf","category":"star","object_type":"K4V orange dwarf","mag":7.68,"mag_band":"V","abs_mag":6.851,"abs_mag_band":"V","distance_ly":47.76755845488337,"distance_method":"parallax","ra_deg":168.802065,"dec_deg":73.475206,"epoch_ra_deg":169.238714,"epoch_dec_deg":73.32976,"epoch_moved_arcsec":11.175,"pm_ra_mas_yr":-403.84,"pm_dec_mas_yr":112.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-97584","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11152+7329","age_years":10219852000,"companions":[{"measured":2021,"magnitude":11.34,"components":"AC","discoverer_code":"STT 539","separation_arcsec":6.5,"position_angle_deg":329},{"measured":2017,"magnitude":8.23,"components":"AB","discoverer_code":"STF1516","separation_arcsec":67.6,"position_angle_deg":103}],"mass_solar":0.74,"radius_solar":0.754,"spectral_type":"K4V","uncertainties":{"metallicity_fe_h":[0.035,0.035]},"color_index_bv":1.043,"luminosity_solar":0.15834341239145747,"metallicity_fe_h":-0.04,"radial_velocity_km_s":8.1,"spectral_type_source":"SIMBAD (2008ApJS..176..216A, quality C)","surface_gravity_log_g":4.535,"surface_temperature_k":4574,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-403.84,"proper_motion_dec_mas_yr":112.05,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2247},"designations":[{"catalog":"Gliese","designation":"Gl 420A"},{"catalog":"HD","designation":"HD 97584"},{"catalog":"HIP","designation":"HIP 54952"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}