{"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":"2026-09-05T17:04:00.129Z","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-89668","name":"HD 89668","class":"k3_4v_orange_dwarf","category":"star","object_type":"K3/4V orange dwarf","mag":9.41,"mag_band":"V","abs_mag":6.875,"abs_mag_band":"V","distance_ly":104.83970605326999,"distance_method":"parallax","ra_deg":155.18086499999998,"dec_deg":-1.469828,"epoch_ra_deg":155.518373,"epoch_dec_deg":-1.60605,"epoch_moved_arcsec":18.299,"pm_ra_mas_yr":-664.26,"pm_dec_mas_yr":-171.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sextans","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-89668","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"radius_solar":0.79,"spectral_type":"K3/4V","uncertainties":{"metallicity_fe_h":[0.012,0.012]},"color_index_bv":1.073,"luminosity_solar":0.15488166189124808,"metallicity_fe_h":-0.13,"radial_velocity_km_s":31,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.535,"surface_temperature_k":4502,"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":-664.26,"proper_motion_dec_mas_yr":-171.04,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2301},"designations":[{"catalog":"HD","designation":"HD 89668"},{"catalog":"HIP","designation":"HIP 50657"}],"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."}