{"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":"2026-09-05T12:09:11.921Z","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-55354","name":"HD 55354","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":7.71,"mag_band":"V","abs_mag":2.964,"abs_mag_band":"V","distance_ly":290.1748061270323,"distance_method":"parallax","ra_deg":108.536475,"dec_deg":35.547572,"epoch_ra_deg":108.982448,"epoch_dec_deg":35.501783,"epoch_moved_arcsec":0.774,"pm_ra_mas_yr":22.66,"pm_dec_mas_yr":18.09,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Auriga","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-55354","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":10330314000,"mass_solar":1.04,"radius_solar":4.314,"spectral_type":"K0","color_index_bv":1.112,"luminosity_solar":5.680675741067723,"radial_velocity_km_s":-51.3,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.184,"surface_temperature_k":4751,"proper_motion_ra_mas_yr":22.66,"proper_motion_dec_mas_yr":18.09,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":7.4727},"designations":[{"catalog":"HD","designation":"HD 55354"},{"catalog":"HIP","designation":"HIP 34969"}],"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."}