{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T02:17:19.433Z","years_from_j2000":26.668,"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-94549","name":"HD 94549","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":7.22,"mag_band":"V","abs_mag":2.883,"abs_mag_band":"V","distance_ly":240.35115786702255,"distance_method":"parallax","ra_deg":164.05071,"dec_deg":64.538047,"epoch_ra_deg":164.482465,"epoch_dec_deg":64.395425,"epoch_moved_arcsec":3.507,"pm_ra_mas_yr":-101.52,"pm_dec_mas_yr":83.57,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-94549","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":4381616600,"mass_solar":1.309,"radius_solar":3.695,"spectral_type":"K0","color_index_bv":0.959,"luminosity_solar":6.120684588704599,"radial_velocity_km_s":19.4,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.412,"surface_temperature_k":4961,"proper_motion_ra_mas_yr":-101.52,"proper_motion_dec_mas_yr":83.57,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":7.4212},"designations":[{"catalog":"HD","designation":"HD 94549"},{"catalog":"HIP","designation":"HIP 53463"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}