{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T12:11:58.237Z","years_from_j2000":26.669,"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-110644","name":"HD 110644","class":"f3_5iv_yellow_white_subgiant","category":"star","object_type":"F3/5IV yellow-white subgiant","mag":8.67,"mag_band":"V","abs_mag":1.256,"abs_mag_band":"V","distance_ly":991.3568762593296,"distance_method":"parallax","ra_deg":190.904265,"dec_deg":2.163364,"epoch_ra_deg":191.247186,"epoch_dec_deg":2.016172,"epoch_moved_arcsec":0.498,"pm_ra_mas_yr":-16.87,"pm_dec_mas_yr":-8,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-110644","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12436+0210","age_years":1904224400,"companions":[{"measured":2016,"magnitude":12.3,"components":null,"discoverer_code":"A  2488","separation_arcsec":4.6,"position_angle_deg":191}],"mass_solar":1.634,"radius_solar":2.84,"spectral_type":"F3/5IV","color_index_bv":0.7,"luminosity_solar":27.390502512868633,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":3.714,"surface_temperature_k":6345,"proper_motion_ra_mas_yr":-16.87,"proper_motion_dec_mas_yr":-8,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":10.5204},"designations":[{"catalog":"HD","designation":"HD 110644"},{"catalog":"HIP","designation":"HIP 62100"}],"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."}