{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T20:44:30.312Z","years_from_j2000":26.654,"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-207496","name":"HD 207496","class":"k2_5vk_orange_dwarf","category":"star","object_type":"K2.5Vk: orange dwarf","mag":8.23,"mag_band":"V","abs_mag":6.045,"abs_mag_band":"V","distance_ly":89.21127090221681,"distance_method":"parallax","ra_deg":328.7118,"dec_deg":-77.337995,"epoch_ra_deg":329.41231,"epoch_dec_deg":-77.212373,"epoch_moved_arcsec":7.755,"pm_ra_mas_yr":223.7,"pm_dec_mas_yr":-186.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Octans","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-207496","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21549-7720","age_years":9647628000,"companions":[{"measured":1991,"magnitude":12.5,"components":"AB","discoverer_code":"HDS3117","separation_arcsec":2.1,"position_angle_deg":119},{"measured":2021,"magnitude":12.1,"components":"AC","discoverer_code":"SKF 106","separation_arcsec":7.6,"position_angle_deg":311}],"mass_solar":0.783,"radius_solar":0.819,"spectral_type":"K2.5Vk:","color_index_bv":1,"luminosity_solar":0.33265955329400443,"radial_velocity_km_s":-10.6,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.521,"surface_temperature_k":4741,"proper_motion_ra_mas_yr":223.7,"proper_motion_dec_mas_yr":-186.04,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.3057},"designations":[{"catalog":"Gliese","designation":"GJ 4229A"},{"catalog":"HD","designation":"HD 207496"},{"catalog":"HIP","designation":"HIP 108162"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}