{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T03:36:35.277Z","years_from_j2000":26.682,"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-208740","name":"HD 208740","class":"k0v_orange_dwarf","category":"star","object_type":"K0V orange dwarf","mag":9.57,"mag_band":"V","abs_mag":6.283,"abs_mag_band":"V","distance_ly":148.1855624954475,"distance_method":"parallax","ra_deg":329.98569,"dec_deg":-54.654872,"epoch_ra_deg":330.436561,"epoch_dec_deg":-54.526889,"epoch_moved_arcsec":2.862,"pm_ra_mas_yr":-54.83,"pm_dec_mas_yr":-92.17,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Indus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-208740","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21599-5439","companions":[{"measured":2016,"magnitude":13.8,"components":null,"discoverer_code":"UC 4624","separation_arcsec":23.9,"position_angle_deg":336}],"mass_solar":0.842,"radius_solar":0.741,"spectral_type":"K0V","uncertainties":{"metallicity_fe_h":[0.06,0.06]},"color_index_bv":0.711,"luminosity_solar":0.26717757271179443,"metallicity_fe_h":-0.75,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","surface_gravity_log_g":4.541,"surface_temperature_k":5030,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-54.83,"proper_motion_dec_mas_yr":-92.17,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.3139},"designations":[{"catalog":"HD","designation":"HD 208740"},{"catalog":"HIP","designation":"HIP 108598"}],"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."}