{"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":"2026-09-01T23:42:39.748Z","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-206151","name":"HD 206151 A","class":"f5v_yellow_white_main_sequence_star","category":"star","object_type":"F5V yellow-white main-sequence star","mag":8.85,"mag_band":"V","abs_mag":2.392,"abs_mag_band":"V","distance_ly":638.2707449036479,"distance_method":"parallax","ra_deg":325.38213,"dec_deg":-48.128727,"epoch_ra_deg":325.822403,"epoch_dec_deg":-48.00684,"epoch_moved_arcsec":0.618,"pm_ra_mas_yr":13.75,"pm_dec_mas_yr":-18.65,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Grus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-206151","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21415-4808","companions":[{"measured":2016,"magnitude":11.94,"components":null,"discoverer_code":"HDS3088","separation_arcsec":12.7,"position_angle_deg":111}],"spectral_type":"F5V","color_index_bv":0.489,"luminosity_solar":9.620552191862146,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","proper_motion_ra_mas_yr":13.75,"proper_motion_dec_mas_yr":-18.65},"designations":[{"catalog":"HD","designation":"HD 206151"},{"catalog":"HIP","designation":"HIP 107092"}],"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."}