{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T10:01:48.225Z","years_from_j2000":26.677,"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-161270","name":"61 Oph","class":"a0iv_white_subgiant","category":"star","object_type":"A0IV white subgiant","mag":6.16,"mag_band":"V","abs_mag":1.518,"abs_mag_band":"V","distance_ly":276.63801182627657,"distance_method":"parallax","ra_deg":266.14206,"dec_deg":2.579441,"epoch_ra_deg":266.479561,"epoch_dec_deg":2.567637,"epoch_moved_arcsec":0.412,"pm_ra_mas_yr":7.21,"pm_dec_mas_yr":13.64,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-161270","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17446+0235","companions":[{"measured":2024,"magnitude":6.47,"components":"AB","discoverer_code":"STF2202","separation_arcsec":20.6,"position_angle_deg":93}],"spectral_type":"A0IV","color_index_bv":0.131,"luminosity_solar":21.517905703397542,"variable_mag_max":5.928,"variable_mag_min":6.348,"radial_velocity_km_s":-31,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_temperature_k":10257,"proper_motion_ra_mas_yr":7.21,"proper_motion_dec_mas_yr":13.64,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"61 Oph"},{"catalog":"HD","designation":"HD 161270"},{"catalog":"HIP","designation":"HIP 86831"},{"catalog":"HR","designation":"HR 6609"}],"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."}