{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:44:38.343Z","years_from_j2000":26.679,"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-161897","name":"HD 161897","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":7.6,"mag_band":"V","abs_mag":5.212,"abs_mag_band":"V","distance_ly":97.94476022833805,"distance_method":"parallax","ra_deg":265.2786,"dec_deg":72.420343,"epoch_ra_deg":265.150176,"epoch_dec_deg":72.407784,"epoch_moved_arcsec":8.57,"pm_ra_mas_yr":-121.86,"pm_dec_mas_yr":297.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-161897","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17411+7225","age_years":1831113600,"companions":[{"measured":2016,"magnitude":14.68,"components":null,"discoverer_code":"GIC 148","separation_arcsec":89.6,"position_angle_deg":28}],"mass_solar":0.978,"radius_solar":0.911,"spectral_type":"K0","uncertainties":{"metallicity_fe_h":[0.047,0.047]},"color_index_bv":0.72,"luminosity_solar":0.7164732823911085,"metallicity_fe_h":-0.015,"radial_velocity_km_s":-17,"spectral_type_source":"SIMBAD (2007AJ....133.2524W, quality D)","surface_gravity_log_g":4.428,"surface_temperature_k":5602,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-121.86,"proper_motion_dec_mas_yr":297.22,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.7117},"designations":[{"catalog":"HD","designation":"HD 161897"},{"catalog":"HIP","designation":"HIP 86540"}],"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."}