{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T07:26:30.790Z","years_from_j2000":26.68,"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-159966","name":"27 Dra","class":"g9iiib_yellow_giant","category":"star","object_type":"G9IIIb yellow giant","mag":5.07,"mag_band":"V","abs_mag":1.016,"abs_mag_band":"V","distance_ly":210.96805595489886,"distance_method":"parallax","ra_deg":262.991175,"dec_deg":68.135024,"epoch_ra_deg":262.966082,"epoch_dec_deg":68.115452,"epoch_moved_arcsec":3.559,"pm_ra_mas_yr":-13.56,"pm_dec_mas_yr":132.7,"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-159966","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17320+6808","age_years":376739980,"companions":[{"measured":2020,"magnitude":11.4,"components":null,"discoverer_code":"BU 1458","separation_arcsec":154.9,"position_angle_deg":342}],"mass_solar":3.003,"radius_solar":11.046,"spectral_type":"G9IIIb","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":1.077,"luminosity_solar":34.16646128138224,"metallicity_fe_h":-0.14,"radial_velocity_km_s":-73,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.624,"surface_temperature_k":4838,"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":-13.56,"proper_motion_dec_mas_yr":132.7,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":54.1743},"designations":[{"catalog":"Bayer/Flamsteed","designation":"27 Dra"},{"catalog":"HD","designation":"HD 159966"},{"catalog":"HIP","designation":"HIP 85805"},{"catalog":"HR","designation":"HR 6566"}],"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."}