{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T13:41:15.852Z","years_from_j2000":26.672,"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-196310","name":"HD 196310","class":"f2iv_v_yellow_white_subgiant","category":"star","object_type":"F2IV/V yellow-white subgiant","mag":7.65,"mag_band":"V","abs_mag":2.855,"abs_mag_band":"V","distance_ly":296.77555889926373,"distance_method":"parallax","ra_deg":309.22944,"dec_deg":-12.737137,"epoch_ra_deg":309.599942,"epoch_dec_deg":-12.644234,"epoch_moved_arcsec":0.949,"pm_ra_mas_yr":14.83,"pm_dec_mas_yr":-32.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Capricornus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-196310","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20369-1244","age_years":1339322000,"companions":[{"measured":2017,"magnitude":9.22,"components":"AB","discoverer_code":"STF2699","separation_arcsec":9.2,"position_angle_deg":196},{"measured":2015,"magnitude":13.64,"components":"AC","discoverer_code":"STF2699","separation_arcsec":37.2,"position_angle_deg":169},{"measured":2015,"magnitude":14.27,"components":"AD","discoverer_code":"STF2699","separation_arcsec":57,"position_angle_deg":157}],"mass_solar":1.42,"radius_solar":1.546,"spectral_type":"F2IV/V","uncertainties":{"metallicity_fe_h":[0.14,0.14]},"color_index_bv":0.405,"luminosity_solar":6.280583588133179,"metallicity_fe_h":-0.05,"variable_mag_max":7.631,"variable_mag_min":7.741,"radial_velocity_km_s":-32,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","surface_gravity_log_g":4.127,"surface_temperature_k":6887,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":14.83,"proper_motion_dec_mas_yr":-32.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":4.8826},"designations":[{"catalog":"HD","designation":"HD 196310"},{"catalog":"HIP","designation":"HIP 101706"}],"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."}