{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:34:11.424Z","years_from_j2000":26.684,"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-191862","name":"2 ξ² Cap","class":"f7vfe_0_5_yellow_white_main_sequence_star","category":"star","object_type":"F7VFe-0.5 yellow-white main-sequence star","mag":5.84,"mag_band":"V","abs_mag":3.628,"abs_mag_band":"V","distance_ly":90.34792587855966,"distance_method":"parallax","ra_deg":303.10779,"dec_deg":-12.617497,"epoch_ra_deg":303.4817,"epoch_dec_deg":-12.538757,"epoch_moved_arcsec":7.337,"pm_ra_mas_yr":193.25,"pm_dec_mas_yr":-195.6,"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-191862","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20124-1237","age_years":3472466000,"companions":[{"measured":2014,"magnitude":12.75,"components":"AB","discoverer_code":"BUP 206","separation_arcsec":90.5,"position_angle_deg":272}],"mass_solar":1.234,"radius_solar":1.501,"spectral_type":"F7VFe-0.5","uncertainties":{"metallicity_fe_h":[0.057,0.057]},"color_index_bv":0.476,"luminosity_solar":3.0817684166115114,"metallicity_fe_h":-0.19,"radial_velocity_km_s":22.6,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.151,"surface_temperature_k":6249,"metallicity_fe_h_source":"Median of 3 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":193.25,"proper_motion_dec_mas_yr":-195.6,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.0738},"designations":[{"catalog":"Bayer/Flamsteed","designation":"2 Xi2 Cap"},{"catalog":"Gliese","designation":"GJ 4139"},{"catalog":"HD","designation":"HD 191862"},{"catalog":"HIP","designation":"HIP 99572"},{"catalog":"HR","designation":"HR 7715"}],"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."}