{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T03:53:05.322Z","years_from_j2000":26.674,"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-106887","name":"HD 106887","class":"ka3ha6mf1_white_star","category":"star","object_type":"kA3hA6mF1 white star","mag":5.71,"mag_band":"V","abs_mag":2.01,"abs_mag_band":"V","distance_ly":179.20694789284238,"distance_method":"parallax","ra_deg":184.37740499999998,"dec_deg":28.937189,"epoch_ra_deg":184.715933,"epoch_dec_deg":28.788235,"epoch_moved_arcsec":1.289,"pm_ra_mas_yr":-33.12,"pm_dec_mas_yr":35.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-106887","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12175+2856","companions":[{"measured":2016,"magnitude":11.2,"components":null,"discoverer_code":"STT 245","separation_arcsec":8.4,"position_angle_deg":282}],"spectral_type":"kA3hA6mF1","uncertainties":{"metallicity_fe_h":[0.15,0.15]},"color_index_bv":0.16,"luminosity_solar":13.677288255958487,"metallicity_fe_h":0.21,"radial_velocity_km_s":-7,"spectral_type_source":"SIMBAD (1995ApJS...99..135A, quality D)","surface_gravity_log_g":4.2,"surface_temperature_k":8291,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-33.12,"proper_motion_dec_mas_yr":35.2,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 106887"},{"catalog":"HIP","designation":"HIP 59923"},{"catalog":"HR","designation":"HR 4673"}],"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."}