{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:21:16.837Z","years_from_j2000":26.682,"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-152623","name":"HD 152623","class":"o7v_n_f_z_blue_main_sequence_star","category":"star","object_type":"O7V(n)((f))z blue main-sequence star","mag":6.7,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":254.06262,"dec_deg":-40.659941,"epoch_ra_deg":254.530117,"epoch_dec_deg":-40.702658,"epoch_moved_arcsec":0.09,"pm_ra_mas_yr":1.99,"pm_dec_mas_yr":-2.71,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-152623","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16563-4040","companions":[{"measured":2015,"magnitude":8.29,"components":"AB","discoverer_code":"HDS2394","separation_arcsec":0.2,"position_angle_deg":312},{"measured":2015,"magnitude":9.89,"components":"AC","discoverer_code":"SNA  60","separation_arcsec":1.5,"position_angle_deg":143},{"measured":2015,"magnitude":12.3,"components":"AD","discoverer_code":"VSP  66","separation_arcsec":4,"position_angle_deg":105}],"spectral_type":"O7V(n)((f))z","color_index_bv":0.045,"radial_velocity_km_s":-7,"spectral_type_source":"SIMBAD (2014ApJS..211...10S, quality C)","proper_motion_ra_mas_yr":1.99,"proper_motion_dec_mas_yr":-2.71},"designations":[{"catalog":"HD","designation":"HD 152623"},{"catalog":"HIP","designation":"HIP 82876"}],"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."}