New status of the ISON project and results of space debris optical monitoring

International Scientific Optical Network (ISON) is an open international voluntary project specializing in observations of the near-Earth space objects. Started in Pulkovo observatory in 2004, ISON project then continued in Keldysh Institute of Applied Mathematics, and is currently under dedicated company Small Innovation Enterprise "ISON Ballistics-Service". At the peak of the project's development, it included almost 100 telescopes, but then part of the observatories associated with Roscosmos and the Vimpel Corporation was separated. Nevertheless observatories collaborating with ISON still provide the global coverage. Currently the network includes more than 50 telescopes of 27 observatories in 16 countries. ISON monitors the whole GEO region and tracks the objects at GEO, HEO and MEO. ISON data allows the maintenance of the database of the space objects orbits, validating the space debris population model and providing the conjunction assessment analysis for GEO satellites. In end of 2021 ISON orbital database included 7829 space objects (2537 GEO, 4753 HEO and 539 MEO), from that 1377 are objects with high are to mass ratio (516 GEO, 770 HEO and 91 MEO). ISON carries out the scientific and commercial activities including under contracts with foreign organizations and support the exchange of measurements with interested institutions. The development of new high-performance measuring instruments (twin 29-cm telescopes with FOV 7x14 degrees) is underway to improve the accuracy of the orbits in catalogue. Each such telescope can obtain up to 40000 measurements in 5000 tracklets for 1000 space objects per night.