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Born in 1971 in Moscow, Denisenko graduated from Moscow Institute of Physics and Technology (MIPT or Phystech) in 1993 with a Master of Science in Astrophysics and a Diploma: Spectral Properties of Gamma-Ray Bursts Observed by PHEBUS Instrument of the Granat observatory. In 1991, he joined the High Energy Astrophysics Department of the Russian Space Research Institute (IKI)] where he still works. He was a visiting observer at the TUBITAK National Observatory (TUG) between 2002 and 2007, the author of more than 25 scientific articles and the presenter of talks at five international conferences.
He has been an amateur astronomer since 1977, a member of the Moscow Astronomy Club since 2002 and the head of a working group on asteroidal occultations. He participated in Astrofests 2001–2006 and was a speaker at Astrofest 2005 and 2006. He is an active enthusiast of professional-amateur collaboration in astronomy and long-time contributor to IOTAoccultations, Planoccult, meteorobs, comets-ml, MPML, SeeSat, AAVSO-HEN, AAVSO-DIS, vsnet-alert, vsnet-outburst, cvnet-discussion mailing lists. He is the owner and moderator of five Russian astronomy mailing lists (komety, pokrytie, rusmeteors, moscow-astro, varstars) and author of a few popular articles in Zemlya i Vselennaya (Earth and Universe) magazine. He was mentioned in Sky and Telescope twice and gave interviews on Russian News Service, Radio Liberty, Gazeta newspaper, and the BBC Russian Service in 2007.
- Optical Afterglow Candidate of GRB 920925C (2007) – the "prehistoric" Gamma ray burst with the optical afterglow found on the Palomar plate.
- NSV 1485 Correct Identification and Period Determination (2007)
- V713 Cep Eclipses and Period Measurement (2007)
- Deep Eclipses in the Cataclysmic Variable 1RXS J020929.0+283243 (2005) – the binary system with 4.5m eclipse amplitude.
- Supernovae 2011hz and 2011ip
- Minor Planet 2005 UN1
- Variable stars discoveries
- NSV 1485 Outburst Discovery
- Occultation of 2UCAC 31525121 by (130) Elektra – positive! (2007)
- Correctly identified what was thought to be asteroid 2007 VN84 as the Rosetta probe
- Listed at Marquis Who's Who in Science and Engineering 10th Anniversary Edition 2008–2009
- "‘Deadly asteroid’ is a spaceprobe". Skymania. 10 November 2007. Retrieved 1 September 2010.
Literary works (in Russian)
- Hide away – Den is comin'! (1997) – book of ironic parodies on Russian ironist Andrey Knyshev.
- Was N.A. Morozov right, or Dating the Denderah Zodiacs (1992)