45P/Honda–Mrkos–Pajdušáková
45P/Honda–Mrkos–Pajdušáková is a short-period comet discovered by Minoru Honda December 3, 1948. It is named after Minoru Honda, Antonín Mrkos, and Ľudmila Pajdušáková. The object revolves around the Sun on an elliptical orbit with a period of 5.25 years. The nucleus is 1.3 kilometers in diameter. On August 19 and 20, 2011, it became the fifteenth comet detected by ground radar telescope. During the 1995 perihelion passage, the comet was visible to Solar and Heliospheric Observatory (SOHO) on January 16, 1996, when the comet was around apparent magnitude 7 and 4.3°  from the Sun. It is green because it emits diatomic carbon which glows green in the near vacuum of space. 2011 passage. During the 2011 perihelion passage, the comet was recovered on 5 June at magnitude 21. On 8 July, the comet had a magnitude of approximately 18, and, as of 22 July, nuclear condensation was noticed around magnitude 16. It was expected to reach a peak magnitude of around 7.3 in late September near perihelion. On August 15, 2011, the comet made a close approach of only from the Earth and it was studied by the Goldstone Deep Space  Network. Radar observations on August 19 and 20 detected echoes from the nucleus and coma. 2017 passage. 45P/Honda–Mrkos–Pajdušáková came to perihelion on December 31, 2016. By February 4, 2017, it was around magnitude 7 and the coma was about 100,000 km across. The comet required binoculars to be seen because of the low surface brightness. The comet passed from Earth on February 11, 2017, which was the same day as a lunar eclipse. The next notable close approach will be in October 2032 when the comet might brighten to magnitude 7.