2015 Perseids prediction 2015 Perseids prediction Active: July 17 - August 24. Maximum: August 13, 06h 30m to 09h 00m UT - IMO. August 12, 18h 39m UT - Jeremie Vaubaillon. Parent comet: 109P/Swift-Tuttle (orbit period: 130 year). ZHR(Zenithal Hourly Rate): 100. Radiant: α=48 deg, δ= +58 deg. Speed(V): 59 km/s. cf. ZHR(Zenithal Hourly Rate): the number of meteors a single observer would see in an hour of peak activity. 2015. 8. 12. 이전 1 다음