Back Зенитно часово число Bulgarian Taxa horària zenital Catalan Zenithal Hourly Rate German Tasa horaria zenital Spanish آهنگ ساعتی سرسویی FA Taux horaire zénithal French Taxa Horaria Zenital GL קצב זניתי לשעה HE Tasso orario zenitale Italian 天頂出現数 Japanese
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In astronomy, the zenithal hourly rate (ZHR) of a meteor shower is the number of meteors a single observer would see in an hour of peak activity if the radiant was at the zenith, assuming the seeing conditions are perfect[1] (when and where stars with apparent magnitudes up to 6.5 are visible to the naked eye[2]). The rate that can effectively be seen is nearly always lower and decreases the closer the radiant is to the horizon.
- ^ Cooke, Bill (19 Nov 2019). "About the Upcoming (maybe) Alpha Monocerotid Meteor Shower Outburst". NASA Blogs.
- ^ Beech, Martin (2006). Meteors and Meteorites: Origins and Observations. United Kingdom: Crowood Press. pp. 80–81. ISBN 9781861268259.