Early long-period comets: their discovery and flux

Details Early long-period comets: their discovery and flux Early long-period comets: their discovery and flux

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.339.1103h&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 4, pp. 1103-1110.

Astronomy and Astrophysics

Astronomy

2

Comets: General

Scientific paper

By analysing recent comet catalogues, it is found that the flux of long-period comets to the inner solar system has been reasonably constant throughout the last two millennia. There is no evidence of periods of enhanced activity, or comet showers. The acuity of northern hemisphere naked-eye observers throughout the era of pre-telescopic astronomy was such that they were capable of observing 0.903 +/- 0.088 long-period comets per year. This rate was not achieved in practice, but the combined efforts of Chinese, Japanese, Korean, Middle Eastern, European and North African observers got fairly close between AD 1355 and AD 1600 with a discovery rate of about 0.75 yr-1. The mean apparent magnitude of these historic long-period comets at discovery is estimated to be about 1.98 +/- 0.17, bright enough to change the form of a well-known constellation.

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