Observations of the 1985 Giacobinids in Japan

doi:10.1016/0019-1035(90)90181-8

Icarus

Volume 88, Issue 1, November 1990, Pages 122-128

https://doi.org/10.1016/0019-1035(90)90181-8 Get rights and content

Abstract

The Giacobinid (Draconid) meteor shower showed a remarkable display with a maximum ZHR of several hundred meteors per hour on October 8, 1985. Visual observations suggest that the maximum occurred immediately before 10 hr UT. FM radio reflection rates suggest that either the main maximum was followed by a secondary maximum, or the time of maximum varied with the mass of the meteoroids. The Giacobinid shower was rich in faint meteors (r = 3.26 ± 0.40) and consisted of fragile particles. The 1985 apparition, therefore, did not differ from the previous ones in this respect. It occurred unexpectedly and preceded the predicted time by several hours. Our results differ from those of Nagasawa and Kawagoe (1987, Icarus 70, 138–145) but are consistent with other studies.

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Citation Excerpt :
An equivalent ZHR is estimated to be from around 400–500 (Lindblad, 1987; Simek, 1994) to possibly as high as 2200 (Mason, 1986). In agreement with the radio measurements, visual observations carried out in Japan in 1985 confirmed a ZHR higher than 500 shortly before 10h UT on October 8 (Koseki, 1990). The unexpected 2005 radio outburst was detected on October 8 around 16h05 UT (Campbell-Brown et al., 2006).
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Observations of the 1985 Giacobinids in Japan

Abstract

Icarus

The structure of the Giacobinid 1985 meteor shower from radar observations in Dushanbe and Ondřejov

Bull. Astron. Inst. Czech.

The Giacobinids, 1946

J. Brit. Astr. Assoc.

An analysis of the atmospheric trajectories of 413 precisely reduced photographic meteors

Smiths. Contr. Astrophys.

On the structure of the Giacobinid meteor shower

Bull. Astron. Inst. Czech.

The magnitude distribution of meteors in meteor streams

Contr. Astron. Obs. Skalnate Pleso

The 1985 return of the Giacobinid meteor stream

ESA SP-250/II

The 1985 return of the Giacobinid meteor stream

Astron. Astrophys.