670226Meteor3_p1

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                        THE ROYAL ASTRONOMICAL SOCIETY OF CANADA

                     STANDING COMMITTEE ON OBSERVATIONAL ACTIVITIES
                                                                       Bulletin No. 3

                                 METEOR SECTION

THE GREAT LEONID METEOR STORM OF 1966

The Leonids have done it again!  With practically all of Canada clouded out, and with
many observers in the United States giving up too early, this unpredictable shower struck
with the greatest intensity since 1833. In the western U.S., observers persevering after
3:00 a.m. Mountain Standard Time were rewarded with a display they never dared hope to
see. Meteors kept arriving at a faster and faster rate, until the incredible value of
40 PER SECOND was reached at 5:00 a,m., LS.T. Of course, this was only an estimate -
all recorders were in utter confusion before this occurred. Photographs taken in this
period are covered with Leonid trails - one exposure recorded 43 in as many seconds.
What a sight it must have beeni - read the accounts in "The Review of Popular Astronomy"
(Jan/Feb-67) and "Sky and Telescrope" (Jan-67) and see what we missed!

Mr. and Mrs. E.E. Bridgen, former stalwart observers in the Montreal Centre and now re-
siding in Victoria, appear to have been the only ones in Canada to see anything of this
meteor display, and they were badly hampered by clouds. Their report notes: "With 102
meteors in half an hour, there was little more than one observer - I was kept busy
recording".

METEOR SHOWERS OF LATE WINTER AND SPRING

This is not a particularly good season for meteor observers. The weather is usually cold
and/or cloudy and meteors few and far between. In fact, the strongest showers occur
during the daytime and are observed only by radar techniques. Unless you are willing to
accept an expensively high ratio of exposures per meteor, photography is not recommended
durina this period. However, brilliant fireballs are just as likely to happen now as at
other times. Of the night-time showers, only the two noted below have enough visual
mete ors to emerge noticeably from the background of "sporadics".

The LYRIDS (21-22 April) have a single observer hourly rate of 15. The diffuse radiant
is dose to Vega (a. Lyra), and culminates (reaches its highest point in the sky) at
4:00 a.m. local time. Although a weak shower now, it was formerly much stronger,
reaching a near-storm value in 1803. On the night of 21 April, 1922, the observed
rate per hour was a miserable in the United Kingdom, but a magnificent 96 in Greece.
Observing ccnditions will not be favourable this year - a full moon featuring a total
eclipse occurs 2 days after the maximum.

The k AQUARIDS (5-6 May) have a single observer hourly rate of 20. The radiant culminates
at 7:00 a.m. local time- not a shower for those who like to retire early! Observing
conditions will be favourable with the moon well past last quarter. This shower is
thought to be associated with Halley' s Comet, as is the Orionid shower of 21 October.
However, this cattaxy association is stifl in doubt as there are many uncertainties
about the orbital characteristics of both showers.

SUGGESTIONS ON SETTING UP A VISUAL OBSERVING STATION

As more dust, smoke and light reach the skies above our cities, the selection of a site
for a meteor observing station becomes difficult. It is necessary to accept less than
perfect sky conditions in return for the convenience of accessibility and electric power.
The site should be chosen and "checked out" both in daylight and at night before the
station is established.