[AZ-Observing] Re: Poor Quadrantids showing

  • From: Tom Polakis <tpolakis@xxxxxxx>
  • To: az-observing@xxxxxxxxxxxxx
  • Date: Wed, 4 Jan 2012 16:40:12 -0500


The International Meteor Organization's  'quicklook' data plot shows the peak 
occurring roughly on schedule at around midnight our time.


While the Quadrantids do have a sharp peak, the rate is still typically hanging 
on at half of the maximum four hours later, when you were looking.  The problem 
with your observed low total may have been that the radiant's altitude was 
still pretty low.  Multiplying the zenith rate by the sine of the radiant's 
altitude to get your rate.  Then after you factor in your limiting magnitude 
and obstructions, you're quickly down to a dozen per hour or so.

Your total Quadrantid count of three is three higher than mine.  I have never 
seen good circumstances for Arizona to warrant to trip out of the city.  It's a 
very narrow window.  We want them to peak at 6 a.m. MST, when Bootes is high 
and before twilight, but I can't remember that ever happening.


---- stevecoe@xxxxxxxxxxxxxxxx wrote: 

> I stayed outside for 30 minutes as the gibbous Moon set.  I saw exactly
> three meteors all from the radiant to the north of Bootes and south of the
> Head of Draco.  Two meteors were about 10 degrees long and 3rd magnitude
> and one was 15 degrees long and first magnitude.  Not much of a shower by
> my standards.
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