2005 UQ513 occultation of 14th mag star, observations wanted

6 years 3 months ago #98558 by albertw
Via Terry Mosley:

3. OBSERVATION WANTED: Sep 15:
IMPORTANT: Dr Pedro Lacerda of the Astrophysics Dept at QUB has asked me if any IAA members (or others), would be able to help with an important observation on Sep 15, at about 20.12 UT (21.12 BST).
2005 UQ513 is an Edgeworth-Kuiper Belt Object that is predicted to pass in front of a 14th mag star, and so occult it. The magnitude of 2005 UQ513 is about 21, so in effect the star will disappear from any location along the actual occultation track, unless the star is an undetected double star: in that case if only one component is occulted, the other star may remain visible, depending on its brightness.
The predicted occultation track (which may be slightly in error) passes right over Ireland, and in fact Ireland and Scotland are the best placed countries in the world to observe this event!
Observing the duration of this event can give accurate information about the size and shape of the object. We need at least 10-second time sampling to get good ingress and egress times.
Ideally, if we could get someone in the Northern end of the island and someone else in the S end that would be even better because we'd get more chords sampling the shape of the EKBO.
The details of the predicted event are at fraserkbos.com/?q=2005UQ513-2013-09-15-20-16 .
I know that there are some amateurs (and professionals) in Ireland who have suitable equipment to attempt this observation, which could yield some very useful information not obtainable in any other way. Of course, even negative observations are valuable, as they constrain the maximum size of the object.
The star is at: RA: 00h 30m 11.89s; Dec: + 30deg 37' 23.801". (That's near Delta Andromedae)
If you would like to have a go, please report directly to Pedro at This email address is being protected from spambots. You need JavaScript enabled to view it., copy to me, so I know what's happening.

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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