namibia 2011 sda expedition - imo · sda-2008 roque de los muchachos, la palma 28°45´ n ;...
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Namibia 2011 SDA Expedition
Hakos Guestfarm
July 24 - August 8
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Notes: “broad” maximum ; sometimes “strong” radio activity
IMO Shower Calendar 2011 : Southern delta-Aquariids
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IMO Shower Calendar 2011 : Radiant drift of SDA
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Note: “outburst” peak or “regular” maximum?
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Note: location Netherlands (“Meteoracle” software by Daniel van Os)
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SDA-2006 from Taiba, Brazil & Puimichel, France (DMS)
SDA-2006 : Taiba, Brazil: 3°30´ S ; 38°53´ W ; Height: 5 meter From left to right are:
Carl Johannink, Rita Verhoef, Casper ter Kuile and Jaap Van ‘t Leven
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SDA-2006 from Taiba, Brazil & Provence, southern France (DMS)
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SDA-2006 : Milky-way at Taiba near Fortaleza, eastern coastal area of Brazil
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SDA-2008
Roque de los Muchachos,
La Palma
28°45´ N ; 17°53´ W
Height: 2300 meter
From left to right are:
Peter van Leuteren Klaas Jobse
Carl Johannink Koen Miskotte
Michel Vandeputte
In front of the Dutch Open Telescope
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DMS observations of SDA-2008 at La Palma
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DMS observations of SDA-2008 at La Palma
Domes and DMS observers at Roque de los Muchachos in twilight
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IMO observations sd-Aquariids 2009
Note: nearly all locations have (very) low Radiant elevation
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Locations of IMO observers for SDA-2009
Note: almost all observers of IMO are in the northern hemisphere...
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Notes: finding a suitable location for SDA > go south! Location Hakos, Namibia (“Meteoracle” software by Daniel van Os)
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Namibia compared to observing locations in S-America, Australia, Europe, US and Asia
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Note: Hakos – Namibia: clear skies ; very dry RH 10% ; temperatures 0° – 10° ; windy No artificial light at all, only starlight and the Milky-way
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Hakos Guestfarm: a perfect location for observing the southern nightsky
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Hakos Guestfarm: nice dinerroom with fantastic views on the mountains
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Hakos Guestfarm: specifically equipped for astronomical observations
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SDA , 24 july – 8 august 2011, Hakos Guestfarm, Namibia Latitude: 23°14'11" S, Longitude: 16°21'51" E, Height: 1818 meter
From left to right are: Peter van Leuteren, Inneke Vanderkerken, Michel Vandeputte,
Carl Johannink, Casper ter Kuile, Klaas Jobse, Koen Miskotte
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DMS-observations of Southern delta-Aquariids (SDA)
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Comparing ZHR values of SDA in 2008 and 2011
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Comparing r-value of SDA in 2008 and 2011
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Comparing ZHR values of SDA in 2001, 2003, 2006, 2008 and 2011
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What do we learn from observations of the SDA’s in recent years?
• Maximum above ZHR = 25 (comparable to Orionids)
• Broad maximum, number of bright meteors from 27/28 onwards,
see “r”-value also
• More observations before 27 july are welcomed: is sharp increase
in activity as observed in 2008 & 2011 realistic?
• More observations from southerly locations are needed to prove
the SDA are variable or stable
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Note: Photo of a -7 Capricornid on 26 july 2011 by Peter van Leuteren
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Note: Photo of a double Capricornid on 30 july 2011 by Carl Johannink
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Note: Composite of 3 Cap’s, 3 SDA’s and 1 Pau on 28/29 and 29/30 july 2011 by Koen Miskotte
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Note: the Large Magellan Cloud on 5 august 2011 by Casper ter Kuile
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Draconids 2011: radiantheight over Europe on 8 october at 20 UTC
Full moon between 25° and 45° in SSE. Map prepared by Peter Bus (Netherlands)
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Draconids 2011: cloudcover over Europe in October [%]
Weather statistics for Europe (J. Anderson, University of Manitoba)
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Draconids 2011: remind going above the inversion layer
Geminids 2004, Kahler Asten, Germany
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This SDA-2011 presentation made possible with help of:
• Carl Johannink
• Koen Miskotte
• Michel Vandeputte
• Peter van Leuteren
Much more information on these websites:
• www.astrorocker.nl
• www.blikomhoog.nl
• www.wondersofnature.nl