ETA AQUARIIDS 2011Thomas Weiland - Felix Bettonvil
IntroductionIntroduction
How to observe the Eta-Aquariids Observing campaign 2011g p g Results Future work Future work
Observing the Eta-AquariidsObserving the Eta Aquariids
Southern Hemisphere: major annual stream (ZHR 45-80)Diffi lt t b f id th l tit d
Radiant height
Difficult to observe from mid northern latitudes Go south!
40 00
60,00
80,00
0,00
20,00
40,00
0 0 0 0 0 0 0 0 0 0 0 0
Netherlands
La Palma
-40,00
-20,00 21:0
0
22:0
0
23:0
0
00:0
0
01:0
0
02:0
0
03:0
0
04:0
0
05:0
0
06:0
0
07:0
0
08:0
0 La Palma
End nautical twilight
-80,00
-60,00
End nautical twilight NL
gLP
La PalmaLa Palma
28.75˚ N High, volcanic, dark clear skiesg , , Astronomical observatory
2011 Observing campaign2011 Observing campaign
May 03/04 to 09/10 New Moon May 03, First Quarter May 10 y y Observers WEITH, BETFE Visual Visual 7 nights, 33 hrs effective observing time Lm 6.30-6.94 (before beginning of twilight) 354 ETAs (including twilight)( g g )
Results - StatisticsResults Statistics
Results - Magnitude distributionResults Magnitude distribution
M i d di ib i SPO
40
54
50
60
Magnitude distribution ETA68
60
70
80
Magnitude distribution SPO
1218 20
4035
1914
1713 13
30
23
20
30
40
BETFE
WEITH21
36
51 48
30
17 15
25
48
20
30
40
50
60
BETFE
WEITH
0 0 0 2 4
129
500 0 0 1
5
13 13
0
10
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
0 0 1 1 2 1
12 12
00 0 1 1 15
1117 15
0
10
20
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
Results - Population indexResults Population index
SPO ll i di id l d t
3
3,5
4
r - ETA all individual data
3
3,5
4
r - SPO all individual data
1
1,5
2
2,5
3
1
1,5
2
2,5
3
0
0,5
1
3,5 4,5 5,5 6,5 7,5 8,5 9,5 10,50
0,5
1
3,5 4,5 5,5 6,5 7,5 8,5 9,5 10,5
Bl BETFE R d WEITHBlue – BETFE; Red - WEITH
Results - ZHRResults ZHR
ZHR average all data per night
90,00
100,00
ZHR – average all data per night
50 00
60,00
70,00
80,00
90,00
20,00
30,00
40,00
50,00
0,00
10,00
3,5 4,5 5,5 6,5 7,5 8,5 9,5 10,5 11,5
Bl BETFE R d WEITHBlue – BETFE; Red – WEITH
Results – General AppearanceResults General Appearance
Trains: 28 % leave train (78% of bright, 15% of faint ETAs)
Colours mainly yellow and orange, few blue, white and green huesg
Earth grazers: 2 (May 06, May 07)
Results - PhotographyResults Photography
Statistics Photo that I captured with ETAp
Results - ComparisonResults Comparison
IMO live ZHR graph: Increase beyond 30 after May 03, followed by flat maximum (40-60) from May 06/07 onwards until May 10onwards until May 10.
Results - ConclusionResults Conclusion
r and ZHR comparable with previous returns (Cooper, 1996; Rendtel & Arlt, 2009)
Skew maximum. Not untypical. Maximum around May 06/07? Maximum around May 06/07?
Bigger particlesEarth grazersEarth grazers
Future workFuture work
Next time even more south? Namibia? 2019, 2021 and 2022 excellent choices (moon (
phase, Jupiter)