Mostly +ve occultations, 2010 to present.


Last Updated 2017 September

I became more involved in the regular observation of Asteroid Occultations in 2009 although I had been observing periodically since about 1982. The late Andrew Elliott, then Assistant Director of the BAA Asteroid and Remote Planets Section, gave me much encouragement. As can be seen from the graph my observation numbers from 1982 up to this time was intermittent. In 2016 more events were monitored than in previous years. These have been from the IBEROC and UKOCL listings of low probability (<5%) events involving smaller asteroids of diameter 5-10Km. These predictions are displayed using the planning tool Occultwatcher by Hristo Pavlov. There are no visual observations now that integrating video is being used. The number of planned event that are clouded-out is estimated to be about 5x the number actually observed !

The last observation by eye was in 2005 (172) Baucis, but I was using 25fps video in 1989 for Titan/28Sgr occultation which can be seen in the graph as an isolated green mark. In Dec 2010 I took on the role left by Andrew's passing.


Light curves obtained using TANGRA software by Hristo Pavlov
European results prepared by Eric Frappa: http://www.euraster.net/results/index.html


Bar Graph: Observations 1982 to present. The proportion in green are the +ve events


Diagrammatic Instrument Setup for video recorded events. Mobile recording equipment
Colour code to exposure times in the table: BLUE = with a 30cm F4 reflector YELLOW = with a 20cm F4 reflector

Positive events 2010:

Date
Body
Prediction
Link to report
Observed
duration
Maximum
duration
Magnitude
Star / Astrd

Magnitude
drop

Exposure
Light curve
Chords
Feb 20
(130) Elektra
10.7
16.2 s
11.5 / 12.2
0.9
0.16
Mar 01
(532) Herculina
5.8
23.0 s
10.0 / 8.9
0.33
0.64
One observer
Jun 05
(80) Sappho
6.72
8.1 s
10.7 / 11.7
1.4
0.16
Oct 31
(213) Lilaea
7.1
5.9 s
10.8 / 12.8
2.2
0.64
One Observer

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Positive Events 2011:

Date
Body
Prediction
Link to report
Observed
duration
Maximum
duration
Magnitude
Star / Astrd

Magnitude
drop

Exposure
Light curve
Chords
Feb 15
(106) Dione
21.76
36.6
12.7 / 12.3
0.6
0.32
May 03
(42) ISIS
Report
1.76
4.6 s
11.5 / 13.3
2.0
0.16
Sep 14
(48) Doris
14.40
16.3 s
12.3 / 11.2
0.3
0.32
Nov 25
(83) Beartrix
3.84
8.1 s
13.0 / 12.2
0.4
0.16
Chords
Dec 18
(1796) Riga
3.44
8.6 s
11.9 / 16.0
4.1
0.16
Chords

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Positive Events 2012:

Date
Body
Prediction
Link to Report
Observed duration
Maximum duration
Magnitude
Star / Astrd
Magnitude drop
Exposure
Light curve
Chords
Feb 23
(41) Daphne
Report
13.6
22.1 s
12.3 / 11.6
0.5
0.16
- - - - - - - - - - -

Positive Events 2013 - NONE

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Positive Events 2014

Date
Body
Prediction
Link to Report
Observed duration
Maximum duration
Magnitude
Star / Astrd
Magnitude drop
Exposure
Light curve
Chords
Jan 17
(56)
Melete

Report

1.2
10.2 s
12.0 / 13.1
1.4
0.16
Apr 18
(386)
Siegena

Report

13.8
14.6 s
12.6 / 13.0
(r) 0.9
0.16
One observer

Apr
18

(241)
Germania


Report
NEG
8.5 s
11.9 / 13.7
2.1
0.16

Sept
02

(391)
Ingeborg
-
2.2
2.7 s
12.4 / 12.6
0.9
0.16
Recorded by Adrian Jones

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Positive Events 2015:

Date
Body
Prediction
Link to Report

Observed
duration

Maximum
duration
Magnitude
Star / Astrd
Magnitude
drop
Exposure
Light curve
Chords
Sept 30
(275) Sapientia
14.7
18s
7.9 / 13.0
5.0
0.08s

Analysis

Dec 20

6.2
7.3s
9.6 / 13.5
3.9
0.04s

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Positive Events 2016:

Date
Body
Prediction
Link to Report

Observed
duration

Maximum
duration
Magnitude
Star / Astrd
Magnitude
drop
Exposure
Light curve
Notes
Feb
16

(423 )
Diotima

29.2
30
13.0 /11.9
0.5
0.16s


8" LXD55
May 23
(583)
Klotilde
1.8
7.2
9.0 / 13.5
3.5
0.08s

Aug 09
(107)
Camilla
18.9
22.9
14 / 12.8
0.4

 

0.08s

 

Oct 10
(268)
Adorea
3.1
3.7
14 / 12.3
1.5

 

0.08s

 

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Positive Events 2017:

Date
Body
Prediction
Link to Report

Observed
duration

Maximum
duration
Magnitude
Star / Astrd
Magnitude
drop
Exposure
Light curve
Notes
Feb
07

(690) Wratislavia

8.4
14.7
12.8/13.1
0.7
0.32


Sep
24
(31) Euphrosyne
7.4
12.2
12.7/11.6
0.3
0.04
-
-
- -
-
-
-
-

 

-

 

-
-
-
-
- -
-
-
-
-

 

-

 

-
-

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Positive Events 2018: