Mostly +ve occultations, 2010 to present.


Last Updated 2017 September

I became a more active observer of Asteroid Occultations in 2009, although I had been observing them occasionally since 1981/2. Andrew Elliott (Assistant Director of the BAA Asteroid and Remote Planets Section 1990-2010) encouraged me with predictions and regular discussion. The observation graph below displays the number of observations from 1982 to present. 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 and at the same time converted entirely to video recordings.

In 2016/17 the first Gaia data release (DR1) was incorported by Dave Herald into the Occult4 software. Prediction uncertainties caused by poorly known star postions and propermotons were reduced to a large degree, incouraging mobile observations.

In 2016 more events were monitored than in previous years. These predictions are from the IBEROC and UKOCL listings of low probability (<5%). The UKOCL events are from John Talbot (Abingdon), and mostly smaller asteroids of diameter 5-10Km. These predictions are displayed using the planning tool Occult Watcher by Hristo Pavlov.

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

Observation Graph updated 2017 Nov 28


Bar Graph: Observations 1982 to present. The proportion in green are the +ve events.
Includes planetary moons: Titan/28Sgr in 1989 July, and Triton in 2017 Oct.


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

4 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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5 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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1 Positive Event 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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4 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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2 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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4 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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5 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
Oct 05
TRITON

UTube
142
160
12.7/13.5
1.4v

 

0.64

 

Nov
19

(18)
Melpomene
2.64
5
12/12.8
0.7v

 

0.04

 

Nov 28
(377)
Campania


8.4
9
12/14
0.2v

 

0.04

 


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-
-
-

 

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Positive Events 2018: