Last
Updated 2018 Feb
Introduction:
I have been monitoring asteroidal occultations since 1979 when predictions were in their infancy. The first dissappearanec-reappearance (130) Elektra was recorded by video in 2010. At the time I was becoming more active with low-light video with help from Andrew Elliott (late Assistant Director of the BAA Asteroid and Remote Planets Section 1995-2010). Up till 2003 I was using a Philips security camera module (25fps) in a DIY box, sometimes with an image intensifier. When the camera malfunctioned I bought the integrating WAT 120N+ and a manual sync VTI from Maplin Electronics. The last visual observation was (172) Baucis in 2005, and I'm now exclusively a video observer using GPS as time source. This page summaries the positive events recorded since 2010. They represent about 10% of those monitored. From 2010 to 2018-June I have recorded 25 occultation chords.
Light
curves obtained using TANGRA
software by Hristo Pavlov
European results prepared by Eric Frappa: http://www.euraster.net/results/index.html
Bar Graph: The proportion in
green are the +ve events.
Planetary satellites are in yellow:
Titan/28Sgr in 1989 July, and Triton in 2017 Oct.
Diagrammatic
Instrument Setup for video recorded events. Mobile recording equipment
Table:
Colour code to exposure times::
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 |
Exposure |
Light
curve |
Chords |
Feb
20 |
 |
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 |
< Top >
5 Positive Events 2011:
Date |
Body |
Prediction |
Link to report |
Observed duration |
Maximum duration |
Magnitude Star / Astrd |
Magnitude |
Exposure |
Light
curve |
Chords |
Feb
15 |
 |
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 |
< Top >
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 |
 |
Report | 13.6
|
22.1
s
|
12.3
/ 11.6 |
0.5 |
0.16 |
 |
 |
|
| - | - | - | - | - | - | - | - | - | - | - |
Positive Events 2013 - NONE
< Top >
Date |
Body |
Prediction |
Link
to Report |
Observed
duration |
Maximum
duration |
Magnitude Star / Astrd |
Magnitude
drop |
Exposure | Light
curve |
Chords |
Jan
17 |
_Melete_track_Jan2014.jpg) |
1.2 |
10.2
s
|
12.0
/ 13.1 |
1.4 |
0.16 |
_Melete_lightcurve_Jan2014.jpg) |
 |
||
Apr
18 |
(386) Siegena |
 |
13.8 |
14.6
s |
12.6 /
13.0 |
(r) 0.9 |
0.16
|
 |
One
observer |
|
Apr |
(241) Germania |
|
Report | NEG |
8.5
s |
11.9
/
13.7 |
2.1 |
0.16 |
 |
 |
Sept |
(391)
Ingeborg |
|
- |
2.2 |
2.7
s |
12.4
/ 12.6 |
0.9 |
0.16 |
 |
Recorded by Adrian Jones |
< Top >
Date |
Body |
Prediction |
Link
to Report |
Observed |
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 |
|
|||
Dec
20 |
|
%20ReportJPG.JPG)
|
6.2 |
7.3s |
9.6
/ 13.5 |
3.9 |
0.04s |
Occult_track.JPG)
TANGRA_LC.JPG)
Chords_E_Frappa.JPG)
< Top >
4 Positive Events
2016:
Date |
Body |
Prediction |
Link
to Report |
Observed |
Maximum
duration |
Magnitude Star / Astrd |
Magnitude drop |
Exposure | Light
curve |
Notes |
| Feb 16 |
(423
) |
|
|
29.2 |
30 |
13.0
/11.9 |
0.5 |
0.16s |
|
8" LXD55 |
May
23 |
(583) Klotilde |
occult.JPG) |
report.JPG) |
1.8 |
7.2
|
9.0
/ 13.5 |
3.5 |
0.08s |
LC.JPG) OWstrip.JPG){kind=small}
|
Field.JPG) |
Aug
09 |
(107) Camilla |
Occult4.JPG) |
%20Report.JPG) |
18.9 |
22.9 |
14
/
12.8 |
0.4 |
0.08s
|
LC_start.JPG) |
Camilla_SMP.JPG) |
Oct
10 |
(268) Adorea |
_Occult.JPG) |
_Report.JPG) |
3.1 |
3.7 |
14
/
12.3 |
1.5 |
0.08s |
_LC.jpg) |
_Chords.JPG) |
< Top >
5 Positive Events 2017:
Date |
Body |
Prediction |
Link
to Report |
Observed |
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 |
 |
 |
142 |
160 |
12.7/13.5 |
1.4v |
0.64
|
 |
 |
|
Nov |
(18) Melpomene |
-Occult.JPG) |
%20Report_2017Nov.JPG) |
2.64 |
5 |
12
/ 12.8 |
0.7v |
0.04
|
_Melpomene_LC.jpg) |
Progress_200pc.jpg) |
Nov
28 |
(377) Campania |
|
|
8.4 |
9 |
12
/ 13 |
0.2v |
0.04
|
|
Frame.JPG) |
Occult.JPG)
Report_P1.JPG){kind=small}
Report_P2.JPG){kind=small}
%20LC.JPG)
Path_strip.JPG){kind=small}
< Top >
Positive Events 2018:
Date |
Body |
Prediction |
Link
to Report |
Observed
duration |
Maximum
duration |
Magnitude Star / Astrd |
Magnitude
drop |
Exposure | Light
curve |
Chords/Notes |
| April
21
|
(130)
Elektra |
_Occult.JPG) |
_report.JPG) |
16.4 |
20 |
11.6
/ 12.9 |
1.5 |
0.04 |
_LC_Short.jpg) |
_Chords.JPG) |
|
May
05 |
(74)Galatea |
|
Galatea_report.JPG) |
7.42 |
9.5 |
12.9/13.4 |
0.8
r |
0.08 |
Aota_lc.jpg) |
- |
| - | - | - | - | - | - | - | - | - | - | - |
_Occult.JPG)
_Melete_report_Jan2014.jpg){kind=link}
TANGRA_Field.JPG){kind=link}
