Page
Updated 2023 June 14
HISTORY:
Read about this observers equipment evolution
from 1980-2020
Update:
From 2019-Nov-30, the instrument is a Celestron
11 working at about F6. Then from January 2020, I started using the
C11 on EQ8 with USB3 QHY174m-GPS
camera recording to W10 laptop.
About:
The start and end time of an occultation is found from the light curve
in column ten of the table. Timing is made to an accuray of 0.1 sec (typically),
or better if the observing conditions allow. To get the light curve, the
occultation is recorded by video with GPS time inserted on the frames,
which is then analysed with Tangra.
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.
Instrument Setup for video recorded events.
Table:
Colour code to exposure times:
Blue
= with a 300mm F4 reflector,
Yellow =
with a 203mm F4 Schmidt Newtonian, Green
= C11 SCT at F/6
dM = drop in magnitudes, from (Asteroid+Star) to Asteroid. From April
2020 the QHY174m-GPS "qhygps" is used in place of WAT910HX.
( bracketed ) = total chords year on year
4
(4)
Positive events 2010:
Date |
Body |
Prediction |
Link to report |
Observed
duration |
Maximum
duration |
Magnitude
Star /
Astrd |
Magnitude
drop dM |
Exposure |
Light
curve |
|
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 (9)
Positive Events 2011:
Date |
Body |
Prediction |
Link to report |
Observed
duration |
Maximum
duration |
Magnitude
Star /
Astrd |
Magnitude
drop |
Exposure |
Light
curve |
Chords |
Feb
15 |
|
|
|
21.76 |
36.6 |
12.7
/ 12.3 |
0.6 |
0.32 |
|
|
May
03 |
(42)
ISIS |
|
|
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 (10)
Positive Event 2012:
Date |
Body |
Prediction |
Link
to Report |
Observed
duration |
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop |
Exposure |
Light
curve |
Chords |
Feb
23 |
|
 |
|
13.6
|
22.1
s
|
12.3
/ 11.6 |
0.5 |
0.16 |
|
|
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
Positive
Events 2013 - NONE
< Top
>
3 (13)
Positive Events 2014
Date |
Body |
Prediction |
Link
to Report |
Observed
duration |
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop |
Exposure |
Light
curve |
Chords |
Jan
17 |
|
|
Report
|
1.2 |
10.2
s
|
12.0
/ 13.1 |
1.4 |
0.16 |
|
 |
Apr
18 |
(386)
Siegena |
|
Report |
13.8 |
14.6
s |
|
(r) 0.9 |
0.16
|
|
One
observer |
Apr
18 |
(241)
Germania
|


|
|
NEG |
8.5
s |
|
2.1 |
0.16 |
|
 |
|
(391)
Ingeborg |
|
- |
2.2 |
2.7
s |
|
0.9 |
0.16 |
|
Recorded by
Adrian Jones |
< Top
>
2 (15)
Positive Events 2015:
Date |
Body |
Prediction |
Link
to Report |
|
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 |
|
|
< Top
>
4 (19)
Positive Events 2016:
Date |
Body |
Prediction |
Link
to Report |
|
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 |
|
report.JPG) |
1.8 |
7.2
|
9.0
/ 13.5 |
3.5 |
0.08s |
|
|
Aug
09 |
(107)
Camilla |
|
%20Report.JPG) |
18.9 |
22.9 |
14
/
12.8 |
0.4 |
0.08s
|
|
|
Oct
10 |
(268)
Adorea |
|
_Report.JPG) |
3.1 |
3.7 |
14
/
12.3 |
1.5 |
0.08s
|
|
|
< Top
>
5 (24)
Positive Events 2017:
Date |
Body |
Prediction |
Link
to Report |
|
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 |
1.4 |
0.64
|
|
|
|
(18)
Melpomene |
|
|
2.64 |
5 |
12
/ 12.8 |
0.7 |
0.04
|
|
|
Nov
28 |
(377)
Campania |
Occult.JPG)
|
Report_P1.JPG)
Report_P2.JPG)
|
8.4 |
9 |
12
/ 13 |
0.2 |
0.04
|
%20LC.JPG)
Path_strip.JPG)
|
|
< Top
>
8 (32)
Positive Events 2018:
Date |
Body |
Prediction |
Link
to Report |
Observed
duration |
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop(r) |
Exposure |
Light
curve |
Chords/Notes |
April
21
|
(130)
Elektra
|
|
|
16.4 |
20 |
11.6
/ 12.9 |
1.5 |
0.04 |
|
|
May
05 |
(74)
Galatea |
_Occult.JPG)
|
|
7.42 |
9.5 |
12.9
/
13.4 |
0.8
|
0.08 |
|
OW%20strip.JPG)
OW observer chart
Euraster.net chords
|
Sep
06
|
(238)
Hypatia |
|
_report.JPG)
Additional Notes
|
12.0 |
13.4 |
11.2
/ 11.9 |
1.2 |
0.16 |
|
_OW.JPG)
Strong twilight (Sun at -7 deg).
Combined Mag 10.7, Barlow x2 used. Frame
|
Sept
23 |
(2875)
Largerkvist
|
|
%20Report.JPG)
Additional
Note
|
0.60 |
1.0 |
11
/
16 |
|
0.08 |
Frame
|

%20Euraster.jpg)
|
Sept
26 |
(1573)
Vaisala |
|
|
0.68 |
1.0 |
12
/
13 |
2.2 |
0.08 |
|
Shift indicated - only
one observation in Moonlight |
Oct
20 |
(27561)
2000 KJ1 |
|
Three observers got chords across this 20km object.
The preliminary Occult profile is elongated. |
2.12 |
2.0 |
13
/
17 |
4.0 |
0.16 |
LC_Pos.JPG)
|
2000%20KJ1%20PROFILE.jpg)
OW.JPG)
|
Oct
29 |
(156)
Xanthippe |
|
The best UK event of 2018 with 14 observers positive
following an alert to BAA members. |
5.70 |
7.0 |
12
/ 14 |
2.3 |
0.04 |
|
|
Nov
02 |
(137)
Maliboea |
|
report.JPG)
In strong twilight |
4.64 |
6.0 |
12.6
/ 13 |
0.5 |
0.16 |
|
|
<
Top >
9 (total
41) Positive Events
2019:
Date |
MInor
Planet |
Prediction |
Report |
Observed
duration |
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop |
Exposure |
Light
curve |
Chords
(credit: E. Frappa) |
Feb
12 |
(334)
Chicago
|
|
_Report%20Picture.JPG)
W25
red filter used in error. |
7.68 |
12
s
|
11.8
/ 13.0 |
1.5 |
0.16 |
|
|
March
8 |
(1093)
Freda |
|
Laptop bat. failed so used a camcorder. |
8.64 |
13
s |
13.2
/ 14.0 |
1.0
|
0.32 |
|
|
April
2
|
(554)
Paraga |
|
|
8.6 |
8.1s |
13.9
/ 12.6 |
0.2
small mag. drop
|
0.16 |
|
|
May
20 |
(671)
Carnegia |
|
|
1.8 |
2.0s |
11
/ 16 |
5.1 |
0.08 |
|
|
Jul
22
|
(580)
Selene |
|
The mount was moved 4m East
to avoid a tree. Long exposure and low altitude of 13 deg.
Report
|
0.9 |
3.0s |
12
/ 15 |
dM
2.7 |
0.32 |
_LC.JPG)
At 13deg elevation
|
|
Jul
26 |
(489) Comacina |
|
Poor weather forecast for this
favourable event. Sky cleared 1hr before commencement
Report
youtube
|
11.06
|
10.0s |
11
/ 13 |
dM
2.2 |
0.04s |
|
|
Jul
28 |
(586)
Thekla |
|
Low altitude
and noisy data. Lucky to record this at mag 13 in passing cloud.
Report
|
8.0s |
10.0s |
13
/ 14.5 |
dM
1.2 |
0.64s |
|
|
Nov
07 |
(563)
Suleika |
|
The small magnitude difference
of only 0.1 made this a difficult observation. A small dip was recorded
in the light curve => |
10
+/- 1s |
14
s |
14
/ 11 |
dM
0.1
small mag. drop |
0.16
s |
|
FIRST Positive event
from
Steeple Aston - hooraa ! |
Nov
30 |
(105)
Artemis |
|
# 9
Using C11 at F4 |
11.2 s |
12.1
s |
13.5 / 13.5 |
dM
0.7 |
0.16
s |
|
SECOND Positive event
from SA.
Usng a C11 |
< Top
>
5 (total
46) Positive Events
2020:
Date |
Body |
Prediction |
Report |
|
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop |
Exposure |
Light
curve |
Notes |
Mar
12 |
|
|
Single frame D-R |
0.2
Quite likely +ve, but NOT
confirmed
|
2
s |
12.9
/
14 |
3.7 |
|
|
_Montage.jpg)
|
Apr
15 |
(6723)
Chrisclark |
|
Cloud stayed
away until the last min. The D event was recorded in cloud and
the R was uncertain |
|
1.4
s |
10
/ 17 |
7.4 |
0.1
s
qhygps |
|
An observation from the Netherlands confirmed
I had observed the same chord. |
Jun
25 |
(121)
Hermione |
|
Observed
at low elivation of 8 degress in the SE. A pole caused the shadow
at start of recording. |
7.5
+/- 1.1 |
14
s |
11
/
12 |
0.3 |
0.64
s
qhygps |
|
|
Sep
27
|
(110989)
2001US197
|
|
unexpected
+ve
|
0.75
+/- 0.1 |
0.9
s |
12
/
19 |
7 |
0.1
s
qhygps
|
|
|
Nov
11
|
(70008)
1998 XA53
|
|
Report.JPG)
two chords from UK
|
1.30
+/-0.2 |
1.4
s |
13
/ 18 |
4 |
0.4
s
qhygps
difficult conditions |
|
|
7 (total 53)
Positive Events 2021 - 2 were uncertain.
[Table below]
Date |
Body |
Prediction |
Report |
|
Maximum
duration |
Mag.
Star
/ Astrd
|
Mag.
drop |
Exposure |
Light
curve |
Notes |
Jan
22 |
(1076)
Viola
|
|
|
|
2.8
s |
13.8
/14.5 |
0.9 |
|
|
|
Mar
13
|
(1342)
Brabantia
|
|
From the Pulsar observatory. |
|
1.0
s |
10.3/15 |
5.5 |
0.05
qhygps
|
|
|
Apr
17 |
(103)
Hera |
|
Chords
With fit to DAMIT
3D model
|
1.2
+/-0.3 |
4.0
s |
13/14 |
0.7 |
0.15
qhygps |
|
|
Jun
05
|
(2363)
Cebriones
|
|
LuckyStar
Uncertain in Twilight
- partial event
uncomfirmed.
|
3
? |
6
s |
14.2/15.5 |
2.1 |
0.4
ghygps
|
|
|
Jun
10
|
(663)
Gerlinde
|
|
Low altitude in Del.
Chords
Started recording just in time!
|
9.5
+/-0.3 |
12
s |
14.1/14.6 |
1.0 |
0.5
ghygps
|
|
|
Jly
29
|
|
|
Difficult conditions
Alt/Az 23/078
in Moonlight and
low mag drop.
Uncertain occn.
|
3.0
+/- 0.5 |
4.5
s |
14.0/15.0 |
0.2 |
0.5
qhygps
|
|
Pyote reports:
possible false positive
|
Aug
23
|
(1434) Margot |
|
S/N of 6 (good) and confirmed positive.
report |
3.9
+/- 0.25 |
5.0
s |
13.6/15.0 |
1.4 |
0.2
qhygps
|
|
|
Sept
20
|
2002GZ32 |
|
|
27s
+/- 1 |
32
s |
13.8
/ 19 |
5 |
1.0
qhygps
|
|
|
Oct 06
|
(32)
Pomona |
|
The star and asteroid formed a pair until the separation closed
up. The dip is seen in the blue light curve. |
6.9
s
+/- 0.2 |
6
s |
12.5
/ 13 |
0.3 |
0.1
qhygps
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 (total 73)
Positive Events 2022 (to date)
Date |
Body |
Prediction |
Report |
|
Maximum
duration |
Mag.
Star
/ Astrd
|
Mag.
drop |
Exposure |
Light
curve |
Notes |
Jan
05 |
(96)
Aegle
|
|
|
|
16
s |
14
/ 12.5 |
dM
0.1 |
|
|
|
Jan
12
|
(5022)
Roccapalumba
(Home STN)
|
|
_home_report.JPG)
|
|
2.3
s |
11 /
16 |
dM
6 |
0.08
QHY gps |
|
|
Jan
12 |
(5022)
Roccapalumba
(Mobile STN) |
|
|
2.00s |
2.3
s |
11 /
16 |
dM
6 |
0.08
Wat910HX
|
|
|
Jan
17
|
(37081)
2000 UW59
|
|
|
0.78
s |
0.7
s |
13 / 17 |
dM
4 |
0.12
Wat910HX |
|
|
Jan
27
|
(212)
Medea
|
|
|
48
+/-5 |
46
s |
13
/ 16 |
dM
0.1 |
0.5
QHYgps
|
|
|
Jan
29
|
|
|
|
1.45
|
2.5
s |
14 / 16 |
dM
2.1 |
0.1
QHYgps
|
|
|
Feb
25
|
(3572)
Leogoldberg |
|
|
2.50 |
2.0
s |
13.5 / 15 |
dM
3.8 |
0.2
QHYgps |
|
|
Mar
18
|
(115416)
2003 SP299
|
|
|
0.49 |
1.3
s |
13 /
19 |
dM
5.9 |
0.16
QHYgps |
|
|
Apr
02
|
(145)
Adeona |
|
|
3.4 |
4.0
s |
14 / 13 |
dM
0.4 |
0.25
QHYgps
|
|
|
Apr
15
|
(22)
Kalliope |
|
|
4.56 |
7
s |
13.6
/ 11.7 |
dM
0.3 |
0.25
QHYgps
|
|
|
May
21
|
(916)
America |
|
|
0.98 |
1.0
s |
11.4
/17 |
dM
6.0 |
0.05
QHYgps
|
|
|
Jun 11
|
(149)
Medusa
(MOBILE
STN)
|
|
|
1.60
+/-0.3 |
2.4
s |
12.8 / 13 |
dM
0.2 |
0.32
Wat910HX
|
|
|
Aug
11
|
(2241)
Alcathous |
|
Jupiter Trojan
No Times to report
|
5s
? |
8.9
s |
12 /
16 |
dM
3.4 |
10
s
at 2305UT
|
|
|
Aug
27
|
(1021)
Flammario
|
|
_rpt.JPG) |
3.5
s |
4
s |
13
/ 14 |
|
0.33
QHYgps
|
|
|
Sep
01
|
(780)
Armenia |
|
|
5.5
+/- 1 |
10.2
s |
15 / 14 |
dM
0.5 |
1.0
QHYgps
|
|
|
Sep
30
|
(1347)
Patria
|
|
|
2.18
s |
2.0
s |
13 / 16 |
dM
3.0 |
0.1
QHYgps
|
|
|
Sep
30
|
(1021)
Flammario |
|
|
6
s +/-1 |
6
s |
12 / 13 |
dM
0.4 |
0.2
QHYgps
|
|
|
Oct
03
|
(62029)
2000 RD55 |
|
|
1.28
s |
1.4
s |
13.7 / 16 |
dM
3.9 |
0.16
QHYgps
|
|
|
Nov
25
|
(344)
Desiderata |
|
|
7
+/- 2.4 |
8.0 |
14.5 /
13 |
|
0.2
QHYgps
|
|
|
Dec
08
|
(8067)
Helfenstein |
|
|
0.42 |
2.0 |
12.2 /
16 |
|
0.1
QHYgps
|
|
|
Dec
26
|
(2669)
Shostaovich
- 17Km diam.
|
|
|
1.2
+/- 0.1 |
1.6 |
13.8 /
17 |
dM
3.5
|
0.25
QHYgps
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8
(82) Positive Events
2023..
Date |
Body |
Prediction |
Report |
Observed
duration |
Maximum
duration |
Magnitude
Star
/ Astrd
|
Magnitude
drop |
Exposure |
Light
curve |
Notes |
Jan
10 |
(4471)
Graculus |
|
|
0.6
s |
1
s
|
12
/ 16 |
dM
4.2 |
|
|
|
Jan
21 |
(505)
Cava |
|
|
9.3
s |
13
s |
13
/ 11.4 |
|
|
|
|
Feb
10 |
(3687)
Dzus |
|
|
2.00
s |
2
s |
13
/
16 |
|
0.2
QHYgps
|
|
|
Feb
19 |
(912)
Maritima |
|
|
6.5
s +/-1 |
9
s |
15
/ 14 |
|
0.5
QHYgps
|
|
|
Feb
26 |
|
|
|
12.5
s |
14
s |
12
/ 11 |
|
0.1
QHYgps |
|
|
Mar
15 |
(393)
Lampetia
|
|
Through cloud, data almost lost |
4.7
s |
5
s |
13 /
12 |
|
0.25
QHYgps |
|
|
May
02 |
(618)
Elfriede |
|
|
16.3
+/- 1s |
21
s |
14 /
15 |
|
1.0
QHYgps
|
|
|
May
21
|
(5428)
Aizman |
|
|
1.50
s |
2.0 |
|
|
0.1
QHYgps |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|