Last
Updated 2022 April 18th
HISTORY:
Read about this observers equipment evolution
from 1980-2020
Update:
From 2019-Nov-30, the OTA is a Celestron
11 on EQ6Pro working at about F5.6. Then from January 2020, I started
using the USB3 QHY174m-GPS
camera recording to W10 laptop. The WAT-910HX video is still the more
sensitive detector andis reserved for more demanding events, but is less
convenient to control. In the last few years
there has been a Pro-Am collaboration (
Lucky-Star ) to which amateurs can send observations of special interest.
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, Red
= 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
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>
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 |
|
|
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>
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
|
|
|
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>
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)
|
|
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>
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 s
qhygps
|
|
|
Sept
20
|
2002GZ32 |
|
|
27s
+/- 1 |
32
s |
13.8
/ 19 |
5 |
1.0
s
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
s
qhygps
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 (total 63) Positive
Events 2022 (so far)
Date |
Body |
Prediction |
Report |
|
Maximum
duration |
Mag.
Star
/ Astrd
|
Mag.
drop |
Exposure |
Light
curve |
Notes |
Jan
05 |
(96)
Aegle
|
|
|
|
16
|
14
/ 12.5 |
0.1 |
|
|
|
Jan
12
|
(5022)
Roccapalumba
(Home STN)
|
|
_home_report.JPG)
|
|
2.3 |
11 /
16 |
6 |
0.08
qhygps |
|
|
Jan
12 |
(5022)
Roccapalumba
(Mobile STN) |
|
|
2.00s |
2.3 |
11 /
16 |
6 |
0.08
Wat910HX
|
|
|
Jan
17
|
(37081)
2000 UW59
|
|
|
0.78
s |
0.7 |
13 / 17 |
4 |
0.12
Wat910HX |
|
|
Jan
27
|
(212)
Medea
|
|
|
48
+/-5 |
46 |
13
/ 16 |
0.1 |
0.5
QHYgps
|
|
|
Jan
29
|
|
|
|
1.45
|
2.5 |
14 / 16 |
2.1 |
0.1
QHYgps
|
|
|
Feb
25
|
(3572)
Leogoldberg |
|
|
2.50 |
2.0 |
13.5 / 15 |
3.8 |
0.2
QHYgps |
|
|
Mar
18
|
(115416)
2003 SP299
|
|
|
0.49 |
1.3 |
13 /
19 |
5.9 |
0.16
QHYgps |
|
|
Apr
02
|
(145)
Adeona |
|
|
3.4 |
4.0 |
14 / 13 |
0.4 |
0.25
QHYgps
|
|
|
Apr
15
|
(22)
Kalliope |
|
|
4.56 |
7 |
13.6
/ 11.7 |
0.3 |
0.25
QHYgps
|
|
|
May
21
|
(912)
America |
|
|
0.98 |
1.0 |
11.4
/16 |
5.0 |
0.05
QHYgps
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|