Recent Positive Asteroid Occultations

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.

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

Date	Body	Prediction	Link to report	Observed duration	Maximum duration	Magnitude Star / Astrd	Magnitude drop dM	Exposure	Light curve	Chords
Feb 20	(130) Elektra		Report	10.7	16.2 s	11.5 / 12.2	0.9	0.16		Chords
Mar 01	(532) Herculina		Report	5.8	23.0 s	10.0 / 8.9	0.33	0.64		One observer
Jun 05	(80) Sappho		Report	6.72	8.1 s	10.7 / 11.7	1.4	0.16		Chords
Oct 31	(213) Lilaea	Track Track-2	Report	7.1	5.9 s	10.8 / 12.8	2.2	0.64		One Observer

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

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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	(41) Daphne		Report	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	(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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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 (24) 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	1.4	0.64
Nov 19	(18) Melpomene			2.64	5	12 / 12.8	0.7	0.04
Nov 28	(377) Campania			8.4	9	12 / 13	0.2	0.04

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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			7.42	9.5	12.9 / 13.4	0.8	0.08		OW observer chart Euraster.net chords
Sep 06	(238) Hypatia		Additional Notes	12.0	13.4	11.2 / 11.9	1.2	0.16		Strong twilight (Sun at -7 deg). Combined Mag 10.7, Barlow x2 used. Frame
Sept 23	(2875) Largerkvist		Additional Note	0.60	1.0	11 / 16	0.4 Double Star Comes	0.08	Frame
Sept 26	(1573) Vaisala			0.68	1.0	12 / 13	2.2	0.08	Frame	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
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		In strong twilight	4.64	6.0	12.6 / 13	0.5	0.16

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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		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	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		Chords
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	AOTA	Chords
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

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5 (total 46) Positive Events 2020:

Date	Body	Prediction	Report	Observed duration	Maximum duration	Magnitude Star / Astrd	Magnitude drop	Exposure	Light curve	Notes
Mar 12	(996) Hilaritas		Single frame D-R	0.2 Quite likely +ve, but NOT confirmed	2 s	12.9 / 14	3.7	0.2 s
Apr 15	(6723) Chrisclark		Cloud stayed away until the last min. The D event was recorded in cloud and the R was uncertain	1.25 +/- 0.4	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		chords
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		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	Observed duration	Maximum duration	Mag. Star / Astrd	Mag. drop	Exposure	Light curve	Notes
Jan 22	(1076) Viola			1.3 +/- 0.1	2.8 s	13.8 /14.5	0.9	0.2 qhygps
Mar 13	(1342) Brabantia		From the Pulsar observatory.	0.81 +/-0.06	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	(212) Medea O?		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		Centaur for the lucky-star campaign	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	Measured duration	Maximum duration	Mag. Star / Astrd	Mag. drop	Exposure	Light curve	Notes
Jan 05	(96) Aegle			14 s	16	14 / 12.5	0.1	0.33 qhygps
Jan 12	(5022) Roccapalumba (Home STN)			1.36 s	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	(1654) Bojeva			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