EAON - INFO N° 56

2007, January to March

203 observations have been performed during 2007, January to March ( 14 positive or possibly positive) about 87 events
( 7 positive or possibly positive) by 89 observers, from the 16 following countries (and numbers of observers) :

AT = Austria ( 1 ), BE = Belgium ( 5 ), BY = Belarus ( 5 ), CH = Switzerland ( 2 ), CZ = Czech Republic ( 11 ),
DE = Germany ( 17 ), ES = Spain ( 8 ), FR = France ( 18 ), GR = Greece ( 2 ), HU = Hungary ( 1 ), IT = Italy ( 3 ),
NL = The Netherlands ( 3 ), PL = Poland ( 5 ), RU = Russia ( 1 ), UA = Ukraine ( 1 ), UK = United Kingdom ( 5 ).

You will find in the table hereafter the list of the observers’ abbreviations in alphabetical order, with the number of observations made by each of them. Welcome to the new observers (in bold characters) !

AZO

Tibor AZTALOS

2

HU

JNK

Tomas JANIK

5

CZ

BAL

Ladislav BARAK

1

CZ

JSZ

Jacques SANCHEZ

4

FR

BAT

Karl Ludwig BATH

1

DE

KAD

Dimitrios KAPETANAKIS

1

GR

BDE

Hans BODE

1

DE

KHL

Mike KOHL

1

CH

BLM

Lex BLOMMERS

1

NL

KVM

Maxim KOTOV

1

BY

BOL

Simone BOLZONI

3

IT

LEI

Frank LEITER

3

DE

BTG

René BOURTEMBOURG

1

BE

LZJ

Joan LOPEZ – RODRIGUEZ

2

ES

BUL

Henk BULDER

1

NL

MBU

Michel BOUTET

6

FR

CHR

Bernard CHRISTOPHE

1

FR

MID

Thierry MIDAVAINE

1

FR

CPE

Emili CAPELLA

1

ES

MKM

Pawel MAKSYM

1

PL

MKV

Vitalij MECHINSKIJ

1

BY

MNK

Jan MANEK

1

CZ

DEN

Martin DENTEL

1

DE

MRX

Harald MARX

3

DE

DGG

Gerhard DANGL

14

AT

MVZ

Zdenek MORAVEC

1

CZ

DNZ

Helmut DENZAU

3

DE

NEB

Robert NEVILLE

1

UK

EBA

Eric BARBOTIN

1

FR

NNE

Claude NINET

2

FR

ELL

Andrew ELLIOTT

3

UK

NVI

Vitali NEVSKI

2

BY

EWL

Dieter EWALD

3

DE

OKE

Oliver KLOES

4

DE

OTA

Otta SANDOR

2

CZ

Thierry PAUWELS

1

BE

FIL

Denis FIEL

1

FR

with Pierre VINGERHOETS (VIG)

1

FIM

Marcin FILIPEK

3

PL

PCI

Paolo CORELLI

4

IT

FMY

Francois MEYER

1

FR

PLK

Jiri POLAK

1

CZ

FOC

Mario FERNANDEZ-OCANA

1

ES

PRB

Vaclav PRIBAN

1

CZ

Eric FRAPPA

1

FR

RAI

Manfred RAIN

1

DE

with M. LAVAYSSIERE (LVY)

3

FR

RKZ

Zbigniew RZEPKA

1

PL

FQS

Sebastien FRANCQ

2

BE

ROY

Rene ROY

1

FR

FST

Franz STARK

1

DE

RTH

Wolfgang ROTHE

4

DE

GAR

Faustino GARCIA de la CUESTA

2

ES

RVA

Joan ROVIRA

1

ES

GBL

Alfons GABEL

1

DE

SCB

Carles SCHNABEL

1

ES

GKG

Gleb GALKIN

1

BY

SLV

Antoni SELVA

1

ES

GRS

Christian GROS

1

FR

SMD

Libor SMID

1

CZ

GVB

Bernard GERVAIS

1

FR

SOR

Robert SIMONSON

1

UK

Claus-Peter HEIDMAN

1

DE

SPL

Jerzy SPEIL

2

PL

with Bernd GAEHRKEN (GKB)

1

DE

SPS

Stefano SPOSETTI

6

CH

HMG

Hazel Mc GEE

4

UK

SPU

Klaus SPRUCK

1

DE

HRU

Harrie RUTTEN

1

NL

STP

Roger STAPLETON

1

UK

IKY

Yuri IVASHENKO

1

UA

THO

Bertrand THOORIS

1

BE

IVY

Igor VINYAMINOV

1

RU

TKA

Ondrej TRNKA

1

CZ

JDJ

Jaromir JINDRA

1

CZ

TKO

Alexey TKACHENKO

1

BY

JFC

Jean Francois COLIAC

1

FR

trt

TAROT (see below)

39

FR

JGB

Jean-Gabriel BOSCH

1

FR

TSV

Vagelis TSAMIS

1

GR

JGS

Malcolm JENNINGS

4

UK

UTF

Ugo TAGLIAFERRI

1

IT

JLX

Jean LECACHEUX

5

FR

VSP

Valenti SALLARES – PUJOL

3

ES

ZAW

Marek ZAWILSKI

1

PL

ZJY

Jan ZAHAJSKY

1

CZ

TAROT (Acronym for "Télescope ŕ Action Rapide pour les Objets Transitoires") is an automatic telescope, located at Calern Observatory, dedicated to g -rays bursts optical study; when available, it can be used for various survey programs.

2007 (January to March) Observations

Observations are visual and negative, excepted when otherwise specified. All times are in UTC.

2007.01.03 : ( 2521 ) Heidi / TYC 4925-00252-1

only one positive observation :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

trt

N 43 45 08

E 06 55 26

+1270 m

03:39:09.40 ± 0.5 s

03:39:10.43 ± 0.5 s

1.03 ± 0.05 s

The max predicted duration was 1.6 s; incertitude was great for this small asteroid (15 km).

2007.01.04 : ( 144 ) Vibilia / TYC 1888-00747-1 BOL DGG

DGG : videorecording

2007.01.05 : ( 3025 ) Higson / 2UCAC 42564704 PCI trt

PCI : CCD drift-scan

2007.01.08 : ( 6222 ) 1980PB3 / TYC 3408-02545-1 DGG

DGG : videorecording

2007.01.09 : ( 1926 ) Demiddelaer / TYC 4685-01391-1

Two positive observations :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

MBU and JSZ

N 43 23 42.8

E 01 19 02.4

+276 m

18:27:40.9 ± 0.06 s

18:27:41:85 ± 0.06 s

0.95 s

MBU only

N 43 23 42.8

E 01 19 02.4

+276 m

18:27:51.55 ± 0.06 s

18:27:55.70 ± 0.06 s

4.15 s

The event was nearly central, since max predicted duration was 1.0 s; incertitude was great for this small asteroid (16 km). Second MBU observation must be spurious, as its duration is much too long to be in relation with the asteroid.

2007.01.10 : ( 1024 ) Hale / TYC 2416-1207-1 JLX PAW with VIG trt

PAW : CCD imaging

2007.01.11 : ( 9199 ) 1993 FO1 / TYC 2389-01509-1 HMG JGS JLX trt

JGS : videorecording.

Incertitude was great for this small asteroid (12 km).

The target star is the binary Aitken 211 = ADS 3808, with r = 4.6", Q = 135°, according to the Tycho CCDM. The companion unresolved by the UCAC instrument could have induced a slight southward shift of the occultation track.

2007.01.14 : ( 840 ) Zenobia / HIP 29196 FIM GKG JNK KVM MKM
MKV RKZ SPL TKO ZAW

JNK : videorecording; KVM : in double station with MKV.

RKZ was in the predicted path. The real one has been shifted but the lack of positive observation lets its position remaining unknown.

2007.01.14 : ( 916 ) America / TYC 1187-00532-1 BDE FQS HRU JLX

OKE PAW RTH

and three positive observations :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

BTG

N 50 17 40.5

E 05 06 25.8

+321 m

19:03:56.5 ± 0.1 s

19:03:57.5 ± 0.1 s

1.0 s

JNK

N 50 44 00.2

E 14 00 09.1

+462 m

19:04:12.2 ± 0.15 s

19:04:14.4 ± 0.3 s

2.2 s

MVZ

N 50 38 44

E 14 00 50

+251 m

19:04:14.1 ± 0.15 s

19:04:15.5 ± 0.1 s

1.4 s

JNK : videorecording, reported a flash at 19:04:13.0 ± 0.25, lasting 0.3-0.4 s

OKE, RTH : videorecording; PAW : CCD imaging

As the chords are scattered, one can only deduce from the observations that the profile is irregular or elongated (the max duration was 1.2 s, assuming a circular profile with a 30 km diameter).

The observations show the real path has been shifted toward south by about 1.5 times its width (0.04").

The target star is catalogued as binary : Heintz 17: A-B : 9.7-12.3, r = 1.7", Q = 224° in 1978. The secondary star unresolved by the UCAC instrument can explain at least a part of the south shift of the occultation track.

2007.01.14 : ( 498 ) Tokio / TYC 1884-01139-1 AZO PCI ROY SPS trt

PCI, ROY, SPS : CCD drift scan

2007.01.17 : (2672 ) Pisek / TYC 0723-00844-1 AZO DGG EWL PRB

DGG : videorecording; PRB : videorecording, many interruptions due to clouds

2007.01.19 : (694 ) Ekard / TYC 4892-00011-1

TSV reported two possibly positive observations from two observers, both from Greece and in the predicted shadow path :
G. Koronis from Kalamata, (N 37 03 ??, E 22 07 ??) and D. Papadimopoulos from Nafplion (N 37 34 ??, E 22 48 ??)

2007.01.20 : ( 3312 ) Pedersen / TYC 0749-00958-1 BOL SPS trt

SPS : CCD drift scan, was at immediate vicinity of the predicted track. No occultation with duration >1s.

2007.01.22 : ( 4831 ) Baldwin / TYC 1863-01257-1 DEN DNZ ELL EWL

RTH STP

DEN, DNZ, ELL, RTH : videorecording; STP : CCD drift-scan; EWL : no occ. > 0.5 s.

2007.01.25 : ( 132 ) Aethra / 2UCAC 39606679 DGG ELL LEI

DGG, ELL : videorecording

2007.01.27 : ( 5357 ) 1992EL / TYC 1395-00346-1 JSZ MBU

MBU and JSZ in double station at the Pic-du-Midi observatory, were 70km north of the predicted centreline.

2007.01.27 : ( 4315 ) Pronik / TYC 2954-00067-1 JSZ MBU

MBU and JSZ in double station at the Pic-du-Midi observatory, were 58km south of the predicted centreline.

2007.01.28 : ( 2649 ) Oongaq / 2UCAC 34620795 CQU with VDC JLX JSZ
CQU : CCD drift scan; JLX : CCD imaging MBU trt

JLX, MBU and JSZ in multiple station at the Pic-du-Midi observatory, were on the centreline according to the last update.

2007.01.30 : ( 87 ) Sylvia / TYC 2467-00132-1 KAD TSV

TSV : videorecording; KAD and TSV in double station. No occultation observed at Larissa (Greece), almost on the S. Preston predicted centreline.

(87) Sylvia has two known satellites, called Romulus (orbiting at 1355 km with an 88 hours period) and Remus (resp. 705 km and 33 hours). The respective diameters are ~18 and ~7 km, whereas Sylvia itself is a 385 × 230 km body. Thanks to five years of astrometric observations and to the IMCCE (J. Berthier) work, an ephemeris of Romulus has been established and used by JLX to prepare a prediction for its path, 300 km southerly the Sylvia one and 45 s in advance.

Note that the prediction by S. Preston was half a path width north (130 km and 4 s late) compared to the IMCCE result and to the E. Goffin's initial prediction. Negative observations may show that the real path has been shifted relative to S. Preston’s prediction. Nevertheless, observers may have missed the occultation only because of the marked ellipsoidal form of the asteroid (a mean 261 km diameter has been used for calculations).

2007.02.01 : ( 1437 ) Adria / TYC 1775-00110-1

only one uncertain positive observation :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

UTF

N 41 45 55

E 13 22 30

+555 m

17:33:31.2 ± 0.3 s

17:33:31.4 ± 0.3 s

about 0.2 s or less

UTF was about 1.5 path width southerly of the predicted track, but event occurred at the predicted appulse time for his location.

2007.02.01 : ( 5505 ) Rundetaarn / 2UCAC 43065933 DGG RTH

DGG, RTH : videorecording; incertitude was very large for this small asteroid (16 km).

2007.02.06 : ( 2661 ) Bydzovsky / TYC 1789-00908-1 ELL JGS

ELL, JGS : videorecording; incertitude was very large for this small asteroid (18 km).

2007.02.11 : ( 356 ) Liguria / TYC 1791-00912-1 NVI

2007.02.12 : ( 12080 ) 1998FC111 / TYC 1325-00304-1 GAR

2007.02.14 : ( 801 ) Helwerthia / 2UCAC 33185053 GAR HMG JGS

JGS : videorecording; all observers were in the predicted path. Negative observations show the real path has been shifted but the lack of positive observation lets its position remaining unknown.

2007.02.15 : ( 577 ) Rhea / 2UCAC 37894136 BOL FRP with LVY MBU SPS

FRP : videorecording, was 7.4km north of the S. Preston’ predicted centreline;

SPS : CCD drift scan, was just at the southern border, no occ. > 0.2 s.

The real path has been shifted but the lack of positive observation lets its position remaining unknown.

2007.02.15 : ( 655 ) Briseis / 2UCAC 38788750 NVI

2007.02.16 : ( 3730 ) Hurban / TYC 1393-01912-1 CQU with VDC FOC FRP GVB
JFC JSZ MBU trt

CQU, JFC : CCD drift scan; FOC, FRP : videorecording

MBU, JSZ and GVB : triple station, were at 15 km of the predicted centreline

2007.02.17 : ( 2867 ) Steins / TYC 2430-01121-1 DGG HCP IKY OKE

DGG, OKE : videorecording; HCP: videorecording, no occ. > 0.2 s; IKY : CCD drift scan

Despite the great incertitude and the low probability of occurrence, due to the small asteroid diameter (9 km), this event was of very high scientific interest : (2867) Steins will be visited by Rosetta spacecraft on 2008.09.05. The event was posted on Denis Denissenko’ website and S. Preston issued three last-minute updates.

2007.02.17 : ( 1988 ) Delores / TYC 1279-01433-1 DGG FIM HCP with GKB SPL

and one uncertain positive observation :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

OTA

N 50 40 00.5

E 13 46 44.1

+297 m

20:34:33.3 ± 0.2 s

20:34:34.6 ± 0.2 s

1.3 s

DGG : videorecording; HCP: videorecording, no occ. > 0.2 s

OTA was just at immediate vicinity of the southern border; the event occurred 10 s sooner than the appulse time predicted for this location.

2007.02.18 : ( 1419 ) Danzig / 2UCAC 34460503 DGG FIM

DGG : videorecording

2007.02.20 : ( 6983 ) Komatsusakyo / TYC 0296-00826-1 SPS

SPS : CCD drift scan

2007.02.23 : ( 491 ) Carina / TYC 0152-01386-1 JGB MRX

and one positive observation :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

GRS

N 47 07 35

E 06 03 11

+505 m

18:49:43.45 ± 0.25 s

18:49:52.05 ± 0.25 s

8.6 ± 0.05 s

JGB : CCD drift scan

GRS was close to the centreline, as max predicted duration was 9.7 s. The path has been slightly shifted toward west (0.25 path width).

2007.02.23 : ( 2169 ) Taiwan / 2UCAC 39973528 DGG LEI SPU

DGG : videorecording ; LEI and SPU in double station.

2007.02.27 : ( 389 ) Industria / 2UCAC 39968314 HMG

2007.03.01 : ( 265 ) Anna / TYC 3358-01200-1 BAL GBL JNK LZJ OKE
OTA and BAL in double station, videorecording; GBL : no occ. > 0.2 s OTA

2007.03.04 : ( 494 ) Virtus / TYC 2403-01283-1 MRX

2007.03.07 : ( 1579 ) Herrick / 2UCAC 36438710 HMG JGS

JGS : videorecording. Both observers were close to or in the predicted track.

2007.03.08 : ( 1579 ) Herrick / TYC 0745-01659-1 THO

2007.03.08 : ( 16593 ) 1992UB3 / TYC 1979-00323-1 RAI

2007.03.09 : ( 3168 ) Lomnicky stit / 2UCAC 42712359 FQS MID

MID : videorecording, was at immediate vicinity of the predicted track.

2007.03.09 : ( 389 ) Industria / HIP 19417 FRP with LVY NNE VSP

FRP : videorecording; NNE : CCD drift scan

FRP and LVY were in the predicted track. The real path has been shifted despite the high probability of a positive event on the centre line (90%). The lack of positive observation lets its position remaining unknown.

2007.03.09 : ( 302 ) Clarissa / 2UCAC 40642517 NNE VSP

NNE : CCD drift scan; VSP was in the predicted path. The same conclusion as previously can be drawn.

2007.03.09 : ( 1082 ) Pirola / TYC 1402-01111-1 CPE FRP with LVY LZJ
RVA SCB SLV VSP

FRP, LZJ, RVA, SCB, SLV : videorecording; NNE : CCD drift scan ;

CPE, SCB and SLV were in the predicted track. The same conclusion as previously can be drawn.

2007.03.10 : ( 3730 ) Hurban / TYC 1392-02697-1 EBA JLX PCI SPS

EBA, PCI, SPS : CCD drift scan; JLX : CCD imaging.

EBA, PCI and SPS were at immediate vicinity of the predicted track.

2007.03.11 : ( 1681 ) Steinmetz / HIP 47247 BAT FIL KHL PCI

FIL, PCI : CCD drift scan; BAT, SOR : videorecording. SOR

FIL, KHL and PCI were in the predicted track.

2007.03.13 : ( 5567 ) Durisen / TYC 2930-02097-1 DGG DNZ FAR with EEA

DGG, DNZ, FAR, OKE, RTH : videorecording; JNK LEI MRX OKE RTH trt

JNK : two blinks at 21:43:00 and 21:43:05

2007.03.15 : ( 1278 ) Kenya / 2UCAC 35760989 FMY SPS

FMY, SPS : CCD drift scan; FMY : spurious star disappearances on four frames

2007.03.16 : ( 623 ) Chimaera / TYC 1870-01407-1 DGG SMD

DGG, SMD : videorecording.

2007.03.18 : ( 795 ) Fini / HIP 17467 EWL

EWL : blink at 19:52:44.9, probably not related to (795) Fini, as he was far (three path widths) from the track.

2007.03.18 : ( 42 ) Isis / 2UCAC 41689535 IVY

2007.03.21 : ( 2983 ) Poltava / TYC 1293-02540-1 NEB

NEB was in the predicted track but probability of a positive event on the centre line was low (15%).

2007.03.22 : ( 44 ) Nysa / 2UCAC 39825254 CHR

CHR : N 49 21 03.71 E 02 07 22.03 +? m

[asteroid 0.025" ±0.04" S of star at 19:25:19 ±3 sec., from 7 CCD images]

Note that the apparent asteroid diameter was 0.056", so CHR was probably very close to the track. The appulse was predicted at 19:25:20 ±5s at his location.

2007.03.22 : ( 1940 ) Whipple / TYC 1348-01639-1 BLM DGG

DGG : videorecording; BLM : an occultation of less then 1 s might have been unnoticed

2007.03.25 : ( 772 ) Tanete / TYC 1804-01859-1 DGG

DGG : videorecording

2007.03.28 : ( 751 ) Faina / TYC 5611-00667-1 JNK ZJY

and four positive observations :

Abbr.

Latitude

Longitude

Height

Disappearance UT

Reappearance UT

Duration

MNK

N 49 53 04.45

E 14 06 30.85

+454 m

22:47:30.0 ± 0.08 s

22:47:43.28 ± 0.08 s,
gradual, lasting approx. 0.16s

13.28 s

JDJ

N 49 52 38.0

E 13 47 05.8

+541 m

22:47:30.6 ± 0.1 s

22:47:51.20 ± 0.05 s

20.65 s

PLK

N 49 41 19.1

E 13 14 41.5

+334 m

22:47:34.65 ± ?

22:48:06.74 ± ?

32.09 s

TKA

N 49 37 14.4

E 13 08 28.8

+388m

22:47:38.0 ± ? (gradual)

22:48:11.1 ± ?

33.1 s

FST

N 51 34 40.8

E 07 12 33.9

+65 m

22:48:12.99 ± 0.04 s

22:48:23.79 ± 0.04 s

10.80 s

Chords draw half of an elongated profile, the shot axis running parallel to the asteroid motion. This could explain the positive and unexpectedly long observations of MNK (resp. FST), who were at immediate vicinity of the northern border of the path, just inside (resp. outside) it. TKA was on the predicted centreline. The maximum duration was 44 s, assuming a 110 km mean diameter.

DGG, FST, MNK : videorecording

2007.03.31 : ( 2428 ) Kamenyar / TYC 2408-00093-1 BUL DGG DNZ

DGG, DNZ : videorecording; BUL : difficult observation

DGG was in the predicted track but probability of a positive event on the centre line was low (8%).

The 30 following events have been observed by TAROT only – all negative results :

2007/01/03 2521 Heidi TYC 4925-00252-1 2007/01/05 8747 Asahi 2UCAC 33709971

2007/01/06 2333 Porthan TYC 2909-01265-1 2007/01/07 491 Carina TYC 4819-01907-1

2007/01/08 697 Galilea TYC 2888-00152-1 2007/01/08 4422 Jarre TYC 1314-00001-1

2007/01/09 18897 2000 HG30 TYC 1285-00760-1 2007/01/09 8223 Bradshaw TYC 1322-01175-1

2007/01/10 3125 Hay TYC 0772-01198-1 2007/01/11 2975 Spahr TYC 0769-00389-1

2007/01/12 1904 Massevitch TYC 1911-00288-1 2007/01/12 805 Hormuthia TYC 4941-01182-1

2007/01/14 1511 Dalera TYC 0646-00018-1 2007/01/14 20569 1999 RP132 2UCAC 35576622

2007/01/18 4523 MIT HIP 41688-1 2007/01/18 5288 Nankichi HIP 34540

2007/01/23 955 Alstede TYC 2433-00764-1 2007/01/24 1153 Wallenbergia TYC 1863-01039-1

2007/01/26 1948 Kampala TYC 2454-01438-1 2007/01/28 419 Aurelia 2UCAC 38407618

2007/01/28 10391 1997 RR3 TYC 0165-00043-1 2007/01/29 2841 Puijo TYC 1900-00731-1

2007/01/30 17839 1998 HN95 2UCAC 32514171 2007/01/30 52567 1997 HN2 TYC 1986-00538-1

2007/01/30 510 Mabella TYC 0748-00395-1 2007/02/03 6911 Nancygreen 2UCAC 21317639

2007/02/04 1786 Raahe TYC 1220-01505-1 2007/02/04 28610 2000 EM158 TYC 2415-00928-1

2007/02/05 37 Fides TYC 1916-00059-1 2007/02/15 36205 1999 TV101 TYC 2461-01500-1

It is necessary to send a report even if there has been no occultation from your place (negative observation). These negative observations can sometimes be of as great interest as positive ones : they can be decisive to determine the shape ("shepherd observations"), refine the orbit of the asteroid or discover un unknown satellite !  

Please DON’T FORGET to use the IAU format YYMMDD for the date of your reports. Clear skies for all.

 

G. REGHEERE gillesregheere@yahoo.fr

96 rue de Mercantour

78310 Maurepas - FRANCE