IOTA/IOTA-ES occultation update for
(545) Messalina / TYC 4933-00970-1 = SAO 138253 on March 20/21, 2004
visible from Asia, Turkey, Bulgaria, Serbia, Bosnia, Croatia, N Italy,
SW Switzerland and middle France
Summary
In the night of March 20/21, 2004 a bright 8.7 mag star TYC 4933-00970-1 = SAO 138253 will be occulted by a 115 km asteroid (545) Messalina. This update is based on USNO/Flagstaff, TMO and OAC astrometry for the asteroid and Tycho-2 star position.
The updated path shows ~0.5 path width north shift with no time shift compared to Edwin Goffin's nominal prediction.
Updated path runs over Asia 21:49-21:54 UT, Turkey around 21:55 UT, Bulgaria ~21:55.9 UT, Serbia ~21:56.2 UT, Bosnia ~21:56.5 UT, Croatia ~21:56.7 UT, N Italy ~21:57.1 UT, SW Switzerland ~21:57.4 UT and middle France ~21:57.7 UT. Please check the path chart for details.
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Target star is brighter component of 11" wide pair STF 1548, fainter component is at PA 127° and brightness 9.8 mag. Hopefully this fact didn't affected the accuracy of Tycho-2 astrometry too much.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: March 20, 2004 @ 21:57 UT (Europe)
* magnitude of target star: 8.7
* magnitude drop [mag]: 5.0
* estimated maximum duration [s]: 7.7
* approx. V mag of minor planet at event [mag]: 13.7
* geocentric parallax of minor planet ["]: 3.609
* apparent motion of minor planet ["/h]: 30.60
* angular distance to moon, phase of moon [deg,%]: 169, 0%
* Goffin's original chart reference: A04_0325
The occultation path with path maps:
* approximate ground width [km]: 160
* uncertainty [path widths]: 0.75
* uncertainty in time [s]: 9
* map: Overview
European part
* remarks: Path uncertainties [2 sigmas] are given according to nominal star
position errors and expected asteroid positional accuracy.
Elements for WinOccult - use 'Save as ...' to download and save these elements.
Finding charts (prepared in GUIDE8):
* occulted star is in center - labeled with cross
* labeled stars have indicated SAO numbers
* (smaller) square box shows 30' field in all wider field charts
* (larger) square box shows 3° field in wide field charts
* remarks:
Target star is in south Leo, about 7.0 degrees southwest of 3.6 mag star beta Virginis = SAO 119076 or
41' southeast of 4.7 mag star 87 Leonis = SAO 138238.
!!! IMPORTANT !!!
Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields
the 'non-stars' are often real stars or blends of close pairs. Be careful about this.
40-degree chart
3-degree chart
0.5-degree chart
Data for the target star:
* name: TYC 4933-00970-1 = SAO 138253 = PPM 194557
* constellation: Leo
* J2000 position [h,m,s; o,',"]: 11h 32m 06.6320s; -03o 31' 53.021"
* position source: Tycho-2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 8.68
* B-V [mag]: +0.79
* remarks: Target star is brighter component of 11" wide pair STF 1548,
fainter component is at PA 127° and brightness 9.8 mag.
Data for the minor planet:
* general information:
number, name: (545) Messalina
approx. diameter [km]: 115
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), OAC (Angel Lopez)
number of used observations: 152 USNO, 12 TMO, 5 OAC
number of rejected observations: 0
time covered by the observations: 1998 02 26 - 2004 03 11
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.07", 0.04"
remarks:
Path coordinates: click here
Calculator(s): Jan Manek
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Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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