IOTA/IOTA-ES occultation update for
(773) Irmintraud / HIP 186 = SAO 128544 on July 20/21, 2004
visible from Africa, NE Algeria, NE Spain, France, SW England and Ireland
Summary
In the night of July 20/21, 2004 a bright 6.3 mag star HIP 186 = SAO 128544 will be occulted by a 99 km asteroid (773) Irmintraud. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Hipparcos star position.
The updated path shows ~3 path width east shift with time ~0.1 minutes earlier compared to Edwin Goffin's nominal prediction. Compared to first update, this one puts path ~0.1 path width (~12km) to west with no significant time correction.
Updated path runs over Africa ~1:08-1:16 UT, NE Algeria ~1:16.5 UT, NE Spain ~1:17.5 UT, France around ~1:18.2 UT, SW England ~1:19.0 UT and Ireland ~1:19.4 UT. Please check the path chart for details.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: July 21, 2004 @ 01:18 UT (Europe)
* magnitude of target star: 6.3
* magnitude drop [mag]: 7.7
* estimated maximum duration [s]: 11.1
* approx. V mag of minor planet at event [mag]: 14.0
* geocentric parallax of minor planet ["]: 4.164
* apparent motion of minor planet ["/h]: 21.05
* angular distance to moon, phase of moon [deg,%]: 152, 12%
* Goffin's original chart reference: A04_0744
The occultation path with path maps:
* approximate ground width [km]: 120
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 16
* 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 east Pisces, about 2.2 degrees NNW of 4.0 mag star omega Piscii = SAO 128513.
!!! 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: HIP 186 = SAO 128544 = PPM 143079 = TYC 0594-00999-1
* J2000 position [h,m,s; o,',"]: 00h 02m 24.1671s; +08o 57' 24.549"
* position source: Hipparcos
* estimated accuracy ["]: 0.02" (0.01", 0.01")
* V mag [mag]: 6.33
* B-V [mag]: +0.18
* remarks:
Data for the minor planet:
* general information:
number, name: (773) Irmintraud
approx. diameter [km]: 99
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 120 USNO, 5 TMO
number of rejected observations: 0
time covered by the observations: 1998 03 10 - 2004 07 11
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.12", 0.05"
remarks:
Path coordinates: click here
Calculator(s): Jan Manek