IOTA/IOTA-ES occultation update for
(987) Wallia / TYC 6119-00572-1 = PPM 261404 on April 23/24, 2004
visible from Middle East, Crete, S Italy, France, SW England and Ireland
Summary
In the night of April 23/24, 2004 a bright 9.9 mag star TYC 6119-00572-1 = PPM 261404 will be occulted by a 45 km asteroid (987) Wallia. This update is based on USNO/Flagstaff and OAC astrometry for the asteroid and UCAC2 star position.
The updated path shows ~3.5 path width north shift with time ~0.6 minutes earlier compared to Eric Frappa's nominal prediction.
Updated path runs over Middle East ~23:21 UT, Crete ~23:22.7 UT, S Italy ~23:23.7 UT, France from SE to NW around 23:25.1 UT, SW England ~23:25.7 UT and Ireland ~23:26.0 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: April 23, 2004 @ 23:25 UT (Europe)
* magnitude of target star: 9.9
* magnitude drop [mag]: 4.9
* estimated maximum duration [s]: 3.0
* approx. V mag of minor planet at event [mag]: 14.8
* geocentric parallax of minor planet ["]: 3.472
* apparent motion of minor planet ["/h]: 29.02
* angular distance to moon, phase of moon [deg,%]: 122, 17%
* Goffin's original chart reference: A04_XXXX
The occultation path with path maps:
* approximate ground width [km]: 100
* uncertainty [path widths]: 2.3
* uncertainty in time [s]: 15
* 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 Virgo, about 9.2 degrees SSW of 1.0 mag star alpha Virginis = SAO 157923 = Spica
or 3.3 degrees NNW of 3.0 mag star gamma Hydrae = SAO 181543. Should be easy to find due to pair of
5-mag stars SAO 157806 and 157823 close to target.
!!! 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 6119-00572-1 = PPM 261404
* constellation: Virgo
* J2000 position [h,m,s; o,',"]: 13h 15m 17.5285s; -20o 03' 29.925"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 9.93
* B-V [mag]: +1.21
* remarks:
Data for the minor planet:
* general information:
number, name: (987) Wallia
approx. diameter [km]: 45
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), OAC (A.Lopez, R.Pacheco, J.Forteza)
number of used observations: 126 USNO, 4 OAC
number of rejected observations: 0
time covered by the observations: 1998 03 02 - 2004 04 13
rms residuals ["] (RA,DE): 0.15", 0.15"
estimated positional accuracy at epoch of event ["]: 0.11", 0.05"
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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