IOTA/IOTA-ES occultation update for
(238) Hypatia / HIP 30327 = SAO 113788 on November 28/29, 2004
visible from NW Russia, SE Estonia, SE Latvia, NW Belarus, Lithuania,
Poland, W Czechia, Germany, Switzerland, France, NE Spain and N Portugal
Summary
In the night of November 28/29, 2004 a bright 8.4 mag star HIP 30327 = SAO 113788 will be occulted by a 156 km asteroid (238) Hypatia. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows ~0.5 path width N shift with time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.
!!! Very promising event !!! I have used UCAC2 star position instead of Hipparcos. Fortunately it doesn't matter too much which source is used. Position difference translates only to small relative time shift of predictions. Path runs over populated areas, so with a bit of weather luck we can have another nice hit.
Updated path runs over NW Russia around 22:44 UT, SE Estonia ~22:44.7 UT, SE Latvia ~22:44.9 UT, NW Belarus ~22:45.0 UT, Lithuania ~22:45.3 UT, Poland around 22:46.0 UT, W Czechia ~22:46.8 UT, Germany around ~22:47.1 UT, Switzerland ~22:47.8 UT, France around 22:48.4 UT, NE Spain ~22:49.5 UT and N Portugal ~22:50.0 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: November 28, 2004 @ 22:47 UT (Europe)
* magnitude of target star: 8.4
* magnitude drop [mag]: 3.9
* estimated maximum duration [s]: 16.5
* approx. V mag of minor planet at event [mag]: 12.3
* geocentric parallax of minor planet ["]: 4.708
* apparent motion of minor planet ["/h]: 25.13
* angular distance to moon, phase of moon [deg,%]: 23, 96%
* Goffin's original chart reference: A04_1131
The occultation path with path maps:
* approximate ground width [km]: 250
* uncertainty [path widths]: 0.52
* 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 NW Monoceros, about 0.6 degrees NNW of nice 13" wide double star 4.4+6.6 mag star epsilon Monocerotis = SAO 113810.
!!! 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 30327 = SAO 113788 = PPM 150384 = TYC 0141-00860-1
* constellation: Monoceros
* J2000 position [h,m,s; o,',"]: 06h 22m 44.6147s; +05d 07' 31.869"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.023" (0.015", 0.018")
* R mag [mag]: 8.37
* B-V [mag]: +0.08
* remarks:
Data for the minor planet:
* general information:
number, name: (238) Hypatia
approx. diameter [km]: 156
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), LaSilla (Raoul Behrend)
number of used observations: 116 USNO, 22 TMO, 5 LaSilla
number of rejected observations: 0
time covered by the observations: 1998 07 02 - 2004 11 04
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.09", 0.04"
remarks:
* orbital elements
Semimajor axis = 2.90636574598956 AU
Eccentricity = 0.088903214121933
Inclination = 12.4080600446565 deg
Long. of node = 184.2005234960126 deg
Arg. of pericenter = 206.9552560774316 deg
Mean anomaly = 46.7348895189202 deg
Epoch of elements : MJD 53337.95000000 TDT (Nov 28, 2004, 22.800000 h)
Path coordinates: click here
Calculator(s): Jan Manek
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Jan Manek
Werichova 950
152 00 Praha 5 - Barrandov |_|_|
Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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