IOTA/IOTA-ES occultation update for
(210) Isabella / HIP 22711 = SAO 76805 on November 27/28, 2005
visible from Middle East, NE Egypt, N Tunisia, N Algeria and S Spain
Summary
In the night of November 27/28, 2005 a bright 8.2 mag star HIP 22711 = SAO 76805 will be occulted by a 90 km asteroid (210) Isabella. This update is based on USNO/Flagstaff astrometry for the asteroid and Hipparcos star position.
The updated path shows ~2.0 path width south shift with time ~0.4 minutes laterer compared to Edwin Goffin's nominal prediction.
Updated path runs over Middle East ~0:19.8 UT, NE Egypt ~0:20.4 UT, N Tunisia ~0:23.6 UT, N Algeria ~0:24.5 UT and S Spain ~0:25.8 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, 2005 @ 00:26 UT (Europe)
* magnitude of target star: 8.2
* magnitude drop [mag]: 4.3
* estimated maximum duration [s]: 9.1
* approx. V mag of minor planet at event [mag]: 12.5
* geocentric parallax of minor planet ["]: 6.141
* apparent motion of minor planet ["/h]: 34.31
* angular distance to moon, phase of moon [deg,%]: 126, 14%
* Goffin's original chart reference: A05_1138
The occultation path with path maps:
* approximate ground width [km]: 90
* uncertainty [path widths]: 0.8
* 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:
!!! 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 22711 = SAO 76805 = PPM 93849 = TYC 1839-01639-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 04h 53m 00.8433s; +28d 06' 23.979"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.010", 0.012"
* V mag [mag]: 8.23 (Hipparcos)
* B-V [mag]: +0.56 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (210) Isabella
approx. diameter [km]: 90
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 162 USNO
number of rejected observations: 0
time covered by the observations: 1998 03 03 - 2005 11 03
estimated positional 2-sigma accuracy at epoch of event ["]: 0.148", 0.060", 81 deg
remarks:
* orbital elements
Semimajor axis = 2.72146560771927
Eccentricity = 0.124360878068926
Inclination = 5.2613187783662 deg
Long. of node = 32.8579211619894 deg
Arg. of pericenter = 13.8416792934755 deg
Mean anomaly = 19.2779322596639 deg
Epoch of elements : MJD 53702.02000000 TDT (Nov 28, 2005, 0.480000 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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