IOTA/IOTA-ES occultation update for
(210) Isabella / GSC 6908-01885 on November 1/2, 2004
visible from England only
Summary
In the night of November 1/2, 2004 a faint 11.6 mag star GSC 6908-01885 will be occulted by a 90 km asteroid (210) Isabella. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~4 path width N shift with small time correction compared to Eric Frappa's nominal prediction.
Updated path runs over England ~18:39.2 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 1, 2004 @ 18:39 UT (Europe)
* magnitude of target star: 11.6
* magnitude drop [mag]: 3.1
* estimated maximum duration [s]: 4.5
* approx. V mag of minor planet at event [mag]: 14.6
* geocentric parallax of minor planet ["]: 3.483
* apparent motion of minor planet ["/h]: 39.31
* angular distance to moon, phase of moon [deg,%]: 148, 81%
* Goffin's original chart reference: A04_XXXX
The occultation path with path maps:
* approximate ground width [km]: 170
* uncertainty [path widths]: 1.0
* uncertainty in time [s]: 8
* 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 SW Capricornus, about 3.6 degrees WNW of 4.1 mag star psi Capricorni = SAO 189664.
!!! 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: GSC 6908-01885 = 2UCAC 22122452
* constellation: Capricornus
* J2000 position [h,m,s; o,',"]: 20h 31m 16.5859s; -24d 04' 46.973"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.030" (0.024", 0.018")
* R mag [mag]: 11.59
* B-V [mag]: +?.??
* 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: 155 USNO
number of rejected observations: 0
time covered by the observations: 1998 03 03 - 2004 10 16
rms residuals ["] (RA,DE): 0.11", 0.12"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.06", 0.03"
remarks:
* orbital elements
Semimajor axis = 2.72145873683988 AU
Eccentricity = 0.124450341368054
Inclination = 5.2613174324715 deg
Long. of node = 32.8594435486068 deg
Arg. of pericenter = 13.9185183580134 deg
Mean anomaly = 293.3302899080471 deg
Epoch of elements : MJD 53310.78000000 TDT (Nov 1, 2004, 18.720000 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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