IOTA/IOTA-ES occultation update for
(210) Isabella / TYC 1850-01255-1 on October 3/4, 2005
visible from NW Africa, S Italy, Serbia, Romania, Moldova,
Ukraine and Russia
Summary
In the night of October 3/4, 2005 a faint 10.6 mag star TYC 1850-01255-1 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 ~1 path width south shift with time ~0.1 minutes later compared to Edwin Goffin's nominal prediction.
Updated path runs over NW Africa ~1:29-135 UT, S Italy ~1:37.0 UT, Serbia ~1:38.1 UT, Romania ~1:39.0 UT, Moldova ~1:39.9 UT, Ukraine ~1:40.6 UT and Russia ~1:42-1:46 UT. Please check the path chart for details.
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The event at one glimpse:
* date and approx. UT time of event: October 04, 2005 @ 01:40 UT (Europe)
* magnitude of target star: 10.6
* magnitude drop [mag]: 3.2
* estimated maximum duration [s]: 12.0
* approx. V mag of minor planet at event [mag]: 13.7
* geocentric parallax of minor planet ["]: 4.821
* apparent motion of minor planet ["/h]: 20.35
* angular distance to moon, phase of moon [deg,%]: 119, 0%
* Goffin's original chart reference: A05_1034
The occultation path with path maps:
* approximate ground width [km]: 100
* uncertainty [path widths]: 1.1
* uncertainty in time [s]: 22
* 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 Taurus, about 4.6 degrees SW of 1.7 mag star beta TAuri = SAO 77168.
!!! 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 1850-01255-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 05h 10m 20.4379s; +25d 39' 48.680"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.016", 0.025"
* V mag [mag]: 10.63 (averaged NSVS V-mag)
* B-V [mag]: +0.58 (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: 157 USNO
number of rejected observations: 0
time covered by the observations: 1998 03 03 - 2005 09 20
estimated positional 2-sigma accuracy at epoch of event ["]: 0.122", 0.046", 82 deg
remarks:
* orbital elements
Semimajor axis = 2.72150889136317
Eccentricity = 0.124372979378381
Inclination = 5.2613476635099 deg
Long. of node = 32.8580773547012 deg
Arg. of pericenter = 13.8465650322586 deg
Mean anomaly = 7.2104588470491 deg
Epoch of elements : MJD 53647.07000000 TDT (Oct 4, 2005, 1.680000 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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