IOTA/IOTA-ES occultation update for
(100) Hekate / TYC 0649-00346-1 on October 12/13, 2005
visible from Russia, SE Belarus, NW Ukraine, SE Poland, Slovakia,
SE Austria, NW Slovenia, N Italy, SE France and Spain
Summary
In the night of October 12/13, 2005 a faint 10.9 mag star TYC 0649-00346-1 will be occulted by a 92 km asteroid (100) Hekate. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1.0 path width north shift with time ~0.3 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over Russia ~0:27-0:30 UT, SE Belarus ~0:30.5 UT, NW Ukraine ~0:30.9 UT, SE Poland ~0:31.3 UT, Slovakia ~0:31.7 UT, SE Austria ~0:32.2 UT, NW Slovenia ~0:32.4 UT, N Italy ~0:33.0 UT, SE France ~0:33.5 UT and Spain ~0:35.0 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 13, 2005 @ 00:32 UT (Europe)
* magnitude of target star: 10.9
* magnitude drop [mag]: 1.6
* estimated maximum duration [s]: 9.5
* approx. V mag of minor planet at event [mag]: 12.2
* geocentric parallax of minor planet ["]: 4.222
* apparent motion of minor planet ["/h]: 22.98
* angular distance to moon, phase of moon [deg,%]: 89, 75%
* Goffin's original chart reference: A05_1021
The occultation path with path maps:
* approximate ground width [km]: 120
* uncertainty [path widths]: 1.1
* uncertainty in time [s]: 17
* 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 W Cetus, about 1.5 degrees W of 3.6 mag star omicron Tauri = SAO 111172.
!!! 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 0649-00346-1
* constellation: Cetus
* J2000 position [h,m,s; o,',"]: 03h 18m 44.7195s; +08d 45' 13.004"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.019", 0.025"
* V mag [mag]: 10.90 (averaged ASAS3 V-mag)
* B-V [mag]: +1.17 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (100) Hekate
approx. diameter [km]: 92
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 174 USNO
number of rejected observations: 0
time covered by the observations: 1998 03 01 - 2005 09 25
estimated positional 2-sigma accuracy at epoch of event ["]: 0.090", 0.042", 72 deg
remarks:
* orbital elements
Semimajor axis = 3.09380061427824
Eccentricity = 0.164897074162232
Inclination = 6.4295095747951 deg
Long. of node = 127.3447792361536 deg
Arg. of pericenter = 185.9085526106437 deg
Mean anomaly = 68.0402351857218 deg
Epoch of elements : MJD 53656.02000000 TDT (Oct 13, 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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