IOTA/IOTA-ES occultation update for
(162) Laurentia / TYC 1814-01220-1 on October 31, 2005
visible from Russia, Finland, Sweden, Norway and N Scotland
Summary
In the night of October 31, 2005 a faint 11.6 mag star TYC 1814-01220-1 will be occulted by a 105 km asteroid (162) Laurentia. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~2.5 path width north shift with time ~0.5 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over Russia ~21:49-21:56 UT, Finland ~21:56.5 UT, Sweden ~21:57.3 UT, Norway ~21:57.9 UT and N Scotland ~21:59.0 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: October 31, 2005 @ 21:58 UT (Europe)
* magnitude of target star: 11.6
* magnitude drop [mag]: 2.1
* estimated maximum duration [s]: 10.6
* approx. V mag of minor planet at event [mag]: 13.5
* geocentric parallax of minor planet ["]: 4.321
* apparent motion of minor planet ["/h]: 24.19
* angular distance to moon, phase of moon [deg,%]: 140, 1%
* Goffin's original chart reference: A05_1028
The occultation path with path maps:
* approximate ground width [km]: 140
* uncertainty [path widths]: 1.0
* uncertainty in time [s]: 23
* 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 middle Taurus, about 5 degrees E of open cluster M45.
!!! 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 1814-01220-1
* constellation: TAurus
* J2000 position [h,m,s; o,',"]: 04h 09m 23.3722s; +24d 04' 21.668"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.016", 0.018"
* V mag [mag]: 11.56 (averaged NSVS V-mag)
* B-V [mag]: +0.81 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (162) Laurentia
approx. diameter [km]: 105
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 140 USNO, 16 TMO
number of rejected observations: 0
time covered by the observations: 1998 06 16 - 2005 10 10
estimated positional 2-sigma accuracy at epoch of event ["]: 0.146", 0.042", 75 deg
remarks:
* orbital elements
Semimajor axis = 3.02620793233101
Eccentricity = 0.172997377335943
Inclination = 6.0846495717841 deg
Long. of node = 36.4551949914362 deg
Arg. of pericenter = 112.2974122725508 deg
Mean anomaly = 287.4721181848639 deg
Epoch of elements : MJD 53674.92000000 TDT (Oct 31, 2005, 22.080000 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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