IOTA/IOTA-ES occultation update for
(712) Boliviana / TYC 1831-01958-1 on October 11/12, 2005
visible from N Scotland, Denmark, NE Poland, SW Belarus,
NE Ukraine and SW Russia
Summary
In the night of October 11/12, 2005 a bright 9.8 mag star TYC 1831-01958-1 will be occulted by a 132 km asteroid (712) Boliviana. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1 path width north shift with time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over N Scotland ~22:48, Denmark ~22:49.4 UT, NE Poland ~22:51.0 UT, SW Belarus ~22:51.9 UT, NE Ukraine ~22:53.5 UT and SW Russia ~22:55 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 11, 2005 @ 22:51 UT (Europe)
* magnitude of target star: 9.8
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 24.4
* approx. V mag of minor planet at event [mag]: 11.9
* geocentric parallax of minor planet ["]: 6.548
* apparent motion of minor planet ["/h]: 20.01
* angular distance to moon, phase of moon [deg,%]: 128, 63%
* Goffin's original chart reference: A05_1062
The occultation path with path maps:
* approximate ground width [km]: 135
* uncertainty [path widths]: 0.80
* uncertainty in time [s]: 20
* 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 45' ESE of 4.3 mag star tau Tauris = SAO 76721.
!!! 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 1831-01958-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 04h 45m 19.5071s; +22d 41' 14.479"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.014", 0.014"
* V mag [mag]: 9.83 (Tycho-2)
* B-V [mag]: +0.47 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (712) Boliviana
approx. diameter [km]: 132
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 160 USNO, 19 TMO
number of rejected observations: 0
time covered by the observations: 1998 02 02 - 2005 10 04
estimated positional 2-sigma accuracy at epoch of event ["]: 0.114", 0.048", 96 deg
remarks:
* orbital elements
Semimajor axis = 2.57445856821930
Eccentricity = 0.188269962862701
Inclination = 12.7812777933625 deg
Long. of node = 231.0490049933727 deg
Arg. of pericenter = 181.2033942305721 deg
Mean anomaly = 358.5009173826057 deg
Epoch of elements : MJD 53654.95000000 TDT (Oct 11, 2005, 22.800000 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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