IOTA/IOTA-ES occultation update for
(206) Hersilia / UCAC2 23687129 = GSC 6257-00313 on September 01/02, 2005
visible from Netherlands, N Germany, Czech Republic, SW Poland, Slovakia,
NE Hungary, S Ukraine, NE Romania, Moldova and S Russia
Summary
In the evening of night September 01/02, 2005 a faint 12.3 mag star UCAC2 23687129 = GSC 6257-00313 will be occulted by a 61 km asteroid (206) Hersilia. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~0.5 path width north shift with time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over Netherlands ~19:35.4 UT, N Germany ~19:36.0 UT, Czech Republic ~19:37.0 UT, SW Poland ~19:37.3 UT, Slovakia ~19:37.7 UT, NE Hungary ~19:38.0 UT, S Ukraine ~19:39.0 UT, NE Romania ~19:28.8 UT, Moldova ~19:39.1 UT and S Russia ~19:40.6 UT at very low altitudes. Please check the path chart for details.
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The event at one glimpse:
* date and approx. UT time of event: September 01, 2005 @ 19:37 UT (Europe)
* magnitude of target star: 12.3
* magnitude drop [mag]: 1.8
* estimated maximum duration [s]: 7.7
* approx. V mag of minor planet at event [mag]: 13.9
* geocentric parallax of minor planet ["]: 3.707
* apparent motion of minor planet ["/h]: 16.53
* angular distance to moon, phase of moon [deg,%]: 128, 4%
* Goffin's original chart reference: A05_0929
The occultation path with path maps:
* approximate ground width [km]: 210
* uncertainty [path widths]: 1.9
* 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 NE Sagittarius, about 1.4 degrees NW of 4.9 mag star 58 Ophiuchi = SAO 185660.
!!! 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: UCAC2 23687129 = GSC 6257-00313
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 17h 47m 18.4465s; -20d 34' 58.494"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.032" (0.020", 0.025")
* V mag [mag]: 12.3 (corrected ASAS3 V-mag)
* B-V [mag]: +0.4 (estimate)
* remarks:
Data for the minor planet:
* general information:
number, name: (206) Hersilia
approx. diameter [km]: 61
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 135 USNO
number of rejected observations: 0
time covered by the observations: 1998 11 06 - 2005 08 17
estimated positional 2-sigma accuracy at epoch of event ["]: 0.064", 0.0036, 93 deg
remarks:
* orbital elements
Semimajor axis = 2.73966686712890
Eccentricity = 0.040927388165620
Inclination = 3.7806371106868 deg
Long. of node = 145.2804929205061 deg
Arg. of pericenter = 302.4216928379203 deg
Mean anomaly = 200.6120038597478 deg
Epoch of elements : MJD 53614.82000000 TDT (Sep 1, 2005, 19.680000 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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