IOTA/IOTA-ES occultation update for
(90) Antiope / UCAC2 21638930 = GSC 6864-00102 on September 15/16, 2005
visible from south Europe and NW Africa
Summary
In the evening of night September 15/16, 2005 a faint 12.3 mag star UCAC2 21638930 = GSC 6864-00102 will be occulted by a 85 km asteroid (90) Antiope. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows for the photocenter no shift with time ~0.1 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path for at least one component runs over N Algeria, N Tunis, Sicily, S Italy, Greece, Albania, Bulgaria, S Romania, S Ukraine and S Russia. Please check the path chart for details.
I have used the model where both components have 85km diameter, and predicted offsets from mass center (photocenter) are:
Primary: 27.7 mas W, 45.1 mas S
Secondary: 27.7 mas E, 45.1 mas N
and were provided by Jean Lecacheux.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: September 15, 2005 @ 18:27 UT (Europe)
* magnitude of target star: 11.9
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 10.0
* approx. V mag of minor planet at event [mag]: 13.9
* geocentric parallax of minor planet ["]: 4.085
* apparent motion of minor planet ["/h]: 19.66
* angular distance to moon, phase of moon [deg,%]: 38, 92%
* Goffin's original chart reference: A05_0917
The occultation path with path maps:
* approximate ground width [km]: 175
* uncertainty [path widths]: 1.45
* 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 middle Sagittarius, about 1.3 degrees NNE of 2.0 mag star sigma Sagittarii = SAO 187448.
!!! 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 21638930 = GSC 6864-00102
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 18h 56m 44.7383s; -25d 01' 05.913"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.047" (0.034", 0.034")
* V mag [mag]: 11.85 (ASAS3 V-mag)
* B-V [mag]: ?.?
* remarks:
Data for the minor planet:
* general information:
number, name: (90) Antiope
approx. diameter [km]: 85+85
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 181 USNO, 6 TMO
number of rejected observations: 0
time covered by the observations: 1998 02 05 - 2005 08 19
estimated positional 2-sigma accuracy at epoch of event ["]: 0.060", 0.0036, 88 deg
remarks:
* orbital elements
Semimajor axis = 3.15605415745243
Eccentricity = 0.155965747161497
Inclination = 2.2197690746032 deg
Long. of node = 70.2347807099582 deg
Arg. of pericenter = 242.4828495506424 deg
Mean anomaly = 353.4343292580085 deg
Epoch of elements : MJD 53628.77000000 TDT (Sep 15, 2005, 18.480000 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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