IOTA/IOTA-ES occultation update for
(90) Antiope / UCAC2 21873650 = GSC 6877-00218 on September 26/27, 2005
visible from S Ireland, Great Britain, very NW France and Denmark
Summary
In the evening of night September 26/27, 2005 a faint 12.1 mag star UCAC2 21873650 = GSC 6877-00218 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 ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path for at least one component runs over S Ireland, Great Britain, very NW France and Denmark (at low altitude). 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: 21.4 mas W, 42.3 mas S
Secondary: 21.4 mas E, 42.3 mas N
and were provided by Jean Lecacheux.
Here is current station list for European cities and observatories plus other sites.
If you would like to have your station listed with other observatories and sites, send me your request using the structure descripted here
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: September 26, 2005 @ 20:24 UT (Europe)
* magnitude of target star: 12.1
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 6.5
* approx. V mag of minor planet at event [mag]: 13.5
* geocentric parallax of minor planet ["]: 3.842
* apparent motion of minor planet ["/h]: 28.15
* angular distance to moon, phase of moon [deg,%]: 173, 35%
* Goffin's original chart reference: A05_0918
The occultation path with path maps:
* approximate ground width [km]: 210
* uncertainty [path widths]: 1.30
* uncertainty in time [s]: 10
* 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 2.6 degrees NE 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 21873650 = GSC 6877-00218
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 19h 04m 29.0664s; -24d 46' 16.862"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.037" (0.025", 0.027")
* V mag [mag]: 12.11 (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 ["]: 0.056", 0.036", 87 deg
remarks:
* orbital elements
Semimajor axis = 3.15608621960161
Eccentricity = 0.155974719219839
Inclination = 2.2197690380871 deg
Long. of node = 70.2347786875211 deg
Arg. of pericenter = 242.4841475921855 deg
Mean anomaly = 355.3812111025586 deg
Epoch of elements : MJD 53639.85000000 TDT (Sep 26, 2005, 20.400000 h)
Path coordinates: click here
Calculator(s): Jan Manek
----------------------------------------------------------------------------
Jan Manek
Werichova 950
152 00 Praha 5 - Barrandov |_|_|
Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
--------------------------------------------------------------------U---U---