IOTA/IOTA-ES occultation update for
(85) Io / TYC 0144-01868-1 on December 12/13, 2004
visible from Siberia, Russia, N Ukraine, Slovakia, Hungary, Austria,
Slovenia, N Italy, S Switzerland, S France, NW Spain and N Portugal
Summary
In the night of December 12/13, 2004 a faint 11.4 mag star TYC 0144-01868-1 will be occulted by a 178 km asteroid (85) Io. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1.0 path width N shift with no time shift compared to Edwin Goffin's nominal prediction.
Updated path runs over Siberia ~21:58->21:01 UT, Russia ~21:03 UT, N Ukraine ~21:04.1 UT, Slovakia ~21:05.0 UT, Hungary ~21:05.1 UT, Austria ~21:05.5 UT, Slovenia ~21:05.6 UT, N Italy ~21:05.8 UT, S Switzerland ~21:05.9 UT, S France ~21:06.5 UT, NW Spain ~21:07.0 UT and N Portugal ~21:07.2 UT. Please check the path chart for details.
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The event at one glimpse:
* date and approx. UT time of event: December 12, 2004 @ 21:06 UT (Europe)
* magnitude of target star: 11.4
* magnitude drop [mag]: 1.1
* estimated maximum duration [s]: 13.2
* approx. V mag of minor planet at event [mag]: 12.0
* geocentric parallax of minor planet ["]: 4.568
* apparent motion of minor planet ["/h]: 34.77
* angular distance to moon, phase of moon [deg,%]: 159, 1%
* Goffin's original chart reference: A04_1219
The occultation path with path maps:
* approximate ground width [km]: 260
* uncertainty [path widths]: 0.48
* uncertainty in time [s]: 10
* map: Overview
Asian part
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 E Orion, about 5.3 degrees E of 0.6 mag star alpha Orionis = Betelgeuse = SAO 113271.
!!! 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 0144-01868-1
* constellation: Orion
* J2000 position [h,m,s; o,',"]: 06h 16m 33.0783s; +06d 54' 08.299"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.024" (0.018", 0.017")
* R mag [mag]: 11.41
* B-V [mag]: +0.40
* remarks:
Data for the minor planet:
* general information:
number, name: (85) Io
approx. diameter [km]: 178
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 168 USNO, 28 TMO
number of rejected observations: 0
time covered by the observations: 1995 11 11 - 2004 12 02
rms residuals ["] (RA,DE): 0.14", 0.12"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.07", 0.04"
remarks:
* orbital elements
Semimajor axis = 2.65267665907742 AU
Eccentricity = 0.192866694085253
Inclination = 11.9665742162799 deg
Long. of node = 203.4439801884983 deg
Arg. of pericenter = 122.3625508283058 deg
Mean anomaly = 104.6116551279835 deg
Epoch of elements : MJD 53351.88000000 TDT (Dec 12, 2004, 21.120000 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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