IOTA/IOTA-ES occultation update for
(402) Chloe / TYC 0771-01046-1 on October 23/24, 2004
visible from N Scotland, S Norway, S Sweden, N Latvia,
S Estonia and Russia
Summary
In the night of October 23/24, 2004 a faint 12.1 mag star TYC 0771-01046-1 will be occulted by a 58 km asteroid (402) Chloe. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows ~3 path width N shift with time ~0.4 minute earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over N Scotland ~1:09.0 UT, S Norway ~1:09.7 UT, S Sweden ~1:10.1 UT, N Latvia ~1:10.7 UT, S Estonia ~1:10.8 UT and Russia ~1:11.0->1:14.0 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 14, 2004 @ 01:11 UT (Europe)
* magnitude of target star: 12.1
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 4.9
* approx. V mag of minor planet at event [mag]: 13.6
* geocentric parallax of minor planet ["]: 4.393
* apparent motion of minor planet ["/h]: 29.38
* angular distance to moon, phase of moon [deg,%]: 126, 82%
* Goffin's original chart reference: A04_1024
The occultation path with path maps:
* approximate ground width [km]: 80
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 12
* 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 N Canis Minor, about 4.5 degrees NW of 2.9 mag star beta Canis Minoris = SAO 115456
or 42' east of 5.7 mag star SAO 96672.
!!! 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 0771-01046-1
* constellation: Canis Minor
* J2000 position [h,m,s; o,',"]: 07h 17m 26.5866s; +12o 06' 08.701"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.023" (0.016", 0.017")
* V mag [mag]: 12.12
* B-V [mag]: +0.10
* remarks:
Data for the minor planet:
* general information:
number, name: (402) Chloe
approx. diameter [km]: 58
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 129 USNO, 8 TMO
number of rejected observations: 0
time covered by the observations: 1998 04 25 - 2004 10 14
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.08", 0.04"
remarks:
* orbital elements
Semimajor axis = 2.55835280477940 AU
Eccentricity = 0.111948187200593
Inclination = 11.8208103569643 deg
Long. of node = 129.5945200547219 deg
Arg. of pericenter = 18.2824392635104 deg
Mean anomaly = 307.6171417605788 deg
Epoch of elements : MJD 53302.05000000 TDT (Oct 24, 2004, 1.200000 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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