IOTA/IOTA-ES occultation update for
(5) Astraea / TYC 6336-01723-1 on October 10/11, 2005
visible from N Africa, S Italy and Albania at low altitude
Summary
In the night of October 10/11, 2005 a faint 10.4 mag star TYC 6336-01723-1 will be occulted by a 125 km asteroid (5) Astraea. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows no path shift with time ~0.8 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over N Africa ~21:32 UT, S Italy ~21:33.8 UT and Albania ~21:34.0 UT at low altitude. Please check the path chart for details.
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The event at one glimpse:
* date and approx. UT time of event: October 10, 2005 @ 21:34 UT (Europe)
* magnitude of target star: 10.4
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 18.0
* approx. V mag of minor planet at event [mag]: 12.4
* geocentric parallax of minor planet ["]: 3.327
* apparent motion of minor planet ["/h]: 13.03
* angular distance to moon, phase of moon [deg,%]: 15, 51%
* Goffin's original chart reference: A05_1002
The occultation path with path maps:
* approximate ground width [km]: 190
* uncertainty [path widths]: 0.77
* uncertainty in time [s]: 16
* 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 west Capricornus, about 48' ESE of 5.2 mag star sigma Capricorni = SAO 163445.
!!! 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 6336-01723-1
* constellation: ACapricornus
* J2000 position [h,m,s; o,',"]: 20h 22m 33.1273s; -19d 23' 56.436"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.020", 0.019"
* V mag [mag]: 10.43 (averaged ASAS3 V-mag)
* B-V [mag]: +1.21 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (5) Astraea
approx. diameter [km]: 125
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 176 USNO, 46 TMO
number of rejected observations: 0
time covered by the observations: 1997 05 31 - 2005 08 30
estimated positional 2-sigma accuracy at epoch of event ["]: 0.038", 0.032", 85 deg
remarks:
* orbital elements
Semimajor axis = 2.57313800698401
Eccentricity = 0.192929032151405
Inclination = 5.3692667836527 deg
Long. of node = 141.6900699813198 deg
Arg. of pericenter = 357.5322212999941 deg
Mean anomaly = 183.4308294821346 deg
Epoch of elements : MJD 53653.90000000 TDT (Oct 10, 2005, 21.600000 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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