IOTA/IOTA-ES occultation update for
(598) Octavia / TYC 1353-01233-1 on October 2/3, 2005
visible from NW Africa, NW Crete and S Turkey
Summary
In the morning of night October 2/3, 2005 a faint 10.8 mag star TYC 1353-01233-1 will be occulted by a 75 km asteroid (598) Octavia. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~0.5 path width south shift with time ~0.1 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over NW Africa 3:05-3:07 UT, NW Crete ~3:07.7 UT and S Turkey ~3:08.5 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 03, 2005 @ 03:08 UT (Europe)
* magnitude of target star: 10.8
* magnitude drop [mag]: 3.6
* estimated maximum duration [s]: 3.7
* approx. V mag of minor planet at event [mag]: 14.4
* geocentric parallax of minor planet ["]: 4.053
* apparent motion of minor planet ["/h]: 45.76
* angular distance to moon, phase of moon [deg,%]: 80, 0%
* Goffin's original chart reference: A05_1057
The occultation path with path maps:
* approximate ground width [km]: 270
* uncertainty [path widths]: 1.2
* uncertainty in time [s]: 13
* 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 Gemini, about 1.7 degrees ESE of 4.0 mag star zeta Geminorum = SAO 79031.
!!! 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 1353-01233-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 07h 10m 51.7953s; +19d 54' 03.091"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.016", 0.016"
* V mag [mag]: 10.80 (averaged NSVS V-mag)
* B-V [mag]: +0.66 (Tycho-2)
* remarks:
Data for the minor planet:
* general information:
number, name: (598) Octavia
approx. diameter [km]: 75
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 127 USNO
number of rejected observations: 0
time covered by the observations: 1998 02 26 - 2004 10 16
estimated positional 2-sigma accuracy at epoch of event ["]: 0.154", 0.044", 82 deg
remarks:
* orbital elements
Semimajor axis = 2.76058058622459
Eccentricity = 0.249561326606370
Inclination = 12.2358472366682 deg
Long. of node = 91.9235952545695 deg
Arg. of pericenter = 291.3184635254821 deg
Mean anomaly = 35.6282615470007 deg
Epoch of elements : MJD 53646.13000000 TDT (Oct 3, 2005, 3.120000 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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