IOTA/IOTA-ES occultation update for
(275) Sapientia / TYC 6270-02159-1 on May 2/3, 2004
visible from N Egypt, Crete, Greece, Albania, Croatia,
Slovenia, Austria, Germany and N Netherlands
Summary
In the night of May 2/3, 2004 a faint 10.9 mag star TYC 6270-02159-1 will be occulted by a 103 km asteroid (275) Sapientia. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows ~3.5 path width east shift with time ~17 minutes later compared to Edwin Goffin's nominal prediction.
Updated path runs over N Egypt ~1:14 UT, Crete ~1:21 UT, Greece ~1:25 UT, Albania ~1:28 UT, Croatia ~1:32 UT, Slovenia ~1:34 UT, Austria ~1:35 UT, Germany from SE to NW ~1:36 UT to 1:39 UT and N Netherlands ~1:40 UT. Please check the path chart for details.
Please note that occultation takes place near asteroid's stationary point - the geocentric angular motion is only 2.30"/hour. Therefore the occultation lasts for almost 2 minutes ! I would recommend monitoring the occultation in whole Europe to cover densely also nearby space around asteroid for any possible small body. Please monitor at least 8 minutes around time of closest approach to your site.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: May 3, 2004 @ 01:35 UT (Europe)
* magnitude of target star: 10.9
* magnitude drop [mag]: 2.6
* estimated maximum duration [s]: 113
* approx. V mag of minor planet at event [mag]: 13.4
* geocentric parallax of minor planet ["]: 4.466
* apparent motion of minor planet ["/h]: 2.30
* angular distance to moon, phase of moon [deg,%]: 79, 95%
* Goffin's original chart reference: A04_0523
The occultation path with path maps:
* approximate ground width [km]: 180
* uncertainty [path widths]: 1.1
* uncertainty in time [s]: 140 (= 2minutes 20 seconds !)
* 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 north Sagittarius, about 3.3 degrees south of 4.7 mag star gamma Scuti = SAO 161520
or about 1.3 degrees NNW of open cluster M25.
!!! 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 6270-02159-1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 18h 29m 58.4693s; -17o 55' 25.390"
* position source: UCAC2
* estimated accuracy ["]: 0.04" (0.03", 0.03")
* V mag [mag]: 10.98
* B-V [mag]: +2.00
* remarks:
Data for the minor planet:
* general information:
number, name: (275) Sapientia
approx. diameter [km]: 103
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 111 USNO, 21 TMO
number of rejected observations: 0
time covered by the observations: 1997 11 29 - 2003 04 15
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.08", 0.04"
remarks:
Path coordinates: click here
Calculator(s): Jan Manek
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Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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