IOTA/IOTA-ES occultation update for
(335) Roberta / TYC 4967-00483-1 on May 4/5, 2004
visible from Asia, S Russia, NE Ukraine, Belarus, Latvia, S Sweden and S Norway
Summary
In the night of May 4/5, 2004 a faint 10.7 mag star TYC 4967-00483-1 will be occulted by a 94 km asteroid (335) Roberta. 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 north shift with time ~0.2 minutes later compared to Edwin Goffin's nominal prediction.
Updated path runs over Asia, S Russia ~20:42.1 UT, NE Ukraine ~20:43.5 UT, Belarus ~20:44.5 UT, Latvia ~20:45.0 UT, S Sweden ~20:46.0 UT and S Norway ~20:46.6 UT in strong twilight. Please check the path chart for details.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: May 4, 2004 @ 20:45 UT (Europe)
* magnitude of target star: 10.7
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 10.9
* approx. V mag of minor planet at event [mag]: 12.1
* geocentric parallax of minor planet ["]: 6.667
* apparent motion of minor planet ["/h]: 32.33
* angular distance to moon, phase of moon [deg,%]: 21, 100%
* Goffin's original chart reference: A04_0527
The occultation path with path maps:
* approximate ground width [km]: 140
* uncertainty [path widths]: 0.5
* uncertainty in time [s]: 10
* 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 Virgo, about 3.5 degrees SE of 3.4 mag star zeta Virginis = SAO 139420.
!!! 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 4967-00483-1
* constellation: Virgo
* J2000 position [h,m,s; o,',"]: 13h 46m 45.8337s; -02o 23' 35.367"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 10.68
* B-V [mag]: +0.46
* remarks:
Data for the minor planet:
* general information:
number, name: (335) Roberta
approx. diameter [km]: 94
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 124 USNO, 25 TMO
number of rejected observations: 0
time covered by the observations: 1997 09 23 - 2004 03 29
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.08", 0.05"
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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