IOTA/IOTA-ES occultation update for
(420) Bertholda / UCAC2 39459745 = GSC 1327-00953 on September 19/20, 2005
visible from NW Spain, S France, S Switzerland, N Italy, S Austria,
Slovania, Hungary, N Romania, Moldova, S Ukraine and S Russia
Summary
In the morning of night September 19/20, 2005 a faint 12.3 mag star UCAC2 39459745 = GSC 1327-00953 will be occulted by a 146 km asteroid (420) Bertholda. This update is based on USNO/Flagstaff, TMO, Ondrejov, LaSilla nad Geneva astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1 path width north shift with time ~0.3 minutes later compared to Edwin Goffin's nominal prediction.
Updated path runs over NW Spain ~2:36.5 UT, S France ~2:36.9 UT, S Switzerland ~2:37.1 UT, N Italy ~2:37.2 UT, S Austria ~2:37.4 UT, Slovenia ~2:37.5 UT, Hungary ~2:37.6 UT, N Romania ~2:38.0 UT, Moldova ~2:38.2 UT, S Ukraine ~2:38.5 UT and S Russia ~2:39.1 UT in strong twilight. Please check the path chart for details.
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The event at one glimpse:
* date and approx. UT time of event: September 20, 2005 @ 02:37 UT (Europe)
* magnitude of target star: 12.3
* magnitude drop [mag]: 2.3
* estimated maximum duration [s]: 7.4
* approx. V mag of minor planet at event [mag]: 14.5
* geocentric parallax of minor planet ["]: 2.689
* apparent motion of minor planet ["/h]: 29.97
* angular distance to moon, phase of moon [deg,%]: 71, 94%
* Goffin's original chart reference: A05_0938
The occultation path with path maps:
* approximate ground width [km]: 160
* uncertainty [path widths]: 1.0
* uncertainty in time [s]: 18
* 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 W Gemini, about 0.8 degrees SSW of 2.9 mag star mu Geminorum = SAO 78297.
!!! 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: UCAC2 39459745 = GSC 1327-00953
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 06h 21m 49.1087s; +21d 45' 21.565"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.033" (0.018", 0.028")
* V mag [mag]: 12.3 (averaged ASAS3 V-mag)
* B-V [mag]: +?.?
* remarks:
Data for the minor planet:
* general information:
number, name: (420) Bertholda
approx. diameter [km]: 146
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), Ondrejov, LaSilla+Geneva (R.Behrend)
number of used observations: 167 USNO, 3 Ondrejov, 3 LaSilla, 19 Geneva
number of rejected observations: 0
time covered by the observations: 1998 08 26 - 2004 12 26
estimated positional 2-sigma accuracy at epoch of event ["]: 0.140", 0.032", 97 deg
remarks:
* orbital elements
Semimajor axis = 3.41338764870450
Eccentricity = 0.043038909614518
Inclination = 6.6601161306802 deg
Long. of node = 243.7801297683838 deg
Arg. of pericenter = 224.5399334475986 deg
Mean anomaly = 331.6656364071808 deg
Epoch of elements : MJD 53633.11000000 TDT (Sep 20, 2005, 2.640000 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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