IOTA/IOTA-ES occultation update for
(640) Brambilla / TYC 1308-00634-1 on September 7/8, 2004
visible from Portugal, Spain, N Sardinia, S Italy,
Albania, N Greece and NW Turkey
Summary
In the night of September 7/8, 2004 a faint 10.2 mag star TYC 1308-00634-1 will be occulted by a 85 km asteroid (640) Brambilla. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows large ~8 path width south shift with no time correction compared to Edwin Goffin's nominal prediction.
Updated path runs over middle Portugal ~3:09.1 UT, middle Spain ~3:09.3 UT with Madrid just north of N limit, N Sardinia ~3:10.2 UT, S Italy ~3:10.7 UT with Naples in path, Albania ~3:11.0 UT, N Greece 3:11.3 UT and NW Turkey ~3:11.7 UT. 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: September 08, 2004 @ 03:10 UT (Europe)
* magnitude of target star: 10.2
* magnitude drop [mag]: 5.2
* estimated maximum duration [s]: 5.0
* approx. V mag of minor planet at event [mag]: 15.4
* geocentric parallax of minor planet ["]: 2.649
* apparent motion of minor planet ["/h]: 25.61
* angular distance to moon, phase of moon [deg,%]: 13, 36%
* Goffin's original chart reference: A04_0935
The occultation path with path maps:
* approximate ground width [km]: 90
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 14
* 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 east Taurus, about 4.0 degrees west of 3.0 mag star zeta Tauri = SAO 77336.
!!! 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 1308-00634-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 05h 20m 36.2766s; +21o 04' 42.180"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 10.19
* B-V [mag]: +0.52
* remarks:
Data for the minor planet:
* general information:
number, name: (640) Brambilla
approx. diameter [km]: 85
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 152 USNO, 9 TMO
number of rejected observations: 0
time covered by the observations: 1998 09 18 - 2003 12 29
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.09", 0.05"
remarks:
* orbital elements
Semimajor axis = 3.15832503645832 AU
Eccentricity = 0.080718848329272
Inclination = 13.3881194864579 deg
Long. of node = 235.0686120378541 deg
Arg. of pericenter = 35.0007348129464 deg
Mean anomaly = 149.3778717808116 deg
Epoch of elements : MJD 53256.13000000 TDT (Sep 8, 2004, 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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