IOTA/IOTA-ES occultation update for
(1712) Angola / TYC 2251-00099-1 on August 14/15, 2004
visible from S Norway in strong twilight, S Iceland, S Greenland and Canada
Summary
In the night of August 14/15, 2004 a bright 9.5 mag star TYC 2251-00099-1 will be occulted by a 66 km asteroid (1712) Angola. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path shows large ~11 path width north shift with time ~3.0 minutes earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over S Norway in strong twilight ~3:39.2 UT, S Iceland ~3:42.5 UT, S Greenland ~3:45 UT and Canada. 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: August 15, 2004 @ 03:39 UT (Europe)
* magnitude of target star: 9.5
* magnitude drop [mag]: 5.9
* estimated maximum duration [s]: 8.7
* approx. V mag of minor planet at event [mag]: 15.4
* geocentric parallax of minor planet ["]: 3.707
* apparent motion of minor planet ["/h]: 15.88
* angular distance to moon, phase of moon [deg,%]: 121, 1%
* Goffin's original chart reference: A04_0834
The occultation path with path maps:
* approximate ground width [km]: 85
* uncertainty [path widths]: 1.6
* uncertainty in time [s]: 21
* 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 Pegasus, about 8.5 degrees SW of 2.0 mag star alpha Andromedae = SAO 73765.
!!! 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 2251-00099-1
* constellation: Pegasus
* J2000 position [h,m,s; o,',"]: 23h 38m 25.4542s; +23o 48' 18.551"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 9.50
* B-V [mag]: +1.47
* remarks:
Data for the minor planet:
* general information:
number, name: (1712) Angola
approx. diameter [km]: 66
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 116 USNO, 16 TMO
number of rejected observations: 0
time covered by the observations: 1998 07 08 - 2004 08 05
rms residuals ["] (RA,DE): 0.08", 0.06"
estimated positional accuracy at epoch of event ["]: 0.08", 0.05"
remarks:
* orbital elements
Semimajor axis = 3.17549357575608 AU
Eccentricity = 0.145511488302468
Inclination = 19.3284705283524 deg
Long. of node = 237.8963860887984 deg
Arg. of pericenter = 18.2253179551130 deg
Mean anomaly = 77.8693299718970 deg
Epoch of elements : MJD 53232.15000000 TDT (Aug 15, 2004, 3.600000 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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