IOTA/IOTA-ES occultation update for
(30) Urania / TYC 1900-00951-1 on November 1/2, 2004
visible from England, N Netherlands, N Germany, N Poland,
Lithuania, N Belarus, Russia and N Khazachstan
Summary
In the night of November 1/2, 2004 a faint 11.0 mag star TYC 1900-00951-1 will be occulted by a 104 km asteroid (30) Urania. This update is based on USNO/Flagstaff, TMO and HIP/Tycho astrometry for the asteroid and UCAC2 star position.
The updated path shows ~0.5 path width N shift with no time shift compared to Edwin Goffin's nominal prediction.
Updated path runs over England ~1:14.0 UT, N Netherlands ~1:15.0 UT, N Germany ~1:15.9 UT, N Poland ~1:17.0 UT, Lithuania ~1:18.1 UT, N Belarus ~1:18.9 UT, Russia ~1:20-1:25 UT and N Khazachstan around 1:27 UT. Please check the path chart for details.
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Event has only 0.9 mag drop expected, so it will not be an easy event for visual observers. Moreover the almost full Moon will be only ~12 degrees WNW of target making location harder than usual.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: November 2, 2004 @ 01:16 UT (Europe)
* magnitude of target star: 11.0
* magnitude drop [mag]: 0.9
* estimated maximum duration [s]: 16.8
* approx. V mag of minor planet at event [mag]: 11.3
* geocentric parallax of minor planet ["]: 5.677
* apparent motion of minor planet ["/h]: 19.80
* angular distance to moon, phase of moon [deg,%]: 12, 78%
* Goffin's original chart reference: A04_1104
The occultation path with path maps:
* approximate ground width [km]: 120
* uncertainty [path widths]: 0.6
* uncertainty in time [s]: 16
* 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 Gemini, about 3.0 degrees NW of 3.5 mag star delta Geminorum = SAO 79294.
!!! 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 1900-00951-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 07h 13m 36.4060s; +24d 28' 53.091"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.026" (0.015", 0.019")
* V mag [mag]: 11.00
* B-V [mag]: +0.39
* remarks:
Data for the minor planet:
* general information:
number, name: (30) Urania
approx. diameter [km]: 104
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), HIPPARCOS
number of used observations: 108 USNO, 10 TMO, 49 HIP
number of rejected observations: 0
time covered by the observations: 1989 11 29 - 2004 10 23
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.08", 0.04"
remarks:
* orbital elements
Semimajor axis = 2.36539664328784 AU
Eccentricity = 0.126957078532489
Inclination = 2.0982308834356 deg
Long. of node = 307.9260005986475 deg
Arg. of pericenter = 86.1399273210891 deg
Mean anomaly = 37.3838411100544 deg
Epoch of elements : MJD 53311.05000000 TDT (Nov 2, 2004, 1.200000 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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