IOTA/IOTA-ES occultation update for
(638) Moira / TYC 1286-00191-1 = SAO 94339 on September 15/16, 2004
visible from S Ireland, England, N Netherlands and N Germany in twilight
Summary
In the night of September 15/16, 2004 a bright 8.8 mag star TYC 1286-00191-1 = SAO 94339 will be occulted by a 68 km asteroid (638) Moira. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.
The updated path shows small ~1 path width north shift with time ~0.2 minute later compared to Edwin Goffin's nominal prediction.
Updated path runs over S Ireland ~4:30.0 UT, England ~4:30.6 UT, N Netherlands ~4:31.5 UT and N Germany in twilight around 4:31.9 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 16, 2004 @ 04:31 UT (Europe)
* magnitude of target star: 8.8
* magnitude drop [mag]: 7.1
* estimated maximum duration [s]: 6.2
* approx. V mag of minor planet at event [mag]: 15.9
* geocentric parallax of minor planet ["]: 3.025
* apparent motion of minor planet ["/h]: 18.71
* angular distance to moon, phase of moon [deg,%]: 116, 3%
* Goffin's original chart reference: A04_0934
The occultation path with path maps:
* approximate ground width [km]: 85
* uncertainty [path widths]: 1.6
* 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 south Taurus, about 7.7 degrees east of 1.0 mag star alpha Tauri = SAO 94027 = Aldebaran.
!!! 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 1286-00191-1 = SAO 94339 = PPM 120631
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 05h 07m 58.1262s; +16o 58' 47.087"
* position source: Tycho-2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 8.79
* B-V [mag]: +0.35
* remarks:
Data for the minor planet:
* general information:
number, name: (638) Moira
approx. diameter [km]: 68
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 132 USNO, 14 TMO
number of rejected observations: 0
time covered by the observations: 1998 06 26 - 2003 12 22
rms residuals ["] (RA,DE): 0.14", 0.14"
estimated positional accuracy at epoch of event ["]: 0.07", 0.03"
remarks:
* orbital elements
Semimajor axis = 2.73296810876465 AU
Eccentricity = 0.162708761011540
Inclination = 7.7154055319074 deg
Long. of node = 103.2782419238697 deg
Arg. of pericenter = 129.0455491476449 deg
Mean anomaly = 188.8662323217737 deg
Epoch of elements : MJD 53264.19000000 TDT (Sep 16, 2004, 4.560000 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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