IOTA/IOTA-ES occultation update for
(636) Erika / TYC 1224-00281-1 on October 14/15, 2004
visible from Russia, S Estonia, N Latvia, S Sweden, N Denmark,
Scotland and N Ireland
Summary
In the night of October 14/15, 2004 a faint 10.8 mag star TYC 1224-00281-1 will be occulted by a 78 km asteroid (636) Erika. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1 path width N shift with time ~0.3 minute earlier compared to Edwin Goffin's nominal prediction.
Updated path runs over Russia from Siberia to Europe at 23:02-23:08 UT, S Estonia ~23:08.7 UT, N Latvia ~23:08.8 UT, S Sweden ~23:09.8 UT, N Denmark ~23:10.3 UT, Scotland ~23:11.6 UT and N Ireland ~23:12.0 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: October 14, 2004 @ 23:10 UT (Europe)
* magnitude of target star: 10.8
* magnitude drop [mag]: 2.7
* estimated maximum duration [s]: 8.0
* approx. V mag of minor planet at event [mag]: 13.4
* geocentric parallax of minor planet ["]: 5.260
* apparent motion of minor planet ["/h]: 28.79
* angular distance to moon, phase of moon [deg,%]: 167, 1%
* Goffin's original chart reference: A04_1033
The occultation path with path maps:
* approximate ground width [km]: 105
* uncertainty [path widths]: 1.25
* uncertainty in time [s]: 10
* map: Overview
Asian part
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 SE Aries, about 12 degrees ESE of 2.0 mag star alpha Arietis = SAO 75151 = Hamal
or 47' SSE od 5.3 mag star pi Arietis = SAO 93127.
!!! 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 1224-00281-1
* constellation: Aries
* J2000 position [h,m,s; o,',"]: 02h 51m 00.8178s; +16o 48' 45.298"
* position source: UCAC2
* estimated 1-sigma accuracy ["]: 0.026" (0.017", 0.020")
* V mag [mag]: 10.83
* B-V [mag]: +1.22
* remarks:
Data for the minor planet:
* general information:
number, name: (636) Erika
approx. diameter [km]: 78
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 156 USNO
number of rejected observations: 0
time covered by the observations: 1998 04 09 - 2004 10 03
rms residuals ["] (RA,DE): 0.15", 0.15"
estimated positional 2-sigma accuracy at epoch of event ["]: 0.14", 0.05"
remarks:
* orbital elements
Semimajor axis = 2.90851834244459 AU
Eccentricity = 0.175013356926157
Inclination = 7.9331404706977 deg
Long. of node = 34.8001458617685 deg
Arg. of pericenter = 298.1501082321064 deg
Mean anomaly = 46.7708952853638 deg
Epoch of elements : MJD 53292.97000000 TDT (Oct 14, 2004, 23.280000 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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