IOTA/IOTA-ES occultation update for
(88) Thisbe / TYC 6276-01497-1 on September 28/29, 2004
visible from N England and Scotland in strong twilight, N Denmark,
S Norway and S Sweden at low altitudes
Summary
In the night of September 28/29, 2004 a faint 10.3 mag star TYC 6276-01497-1 will be occulted by a 232 km asteroid (88) Thisbe. This update is based on USNO/Flagstaff, TMO and Hipparcos astrometry for the asteroid and UCAC2 star position.
The updated path shows no path shift with time ~0.2 minute later compared to Edwin Goffin's nominal prediction.
Updated path runs over N England and Scotland in strong twilight ~17:55.6 UT, N Denmark ~17:56.3 UT, S Norway ~17:56.2 UT and S Sweden ~17:56.4 UT at low altitudes. Please check the path chart for details.
Here is current station list for European cities and observatories plus other sites.
If you would like to have your station listed with other observatories and sites, send me your request using the structure descripted here
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: September 28, 2004 @ 17:56 UT (Europe)
* magnitude of target star: 10.3
* magnitude drop [mag]: 1.8
* estimated maximum duration [s]: 11.2
* approx. V mag of minor planet at event [mag]: 11.9
* geocentric parallax of minor planet ["]: 4.083
* apparent motion of minor planet ["/h]: 47.76
* angular distance to moon, phase of moon [deg,%]: 96, 100%
* Goffin's original chart reference: A04_0909
The occultation path with path maps:
* approximate ground width [km]: 1000
* uncertainty [path widths]: 0.19
* uncertainty in time [s]: 3
* 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 NW Sagittarius, about 0.6 degrees SW of 3.8 mag star mu Sagittarii = SAO 186497.
!!! 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 6276-01497-1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 18h 11m 29.3016s; -21o 21' 17.562"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 10.30
* B-V [mag]: +0.06
* remarks:
Data for the minor planet:
* general information:
number, name: (88) Thisbe
approx. diameter [km]: 232
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), Hipparcos
number of used observations: 200 USNO, 59 TMO, 72 HIP
number of rejected observations: 0
time covered by the observations: 1990 03 10 - 2004 09 12
rms residuals ["] (RA,DE): 0.08", 0.07"
estimated positional accuracy at epoch of event ["]: 0.03", 0.02"
remarks:
* orbital elements
Semimajor axis = 2.76776006055674 AU
Eccentricity = 0.164269326072920
Inclination = 5.2178779036121 deg
Long. of node = 276.7811449303759 deg
Arg. of pericenter = 36.6388493174424 deg
Mean anomaly = 349.2312397482713 deg
Epoch of elements : MJD 53276.75000000 TDT (Sep 28, 2004, 18.000000 h)
Path coordinates: click here
Calculator(s): Jan Manek
----------------------------------------------------------------------------
Jan Manek
Werichova 950
152 00 Praha 5 - Barrandov |_|_|
Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
--------------------------------------------------------------------U---U---