IOTA/IOTA-ES occultation update for
(70) Panopaea / TYC 1974-00119-1/AB on March 20/21, 2004
visible from Japan, Asia and Europe
Summary
In the night of March 20/21, 2004 a faint 10.9 mag star TYC 1974-00119-1/AB will be occulted by a 127 km asteroid (70) Panopaea. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.
The updated path is different compared to Edwin Goffin's nominal prediction due to double star nature of target.
Updated path for component A runs over south Japan ~18:20.7 UT, followed by China, middle Asia, S Russia ~18:30.5 UT,
NW Turkey ~18:32.1 UT, Greece ~18:33.3 UT, S Italy and Sicilia ~18:34.0 UT, N Tunis ~18:34.9 UT and N Algeria ~18:35.2 UT in twilight.
Updated path for component B runs over mid-north Japan ~18:21.7 UT, followed by NE China, NE Mongolia, Siberia, Russia around 18:31 UT,
SE Belarus ~18:32.4 UT, NW Ukraine ~18:32.5 UT, SE Poland ~18:33.3 UT, Slovakia ~18:33.6 UT, NW Hungary ~18:33.9 UT, Austria ~18:34.1 UT,
SE Switzerland ~18:34.7 UT, N Italy ~18:34.7 UT, SE France in twilight ~18:35.3 UT and NE Spain in even stronger twilight ~18:35.9 UT.
Please check the path chart for details; uncertainty may be significantly larger than indicated in charts.
Here is current station list for component A: European cities and observatories plus other sites.
Here is current station list for component B: European cities and observatories plus other sites.
If you would like to have your station listed with other observetories and sites, send me your request using the structure descripted here
Target star is a double star TDS 7099 according to WDS2001 which gives following info:
magnitudes 11.47+11.61, separation 0.7" at PA 205° (all for 1991).
On this basis and UCAC2 position
used as position of photocenter I have computed absolute positions of components:
component A (brighter) : 10h 11m 57.1338s; +27o 40' 12.366"
component B (fainter) : 10h 11m 57.1115s; +27o 40' 11.732"
which were used for subsequent calculations. As the component separation is given only to 0.1"
and epoch is 13 years old, the true accuracy of component positions may be significantly lower than
accuracy given for the star in UCAC2; which I have however used in calculations to have at least some
star position uncertainty accounted for.
Brightness drop will be at most around 0.7 magnitudes only as the pair will remain unresolved in most
telescopes so the event will be on limit for visual observers. Video or CCD is strongly recommended.
Original Tycho-1 gives flag indicating the star wasn't investigated for duplicity. I suppose TDS means "Tycho Double Star" and there probably exist a newer paper where the data came from.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: March 20, 2004 @ 18:34 UT (Europe)
* magnitude of target star: 10.9
* magnitude drop [mag]: only about 0.7 mag
* estimated maximum duration [s]: 12.1
* approx. V mag of minor planet at event [mag]: 12.9
* geocentric parallax of minor planet ["]: 4.106
* apparent motion of minor planet ["/h]: 24.28
* angular distance to moon, phase of moon [deg,%]: 145, 0%
* Goffin's original chart reference: A04_0308
The occultation path with path maps:
* approximate ground width [km]: 140
* uncertainty [path widths]: 0.6
* uncertainty in time [s]: 10
* map: Overview component A
Overview component B
Japanese part component A
Japanese part component B
Asia and European part component A
Asia and European part component B
European part component B enlarged
* 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 north Leo, about 4.4 degrees NNW of 3.4 mag star zeta Leonis = SAO 81265 or
41' northwest of 6.0 mag star SAO 81243.
!!! 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 1974-00119-1/AB
* constellation: Leo
* J2000 position [h,m,s; o,',"]: 10h 11m 57.1234s; +27o 40' 12.070"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 10.90
* B-V [mag]: +0.84
* remarks: Target star is a double star TDS 7099 according to WDS2001 which gives following info:
magnitudes 11.47+11.61, separation 0.7" at PA 205° (all for 1991). On this basis and UCAC2 position
used as position of photocenter I have computed absolute positions of components:
component A (brighter) : 10h 11m 57.1338s; +27o 40' 12.366"
component B (fainter) : 57.1115s; 11.732"
which were used for subsequent calculations.
Data for the minor planet:
* general information:
number, name: (70) Panopaea
approx. diameter [km]: 115
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 140 USNO, 35 TMO
number of rejected observations: 0
time covered by the observations: 1996 05 04 - 2004 03 10
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.05", 0.04"
remarks:
Path coordinates: component A and component B
Calculator(s): Jan Manek
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Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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