******************************************************************************
A Magyar Csillagászati Egyesület elektronikus hírlevele 2000.01.13.
******************************************************************************
VIII. évfolyam, 879. szám
------------------------------------------------------------------------------
Megrendelés a listadmin@mcse.hu címre küldött levélben:
"subscribe mcseklev [non|win|cwi|852]"
Használati útmutató ugyanitt: "help mcseklev [non|win|cwi|852]"
------------------------------------------------------------------------------
A (49) PALES csillagfedése (jan. 16/17.)
Az elõrejelzések szerint a (49) PALES 9,6 magnitúdós kisbolygó okkultációja
január 16/17-én Magyarországról is látszani fog. A jelenség megfigyeléséhez
segítséget nyújtó vetületi térkép és észlelõtérkép a következõ címeken
található:
http://www.mcse.hu/okkult/0117pal1.gif
http://www.mcse.hu/okkult/0117pal3.gif
Reménykedjünk, hogy a felhõzet ritkul - legalább a jelenség idejére!
(Faragó Ottó, Nyözö, Szabó Sanyi, Tepi, Tuboly Vince)
********************
IOTA/IOTA-ES occultation update for
(49) Pales / TYC 1880 01817 1 event on January 16/17, 2000
visible from Europe, Canada and USA
Summary
In the night January 16/17, 1999 a 9.6 mag star TYC 1880 01817 1 will be
occulted by a 154 km asteroid (49) Pales. This update is based on TMO and
USNO/Flagstaff astrometry for the asteroid and TRC1.0 star position.
The updated path shows small ~1 path width north shift with occultation time
few seconds earlier compared to Edwin Goffin´s nominal prediction.
The path of this occultation runs over Romania ~00:58 UT, Hungary and SW
Slovakia at ~00:58.5 UT, NE Austria and SW Czech Repuplic at ~00:59 UT,
southern Germany ~00:59.5 UT, Belgium and N France ~01:00 UT, south England
at ~01:01 UT and S Ireland ~01:02 UT. After crossing Atlantic ocean path
runs over NW Newfoundland ~01:07 UT, very SE Quebec provincia with Quebec
itself also ~01:09 UT and runs to SW to USA. It runs oven Lake Huron,
Michigan ~01:10.5 UT, Lake Michigan, south Wisconsin and north Illinois at
~01:11 UT, SE Iowa ~01:11.5 UT, NW tip of Missouri, SE tip of Nebraska and
NW Kansas ~01:12 UT, SE Colorado ~01:12.5 UT, NW New Mexico ~01:13 UT and in
twilight also middle Arizona.
I would count this as a favourable event, but as TYCHO gives for the star
´X´ flag (=dubious astrometric reference star), the error of star position
may be larger than indicated (and therefore also the update accuracy).
The target star is the NE on in a small triangle of stars (11.0, 10.4 and
9.6 mags) so these can be used as nice references. Good luck !
The event at one glimpse:
* date and approx. UT time of event: January 17, 2000 @ 00:59 UT (Euro)
01:11 UT (N.Am.)
* magnitude of target star: 9.6
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 16.0
* path description: given above
* Goffin´s original chart reference: A00_0110(.PS.GZ)
The occultation path:
* approximate ground width [km]: 180
* uncertainty [path widths]: 0.9
* uncertainty in time [s]: 15
Data for the target star:
* name: TYC 1880 01817 1
* constellation: Gemini
* J2000 position [h,m,s; o,´,"]: 06h 35m 54.054s; +23o 18´ 35.08"
* position source: TRC1.0
* estimated accuracy ["]: 0.05" (0.04", 0.03")
* V mag [mag]: 9.60
* B-V [mag]: +0.23
* remarks: TYCHO gives quality flag 4(=high) with ´(unresolved) duplicity´
flag and also ´dubious astrometric reference star´ flag. Although the
star position accuracy seems to be good, true position error may be
larger than indicated. Star is not in ACT.
Target star is in middle Gemini, approximately midway between 3.0 mag
star epsilon Geminorum and 2.9 mag variable mui Geminorum. Target star
is 17´ NW of 7.0 mag star SAO 78545. Target star is the NE star and
also the brightest one in a small triangle.
Data for the minor planet:
* general information:
number, name: (49) Pales
approx. diameter [km]: 154
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 52 USNO, 27 TMO
number of rejected observations: 4 USNO, 1 TMO
time covered by the observations: 1998 06 26 - 1999 12 31
rms residuals ["] (RA,DE): 0.07", 0.07"
estimated positional accuracy at epoch of event ["]: 0.07"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 01:04:38 UT
* approx. V mag of minor planet at event [mag]: 11.6
* geocentric parallax of minor planet ["]: 5.095
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 16.0
* apparent motion of minor planet ["/h]: 27.68
* angular distance to moon, phase of moon [deg,%]: 40, 76%
* remarks:
+----------------------------------------------------------------------------+
| MAGYAR CSILLAGÁSZATI EGYESÜLET -- 1461 Budapest, Pf. 219. |
| * E-MAIL: mcse@mcse.hu * WWW: http://www.mcse.hu * |
| |
| Az MCSE elektronikus hírlevele és levelezõ listái: listadmin@mcse.hu |
| Hírlevelünk online archívuma: http://www.mcse.hu/mcseklev |
+----------------------------------------------------------------------------+
|
