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Kedves Mindenki !
Tovabbitom Nektek azt a levelet, amit Jan MANEK kuldott a
(3) Juno okkultacio elorejelzeserol.
Kerem, hogy az erintetteknek tovabbitsak ezeket a friss
szamitasokat:
Magyarorszagon kb. 10 mp a fedes, viszont Ausztriaban 22 mp-et
megkozeliti.
A pontos szamitasoknak koszonhetoen mindenkinek ajanlom,
hogy aki
csak teheti merje le az idotartamot, hiszen ez az egyik
legkedvezobb
fedes ebben az evben.
Udv.Lantos Zsolt
> -----Eredeti uzenet-----
> Felado: Jan Manek [SMTP:jmanek@mbox.vol.cz]
> Kuldve: 2000. majus 18. 9:17
> Cimzett: Joan and David Dunham; David Dunham; Edwin Goffin; Mike
> Kretlow; Martin Federspiel; planoccult@aula.com
> Masolatot kap: rcs@nofs.navy.mil; psada@ix.netcom.com; Bill Owen;
> Marek Zawilski; Janusz Wiland; Leszek Benedyktowicz; Wieslaw
Slotwinski;
> robinson@lunar-occultations.com
> Targy: [PLANOCCULT] Update for (3) Juno on May 24/25, 2000
> Fontossag: Surgos
>
> IOTA/IOTA-ES occultation update for
> (3) Juno / TYC 5212-00753-1 = SAO 145458 event on May 24/25,
2000
> visible from central and NE Europe
>
> Summary
>
> In the night of May 24/25, 2000 a 9.5 mag star TYC 5212-00753-1 =
SAO
> 145458
> will be occulted by a large 267 km asteroid (3) Juno. This update is
based
>
> on USNO/Flagstaff, TMO and Hipparcos astrometry for the asteroid and
> Tycho-2
> star position.
>
> The updated path shows ~0.2 path width east shift with time ~0.2
minutes
> later compared to Edwin Goffin´s nominal prediction (which is well
within
> update errors).
>
> The path of this occultation runs over very large part of the Europe.
> The path is almost grazing Earth globe so the path projection on
ground
> is very wide and the star altitude is very low. Chances for observing
> where the star will be more than ~5 degrees high are in northern
Italy
> and Switzerland at ~23:38.5 UT, Austria, Hungary and S Germany
~23:38.8
> UT,
> Czech Republic and Slovakia ~23:39 UT, maybe eastern parts of middle
and
> north Germany, surely Poland and western Ukraina around 23:39.5 UT,
> Belarus
> and Lithuania at ~23:40 UT, Latvia, Estonia, NW Russia with
St.Peterburg
> and southern Finland at ~23:41 UT - here also twilight will be a
> complication.
>
> Be sure to select a site with free horizon to the east and surely try
to
> locate the star at similar altitude a day or two before the event.
> Brightness drop is expected to be 1.2 magnitudes, which is enough for
> visual observers. Use the neighbouring star SAO 145450 as a reference
> star.
> Due to altitude and scintillation it may be a hard observation, so
CCD
> scans or video records are recommended. Moon will be no problem
although
> it
> is only 16 degrees distant, because at the time of the event it will
just
> rising.
>
> No recent observation are available, however orbit solution is good
enough
>
> to encourage observers to give a try, despite of the low altitude.
>
>
> The event at one glimpse:
> * date and approx. UT time of event: May 25, 2000 @ 23:40 UT
> * magnitude of target star: 9.5
> * magnitude drop [mag]: 1.2
> * estimated maximum duration [s]: 21.8
> * path description: given above
> * Goffin´s original chart reference: A00_0501
>
> The occultation path:
> * approximate ground width [km]: 1100
> * uncertainty [path widths]: 0.6
> * uncertainty in time [s]: 20
> * map: attached or it can be found at following WEB pages:
>
http://sorry.vse.cz/~ludek/mp/2000
>
http://lunar-occultations.com/iota/asteroids/astrndx.htm
> * remarks: Path uncertainities are given according to nominal star
> position errors and expected asteroid positional accuracy.
> !!!!!!!
> Circles along path indicates the centerline for this event.
> They are more accurate than the path limit lines.
> !!!!!!!
>
> Data for the target star:
> * name: PPM 205298 = SAO 145458 = TYC 5212-00753-1
> * constellation: Aquarius
> * J2000 position [h,m,s; o,´,"]: 21h 31m 33.909s; -03o 04´ 50.98"
> * position source: Tycho-2
> * estimated accuracy ["]: 0.04 (0.03", 0.03")
> * V mag [mag]: 9.54
> * B-V [mag]: +1.10
> * remarks:
> Target star is in mid-west Aquarius, 2.5 degrees almost exactly
north
>
> of a 2.9 mag star beta Aquarii. There is good brightness
reference
> star
> SAO 145450 (mag 9.4) only 6.7´ WNW of target for this event with
not
> very large brightness drop.
>
> Close finding chart:
> attached or it can be found at following WEB pages:
>
http://sorry.vse.cz/~ludek/mp/2000
> * occulted star is in center - labeled with cross
> * field is 3.0x3.0 degrees
> * limiting magnitude is 12.5
> * labeled stars have indicated SAO numbers
>
> Data for the minor planet:
> * general information:
> number, name: (3) Juno
> approx. diameter [km]: 267
> * orbital information
> orbit source: calculation Manek
> source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill
> Owen),
> Hipparcos
> number of used observations: 55 USNO, 8 TMO, 69 Hipparcos
> number of rejected observations: 2 USNO
> time covered by the observations: 1990 01 17 - 1999 07 18
> rms residuals ["] (RA,DE): 0.06", 0.07"
> estimated positional accuracy at epoch of event ["]: 0.07"
> remarks: No recent observations are available. However as the
> excellent
> observations cover almost 10 years, the orbit should be good
enough
> to give a reliable update.
>
> Data for the event:
> * UT date and time of least geocentric approach: 23:40.7 UT
> * approx. V mag of minor planet at event [mag]: 10.3
> * geocentric parallax of minor planet ["]: 3.586
> * magnitude drop [mag]: 1.2
> * estimated maximum duration [s]: 21.8
> * apparent motion of minor planet ["/h]: 24.83
> * angular distance to moon, phase of moon [deg,%]: 16, 66%
> * remarks:
>
> Centerline path coordinates:
> Altitude
> E. Longitude Latitude U.T. star sun
> ........ shortened ..........................
> o ´ " o ´ " h m s o o
> 6 0 0 47 25 52 23 38 31 5 -22
> 7 0 0 47 32 47 23 38 33 6 -22
> 8 0 0 47 41 3 23 38 36 6 -21
> 9 0 0 47 50 42 23 38 38 7 -21
> 10 0 0 48 1 45 23 38 41 7 -21
> 11 0 0 48 14 13 23 38 45 8 -21
> 12 0 0 48 28 8 23 38 48 9 -20
> 13 0 0 48 43 32 23 38 52 9 -20
> 14 0 0 49 0 28 23 38 57 10 -20
> 15 0 0 49 18 57 23 39 1 10 -19
> 16 0 0 49 39 3 23 39 6 11 -19
> 17 0 0 50 0 49 23 39 11 11 -18
> 18 0 0 50 24 18 23 39 16 12 -18
> 19 0 0 50 49 36 23 39 22 12 -17
> 20 0 0 51 16 47 23 39 28 13 -17
> 21 0 0 51 45 58 23 39 34 13 -16
> 22 0 0 52 17 16 23 39 41 14 -15
> 23 0 0 52 50 51 23 39 48 14 -15
> 24 0 0 53 26 53 23 39 55 14 -14
> 25 0 0 54 5 38 23 40 3 14 -13
> 26 0 0 54 47 23 23 40 11 15 -12
> 27 0 0 55 32 34 23 40 20 15 -11
> 28 0 0 56 21 44 23 40 29 15 -10
> 29 0 0 57 15 43 23 40 39 15 -9
> 30 0 0 58 15 46 23 40 49 15 -8
> 31 0 0 59 24 5 23 41 0 15 -7
> 32 0 0 60 44 59 23 41 13 14 -5
> ........ shortened ..........................
>
> Calculator: Jan Manek <<0524jun1.gif>> <<0524jun0.gif>>
<
>
>
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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 : jmanek@mbox.vol.cz |-O-O-|