IOTA/IOTA-ES occultation update for
(379) Huenna / TYC 1355-00208-1 on September 21/22, 2004
visible from S England, NW France, W Belgium, S Netherlands,
N Germany, N Poland, S Lithuania, Belarus and Russia in twilight
Summary
In the night of September 21/22, 2004 a faint 10.7 mag star TYC 1355-00208-1 will be occulted by a 96 km asteroid (379) Huenna. This update is based on USNO/Flagstaff and La Silla astrometry for the asteroid and UCAC2 star position.
The updated path shows large ~8 path width north shift with time ~0.3 minute later compared to Edwin Goffin's nominal prediction.
Updated path runs over S England ~2:45.2 UT, NW France ~2:45.2 UT, W Belgium ~2:45.3 UT, S Netherlands ~2:45.3 UT, N Germany ~2:45.5 UT, N Poland ~2:45.7 UT, S Lithuania ~2:46.0 UT, Belarus ~2:46.1 UT and Russia in twilight ~2:46.5 UT. 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 22, 2004 @ 02:45 UT (Europe)
* magnitude of target star: 10.7
* magnitude drop [mag]: 4.3
* estimated maximum duration [s]: 3.9
* approx. V mag of minor planet at event [mag]: 15.0
* geocentric parallax of minor planet ["]: 2.667
* apparent motion of minor planet ["/h]: 36.69
* angular distance to moon, phase of moon [deg,%]: 165, 55%
* Goffin's original chart reference: A04_0925
The occultation path with path maps:
* approximate ground width [km]: 115
* uncertainty [path widths]: 1.4
* uncertainty in time [s]: 12
* 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 mid-south Gemini, about 1.5 degrees south of 3.5 mag star delta Geminorum = SAO 79380.
!!! 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 1355-00208-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 07h 21m 22.8663s; +20o 33' 12.340"
* position source: UCAC2
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 10.72
* B-V [mag]: +0.36
* remarks:
Data for the minor planet:
* general information:
number, name: (379) Huenna
approx. diameter [km]: 96
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), La Silla (Raoul Behrend)
number of used observations: 109 USNO, 3 TMO
number of rejected observations: 0
time covered by the observations: 1998 09 24 - 2004 01 09
rms residuals ["] (RA,DE): 0.14", 0.14"
estimated positional accuracy at epoch of event ["]: 0.11", 0.04"
remarks:
* orbital elements
Semimajor axis = 3.13024137702285 AU
Eccentricity = 0.191471733364817
Inclination = 1.6684223421014 deg
Long. of node = 172.2835532611370 deg
Arg. of pericenter = 180.1175684769158 deg
Mean anomaly = 76.8499619377884 deg
Epoch of elements : MJD 53270.11000000 TDT (Sep 22, 2004, 2.640000 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---