IOTA/IOTA-ES occultation update for
(746) Marlu / TYC 2950-01251-1 = SAO 41382 on October 8/9, 2004
visible from E Tunisia, Italy, Austria, W Czechia, E Germany,
Denmark and SW Norway
Summary
In the night of October 8/9, 2004 a bright 9.1 mag star TYC 2950-01251-1 = SAO 41382 will be occulted by a 76 km asteroid (746) Marlu. This update is based on USNO/Flagstaff, TMO and OAC astrometry for the asteroid and UCAC2 star position.
The updated path shows ~1 path width E shift with time ~0.3 minute later compared to Edwin Goffin's nominal prediction.
Updated path runs over E Tunisia ~22:52.5 UT, Italy 22:53.5 UT, Austria ~22:54.0 UT, grazes W Czechia ~22:54.4 UT, E Germany ~22:54.5 UT, Denmark ~22:55.2 UT and SW Norway ~22:55.7 UT. Please check the path chart for details.
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Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: October 8, 2004 @ 22:54 UT (Europe)
* magnitude of target star: 9.1
* magnitude drop [mag]: 6.9
* estimated maximum duration [s]: 5.9
* approx. V mag of minor planet at event [mag]: 16.0
* geocentric parallax of minor planet ["]: 2.694
* apparent motion of minor planet ["/h]: 19.66
* angular distance to moon, phase of moon [deg,%]: 36, 27%
* Goffin's original chart reference: A04_1035
The occultation path with path maps:
* approximate ground width [km]: 140
* uncertainty [path widths]: 2.8
* uncertainty in time [s]: 25
* 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 east Auriga, about 7.7 degrees north of 3.6 mag star theta Geminorum = SAO 59570
or 10' SSE of 5.0 mag star psi7 Aurigae = SAO 41380.
!!! 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 2950-01251-1 = SAO 41382 = PPM 49384
* constellation: Auriga
* J2000 position [h,m,s; o,',"]: 06h 51m 02.6209s; +41o 36' 57.688"
* position source: UCAC2
* estimated accuracy ["]: 0.02" (0.02", 0.02")
* V mag [mag]: 9.08
* B-V [mag]: +0.37
* remarks:
Data for the minor planet:
* general information:
number, name: (746) Marlu
approx. diameter [km]: 76
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), OAC (A. Lopez, R. Pacheco, J. Forteza)
number of used observations: 118 USNO, 2 TMO, 5 OAC
number of rejected observations: 0
time covered by the observations: 1998 09 27 - 2004 10 02
rms residuals ["] (RA,DE): 0.15", 0.15"
estimated positional accuracy at epoch of event ["]: 0.12", 0.05"
remarks:
* orbital elements
Semimajor axis = 3.10375325761300 AU
Eccentricity = 0.240918412456649
Inclination = 17.5151882814187 deg
Long. of node = 2.1007649834945 deg
Arg. of pericenter = 307.5827373405525 deg
Mean anomaly = 110.7981665361348 deg
Epoch of elements : MJD 53286.95000000 TDT (Oct 8, 2004, 22.800000 h)
Path coordinates: click here
Calculator(s): Jan Manek
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Jan Manek
Werichova 950
152 00 Praha 5 - Barrandov |_|_|
Czech Republic / \
Internet : jan.manek AT worldonline.cz |-O-O-|
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