Update for (140) Siwa - January 16/17, 2003
Update computed by Jan Manek; issued 05 Jan 2003 15:06 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(140) Siwa / TYC 0835-01394-1 on January 16/17, 2003
visible from Arabian Peninsula, N Egypt, NE Libya, Malta, N Tunisia,
middle Spain and N Portugal
Summary
In the night of January 16/17, 2003 a faint 10.9 mag star TYC 0835-01394-1
will be occulted by a 114 km asteroid (140) Siwa. This update is based on
USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.
The updated path shows ~1 path width north shift with time 0.7 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs over Arabian Peninsula, N Egypt ~0:10.5 UT, NE Libya ~0:11.3 UT, Malta ~0:12.5 UT,
N Tunisia ~0:13.0 UT, middle Spain around 0:14.5 UT with Valencia and Madrid in path and finally
N Portugal with Porto in path ~0:15.0 UT. Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: January 17, 2003 @ 00:13 UT (Europe)
* magnitude of target star: 10.9
* magnitude drop [mag]: 2.6
* estimated maximum duration [s]: 10.0
* path description: given above
* Goffin's original chart reference: A03_0117
The occultation path:
* approximate ground width [km]: 120
* uncertainty [path widths]: 0.8
* uncertainty in time [s]: 9
* map: below
* remarks: Path uncertainties are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: TYC 0835-01394-1
* constellation: Leo
* J2000 position [h,m,s; o,',"]: 10h 01m 18.7031s; +14o 30' 59.250"
* position source: recent UCAC position combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.02" (0.01", 0.02")
* V mag [mag]: 10.85
* B-V [mag]: +0.53
* remarks:
Target star is in west Leo, about 3.1 degrees NNW of 1.4 mag star alpha Leonis = Regulus = SAO 98967.
Should be easy to find.
!!! 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.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 13.0
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (140) Siwa
approx. diameter [km]: 114
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 103 USNO
number of rejected observations: 18 USNO
time covered by the observations: 1997 11 22 - 2002 12 20
rms residuals ["] (RA,DE): 0.06", 0.06"
estimated positional accuracy at epoch of event ["]: 0.04", 0.04"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 00:09.0 UT
* approx. V mag of minor planet at event [mag]: 13.4
* geocentric parallax of minor planet ["]: 3.641
* magnitude drop [mag]: 2.6
* estimated maximum duration [s]: 10.0
* apparent motion of minor planet ["/h]: 23.45
* angular distance to moon, phase of moon [deg,%]: 49, 98%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2003 Jan 17
140 Siwa
0h 9.0m UT
35-01394-1 10.9 10 1 18.703 14 30 59.25TYC 0835-01394-1
13.4 114 10.0 2.415 -1.447 10.45
32.066 14.514 180.22 -20.86
0.1498 .09913 .19842 -5.76658 2.86753 -0.00297 0.00088
2000 200.4984382003 111.00000196.699064107.3459773.188621 0.215176732.736967182.148035528.345 0.15
RATE 2.1767060 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Center Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
Latitude Latitude
38 0 0 26 13 54 0 9 3 77 -55 26 49 42 25 38 13
37 0 0 26 42 1 0 9 13 77 -56 27 17 45 26 6 23
36 0 0 27 9 46 0 9 23 77 -57 27 45 26 26 34 12
35 0 0 27 37 11 0 9 32 77 -58 28 12 47 27 1 40
34 0 0 28 4 13 0 9 41 76 -58 28 39 45 27 28 47
33 0 0 28 30 53 0 9 51 76 -59 29 6 21 27 55 31
32 0 0 28 57 11 0 9 60 76 -60 29 32 35 28 21 54
31 0 0 29 23 6 0 10 9 75 -61 29 58 25 28 47 53
30 0 0 29 48 38 0 10 18 75 -61 30 23 53 29 13 29
29 0 0 30 13 47 0 10 27 74 -62 30 48 57 29 38 43
28 0 0 30 38 32 0 10 36 74 -63 31 13 38 30 3 32
27 0 0 31 2 54 0 10 45 73 -64 31 37 54 30 27 58
26 0 0 31 26 51 0 10 53 72 -64 32 1 47 30 52 0
25 0 0 31 50 24 0 11 2 72 -65 32 25 15 31 15 38
24 0 0 32 13 32 0 11 11 71 -65 32 48 19 31 38 51
23 0 0 32 36 17 0 11 19 70 -66 33 10 58 32 1 40
22 0 0 32 58 36 0 11 28 70 -67 33 33 13 32 24 4
21 0 0 33 20 31 0 11 36 69 -67 33 55 3 32 46 4
20 0 0 33 42 0 0 11 44 68 -68 34 16 28 33 7 38
19 0 0 34 3 5 0 11 52 67 -68 34 37 27 33 28 48
18 0 0 34 23 45 0 12 0 67 -69 34 58 2 33 49 33
17 0 0 34 43 59 0 12 8 66 -69 35 18 12 34 9 52
16 0 0 35 3 49 0 12 16 65 -70 35 37 56 34 29 46
15 0 0 35 23 13 0 12 24 65 -70 35 57 16 34 49 16
14 0 0 35 42 12 0 12 31 64 -70 36 16 10 35 8 19
13 0 0 36 0 46 0 12 39 63 -71 36 34 39 35 26 58
12 0 0 36 18 55 0 12 46 62 -71 36 52 42 35 45 11
11 0 0 36 36 38 0 12 54 62 -71 37 10 21 36 2 60
10 0 0 36 53 56 0 13 1 61 -71 37 27 34 36 20 23
9 0 0 37 10 49 0 13 8 60 -72 37 44 23 36 37 20
8 0 0 37 27 17 0 13 15 59 -72 38 0 46 36 53 53
7 0 0 37 43 20 0 13 22 59 -72 38 16 44 37 10 0
6 0 0 37 58 58 0 13 29 58 -72 38 32 17 37 25 43
5 0 0 38 14 10 0 13 36 57 -72 38 47 25 37 40 60
4 0 0 38 28 58 0 13 43 56 -72 39 2 9 37 55 52
3 0 0 38 43 21 0 13 49 56 -72 39 16 27 38 10 20
2 0 0 38 57 19 0 13 56 55 -72 39 30 21 38 24 22
1 0 0 39 10 53 0 14 2 54 -72 39 43 50 38 37 60
0 0 0 39 24 2 0 14 9 53 -71 39 56 55 38 51 13
- 1 0 0 39 36 46 0 14 15 53 -71 40 9 35 39 4 1
- 2 0 0 39 49 6 0 14 21 52 -71 40 21 51 39 16 25
- 3 0 0 40 1 1 0 14 27 51 -71 40 33 43 39 28 24
- 4 0 0 40 12 32 0 14 33 50 -70 40 45 10 39 39 59
- 5 0 0 40 23 39 0 14 39 50 -70 40 56 13 39 51 10
- 6 0 0 40 34 22 0 14 45 49 -70 41 6 52 40 1 56
- 7 0 0 40 44 41 0 14 50 48 -69 41 17 8 40 12 18
- 8 0 0 40 54 36 0 14 56 47 -69 41 26 59 40 22 16
- 9 0 0 41 4 6 0 15 2 47 -69 41 36 26 40 31 51
- 10 0 0 41 13 13 0 15 7 46 -68 41 45 30 40 41 1
- 11 0 0 41 21 57 0 15 12 45 -68 41 54 10 40 49 47
- 12 0 0 41 30 16 0 15 18 44 -67 42 2 27 40 58 10
- 13 0 0 41 38 12 0 15 23 44 -67 42 10 20 41 6 8
- 14 0 0 41 45 45 0 15 28 43 -67 42 17 50 41 13 44
........................... shortened .............................
----------------------------------------------------------------------------
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@worldonline.cz |-O-O-|
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