Update for (407) Arachne - October 24/25, 2002
Update computed by Jan Manek; issued 17 Oct 2002 21:30:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(407) Arachne / TYC 1926-00284-1 on October 24/25, 2002
visible from Ireland, England, Netherland, N Germany, Poland and Ukraine
Summary
In the night of October 24/25, 2002 a 10.8 mag star TYC 1926-00284-1
will be occulted by a 98 km asteroid (407) Arachne. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.
The updated path shows ~1.5 path width north shift with time ~0.7 minutes earlier compared to
Edwin Goffin's nominal prediction.
Updated path runs over Ireland ~3:30.9 UT with Dublin on north limit, England ~3:31.3 UT with
Liverpool on north limit and Birmingham on south limit, N Netherlands ~3:31.7 with Amsterdam on south limit,
N Germany around 3:32.1 UT with Hannover and Berlin in path, Poland around 3:32.8 UT with Lodz in path
and finally Ukraine from west to east around 3:34 UT with Kiev on north limit and Doneck in path.
Follows also Rostov/o/Don in Russia on south limit under strong twilight.
Observers within declared uncertainty area should try to observe.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: October 25, 2002 @ 03:33 UT (Central Europe)
* magnitude of target star: 10.8
* magnitude drop [mag]: 3.1
* estimated maximum duration [s]: 7.1
* path description: given above
* Goffin's original chart reference: A02_1037
The occultation path:
* approximate ground width [km]: 110
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 11
* 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 1926-00284-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 07h 59m 14.2992s; +23o 38' 24.479"
* position source: recent UCAC position combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.02" (0.01", 0.01")
* V mag [mag]: 10.75
* B-V [mag]: +0.35
* remarks:
Recent UCAC position was provided by Marion and Norbert Zacharias.
Target star is in eastern Gemini, about 3.5 degrees southeast of 3.6 mag star kappa Geminorum = SAO 79653.
Very close to border with Cancer.
!!! 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: (407) Arachne
approx. diameter [km]: 98
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 91 USNO, 12 TMO
number of rejected observations: 8 USNO, 2 TMO
time covered by the observations: 1997 10 17 - 2001 12 16
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.08", 0.08"
remarks: No recent opposition astrometry.
Data for the event:
* UT date and time of least geocentric approach: 03:34.9 UT
* approx. V mag of minor planet at event [mag]: 13.8
* geocentric parallax of minor planet ["]: 3.822
* magnitude drop [mag]: 3.1
* estimated maximum duration [s]: 7.1
* apparent motion of minor planet ["/h]: 29.98
* angular distance to moon, phase of moon [deg,%]: 43, 87%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Oct 25
407 Arachne
3h 34.9m UT
26-00284-1 10.8 7 59 14.299 23 38 24.48TYC 1926-00284-1
13.8 98 7.1 2.301 2.096 -8.30
32.715 23.643 122.31 -12.02
3.5823 .11550 .39584 7.53656 -2.17191 -0.00559 0.00111
2000 69.616765320021023.0000081.642816 294.9057847.543018 0.068967052.625149752.444100918.885 0.15
RATE 2.3172503 .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
- 20 0 0 51 59 13 3 30 3 40 -40 51 29 47 52 28 47
- 19 0 0 52 5 17 3 30 6 41 -40 51 35 53 52 34 47
- 18 0 0 52 10 59 3 30 10 41 -39 51 41 38 52 40 27
- 17 0 0 52 16 19 3 30 14 42 -39 51 47 1 52 45 45
- 16 0 0 52 21 19 3 30 17 43 -38 51 52 3 52 50 42
- 15 0 0 52 25 58 3 30 21 43 -38 51 56 43 52 55 19
- 14 0 0 52 30 15 3 30 25 44 -37 52 1 3 52 59 34
- 13 0 0 52 34 12 3 30 29 44 -37 52 5 2 53 3 29
- 12 0 0 52 37 48 3 30 33 45 -36 52 8 39 53 7 3
- 11 0 0 52 41 3 3 30 37 45 -35 52 11 56 53 10 16
- 10 0 0 52 43 57 3 30 40 46 -35 52 14 51 53 13 9
- 9 0 0 52 46 31 3 30 44 46 -34 52 17 26 53 15 42
- 8 0 0 52 48 44 3 30 48 47 -34 52 19 40 53 17 53
- 7 0 0 52 50 36 3 30 52 48 -33 52 21 34 53 19 45
- 6 0 0 52 52 8 3 30 56 48 -33 52 23 6 53 21 16
- 5 0 0 52 53 19 3 31 0 49 -32 52 24 18 53 22 27
- 4 0 0 52 54 10 3 31 4 49 -32 52 25 9 53 23 17
- 3 0 0 52 54 40 3 31 9 50 -31 52 25 40 53 23 47
- 2 0 0 52 54 50 3 31 13 50 -30 52 25 50 53 23 57
- 1 0 0 52 54 39 3 31 17 51 -30 52 25 39 53 23 46
0 0 0 52 54 8 3 31 21 51 -29 52 25 8 53 23 15
1 0 0 52 53 16 3 31 25 52 -29 52 24 16 53 22 23
2 0 0 52 52 4 3 31 30 52 -28 52 23 3 53 21 11
3 0 0 52 50 31 3 31 34 53 -28 52 21 29 53 19 39
4 0 0 52 48 37 3 31 38 53 -27 52 19 35 53 17 46
5 0 0 52 46 23 3 31 43 54 -26 52 17 20 53 15 33
6 0 0 52 43 48 3 31 47 54 -26 52 14 43 53 12 59
7 0 0 52 40 52 3 31 52 55 -25 52 11 46 53 10 5
8 0 0 52 37 35 3 31 56 55 -25 52 8 28 53 6 49
9 0 0 52 33 58 3 32 1 56 -24 52 4 49 53 3 13
10 0 0 52 29 59 3 32 5 56 -23 52 0 48 52 59 16
11 0 0 52 25 39 3 32 10 56 -23 51 56 27 52 54 58
12 0 0 52 20 58 3 32 14 57 -22 51 51 44 52 50 19
13 0 0 52 15 56 3 32 19 57 -22 51 46 39 52 45 19
14 0 0 52 10 32 3 32 24 58 -21 51 41 13 52 39 58
15 0 0 52 4 47 3 32 28 58 -20 51 35 25 52 34 15
16 0 0 51 58 40 3 32 33 59 -20 51 29 15 52 28 11
17 0 0 51 52 11 3 32 38 59 -19 51 22 44 52 21 45
18 0 0 51 45 20 3 32 43 59 -19 51 15 50 52 14 57
19 0 0 51 38 8 3 32 48 60 -18 51 8 35 52 7 48
20 0 0 51 30 33 3 32 53 60 -17 51 0 56 52 0 16
21 0 0 51 22 36 3 32 58 61 -17 50 52 56 51 52 22
22 0 0 51 14 16 3 33 3 61 -16 50 44 32 51 44 6
23 0 0 51 5 33 3 33 8 61 -15 50 35 46 51 35 27
24 0 0 50 56 28 3 33 13 62 -15 50 26 37 51 26 26
25 0 0 50 46 60 3 33 18 62 -14 50 17 5 51 17 2
26 0 0 50 37 9 3 33 23 62 -13 50 7 10 51 7 15
27 0 0 50 26 54 3 33 29 63 -13 49 56 51 50 57 4
28 0 0 50 16 16 3 33 34 63 -12 49 46 8 50 46 30
29 0 0 50 5 14 3 33 39 63 -11 49 35 2 50 35 33
30 0 0 49 53 48 3 33 45 64 -11 49 23 31 50 24 12
31 0 0 49 41 58 3 33 50 64 -10 49 11 37 50 12 27
32 0 0 49 29 44 3 33 56 64 -9 48 59 18 50 0 17
33 0 0 49 17 5 3 34 1 64 -9 48 46 35 49 47 44
34 0 0 49 4 2 3 34 7 65 -8 48 33 26 49 34 46
35 0 0 48 50 34 3 34 12 65 -7 48 19 53 49 21 23
36 0 0 48 36 42 3 34 18 65 -7 48 5 55 49 7 36
37 0 0 48 22 23 3 34 24 65 -6 47 51 32 48 53 23
38 0 0 48 7 40 3 34 30 65 -5 47 36 43 48 38 45
39 0 0 47 52 31 3 34 36 65 -4 47 21 29 48 23 42
40 0 0 47 36 56 3 34 41 65 -4 47 5 48 48 8 12
........................... 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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