Update for (120) Lachesis - December 24, 2002
Update computed by Jan Manek; issued 22 Dec 2002 21:39 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(120) Lachesis / TYC 2425-00155-1 on December 24, 2002
visible from Alaska, Norway, Sweden, Denamrk and England
Summary
In the evening of night of December 24/25, 2002 a faint 11.5 mag star TYC 2425-00155-1
will be occulted by a 178 km asteroid (120) Lachesis. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.
The updated path shows ~1 path width northwest shift with time 0.9 minutes earlier compared to
Edwin Goffin's nominal prediction.
Updated path runs over Alaska ~18:28 UT, Norway and Sweden 16:33.5 UT to 16:34.9 UT, western Denmark ~16:35.1 UT,
and England ~16:35.5 UT at low altitudes and twilight.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: December 24, 2002 @ 16:35 UT (Europe)
* magnitude of target star: 11.5
* magnitude drop [mag]: 1.2
* estimated maximum duration [s]: 12.8
* path description: given above
* Goffin's original chart reference: A02_1213
The occultation path:
* approximate ground width [km]: 300
* uncertainty [path widths]: 0.5
* uncertainty in time [s]: 6
* 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 2425-00155-1
* constellation: Auriga
* J2000 position [h,m,s; o,',"]: 06h 26m 57.4568s; +32o 30' 57.989"
* position source: recent UCAC position combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.02" (0.01", 0.02")
* V mag [mag]: 11.54
* B-V [mag]: +0.75
* remarks:
Recent UCAC position was provided by Marion and Norbert Zacharias.
Target star is in south east Auriga, about 5.6 degrees west of 3.6 mag star theta Geminorum = SAO 59570.
Only 9' ENE of target star is 6.5 mag star SAO 59096.
!!! 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 2.0x2.0 degrees
* limiting magnitude is 12.7
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (120) Lachesis
approx. diameter [km]: 178
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 123 USNO, 33 TMO
number of rejected observations: 17 USNO, 3 TMO
time covered by the observations: 1998 02 14 - 2002 12 12
rms residuals ["] (RA,DE): 0.06", 0.07"
estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 16:31.0 UT
* approx. V mag of minor planet at event [mag]: 12.3
* geocentric parallax of minor planet ["]: 3.945
* magnitude drop [mag]: 1.2
* estimated maximum duration [s]: 12.8
* apparent motion of minor planet ["/h]: 30.88
* angular distance to moon, phase of moon [deg,%]: 56, 75%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Dec 24
120 Lachesis
16h 31.0m UT
25-00155-1 11.5 6 26 57.457 32 30 57.99TYC 2425-00155-1
12.3 178 12.8 2.229 -2.441 0.27
-244.038 32.517 -67.84 -23.41
16.5165 .00721 .79513 -7.82661 0.06986 -0.00040 -0.00095
2000 245.86678920021222.00000233.048947341.5465596.956961 0.062004603.115593222.922412117.755 0.15
RATE 1.7922270 .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
-133 0 0 54 31 26 16 26 51 16 -6 56 59 54 52 16 52
-134 0 0 55 23 11 16 26 55 17 -7 57 54 5 53 6 51
-135 0 0 56 14 52 16 26 59 17 -8 58 48 12 53 56 45
-136 0 0 57 6 24 16 27 3 18 -9 59 42 12 54 46 30
-137 0 0 57 57 44 16 27 8 19 -10 60 36 0 55 36 4
-138 0 0 58 48 47 16 27 12 20 -11 61 29 32 56 25 24
-139 0 0 59 39 31 16 27 17 21 -11 62 22 43 57 14 24
-140 0 0 60 29 51 16 27 22 22 -12 63 15 28 58 3 4
-141 0 0 61 19 43 16 27 26 23 -13 64 7 44 58 51 18
-142 0 0 62 9 3 16 27 31 23 -14 64 59 25 59 39 4
-143 0 0 62 57 49 16 27 36 24 -15 65 50 26 60 26 18
-144 0 0 63 45 54 16 27 41 25 -15 66 40 42 61 12 57
-145 0 0 64 33 17 16 27 47 26 -16 67 30 9 61 58 59
-146 0 0 65 19 53 16 27 52 26 -17 68 18 41 62 44 19
-147 0 0 66 5 38 16 27 57 27 -17 69 6 15 63 28 55
-148 0 0 66 50 30 16 28 2 28 -18 69 52 44 64 12 43
-149 0 0 67 34 24 16 28 7 28 -18 70 38 6 64 55 42
-150 0 0 68 17 18 16 28 12 29 -19 71 22 15 65 37 49
-151 0 0 68 59 10 16 28 17 29 -20 72 5 10 66 19 2
-152 0 0 69 39 56 16 28 22 30 -20 72 46 45 66 59 18
-153 0 0 70 19 34 16 28 27 30 -20 73 26 58 67 38 35
-154 0 0 70 58 4 16 28 32 31 -21 74 5 48 68 16 52
-155 0 0 71 35 22 16 28 37 31 -21 74 43 11 68 54 8
-156 0 0 72 11 29 16 28 42 31 -22 75 19 8 69 30 22
-157 0 0 72 46 23 16 28 46 32 -22 75 53 37 70 5 32
-158 0 0 73 20 4 16 28 51 32 -22 76 26 38 70 39 39
-159 0 0 73 52 32 16 28 55 32 -23 76 58 12 71 12 41
-160 0 0 74 23 47 16 28 59 33 -23 77 28 20 71 44 39
-161 0 0 74 53 49 16 29 4 33 -23 77 57 3 72 15 33
........................... shortened .............................
44 0 0 79 44 33 16 32 21 35 -27 82 19 23 77 25 37
43 0 0 79 27 38 16 32 23 35 -27 82 4 59 77 6 54
42 0 0 79 9 54 16 32 26 35 -27 81 49 46 76 47 24
41 0 0 78 51 20 16 32 29 35 -27 81 33 41 76 27 4
40 0 0 78 31 52 16 32 32 35 -26 81 16 42 76 5 53
39 0 0 78 11 29 16 32 35 34 -26 80 58 45 75 43 50
38 0 0 77 50 9 16 32 38 34 -26 80 39 48 75 20 52
37 0 0 77 27 49 16 32 41 34 -26 80 19 47 74 56 58
36 0 0 77 4 27 16 32 44 34 -26 79 58 38 74 32 7
35 0 0 76 40 1 16 32 48 34 -26 79 36 20 74 6 17
34 0 0 76 14 30 16 32 51 33 -26 79 12 48 73 39 26
33 0 0 75 47 51 16 32 55 33 -25 78 48 1 73 11 35
32 0 0 75 20 3 16 32 59 33 -25 78 21 54 72 42 41
31 0 0 74 51 5 16 33 3 33 -25 77 54 27 72 12 44
30 0 0 74 20 55 16 33 7 32 -25 77 25 36 71 41 43
29 0 0 73 49 33 16 33 11 32 -24 76 55 20 71 9 38
28 0 0 73 16 58 16 33 15 32 -24 76 23 37 70 36 30
27 0 0 72 43 9 16 33 20 31 -24 75 50 27 70 2 16
26 0 0 72 8 8 16 33 24 31 -23 75 15 49 69 26 59
25 0 0 71 31 54 16 33 29 30 -23 74 39 44 68 50 39
24 0 0 70 54 28 16 33 34 30 -23 74 2 11 68 13 16
23 0 0 70 15 51 16 33 38 29 -22 73 23 13 67 34 52
22 0 0 69 36 5 16 33 43 29 -22 72 42 51 66 55 28
21 0 0 68 55 11 16 33 48 28 -22 72 1 7 66 15 5
20 0 0 68 13 12 16 33 53 28 -21 71 18 5 65 33 46
19 0 0 67 30 11 16 33 58 27 -21 70 33 47 64 51 33
18 0 0 66 46 10 16 34 3 27 -20 69 48 17 64 8 27
17 0 0 66 1 11 16 34 8 26 -19 69 1 40 63 24 32
16 0 0 65 15 20 16 34 13 25 -19 68 13 59 62 39 50
15 0 0 64 28 37 16 34 18 25 -18 67 25 20 61 54 25
14 0 0 63 41 9 16 34 23 24 -18 66 35 46 61 8 18
13 0 0 62 52 57 16 34 28 23 -17 65 45 24 60 21 33
12 0 0 62 4 6 16 34 33 23 -16 64 54 17 59 34 13
11 0 0 61 14 40 16 34 38 22 -16 64 2 30 58 46 22
10 0 0 60 24 43 16 34 43 21 -15 63 10 9 57 58 3
9 0 0 59 34 18 16 34 47 20 -14 62 17 18 57 9 19
8 0 0 58 43 30 16 34 52 19 -13 61 24 3 56 20 14
7 0 0 57 52 22 16 34 56 18 -12 60 30 27 55 30 51
6 0 0 57 0 58 16 35 0 17 -12 59 36 35 54 41 13
5 0 0 56 9 23 16 35 4 16 -11 58 42 32 53 51 24
4 0 0 55 17 39 16 35 8 16 -10 57 48 21 53 1 26
3 0 0 54 25 50 16 35 11 15 -9 56 54 7 52 11 24
2 0 0 53 34 0 16 35 15 14 -8 55 59 54 51 21 20
1 0 0 52 42 12 16 35 18 13 -7 55 5 44 50 31 18
0 0 0 51 50 29 16 35 21 12 -6 54 11 43 49 41 20
- 1 0 0 50 58 55 16 35 24 11 -5 53 17 53 48 51 29
- 2 0 0 50 7 33 16 35 26 10 -4 52 24 17 48 1 49
- 3 0 0 49 16 24 16 35 28 8 -3 51 30 59 47 12 21
........................... 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-|
--------------------------------------------------------------------U---U---
Be sure to use the RELOAD button of your browser,
so you will surely use the latest version of predictions page!
