Update for (110) Lydia - September 7/8, 2002 - South Africa
Update computed by Jan Manek; issued 01 Sep 2002 13:15:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(110) Lydia / TYC 6856-00326-1 on September 7/8, 2002
visible from Namibia, Botswana and Zimbabwe
Summary
In the night of September 7/8, 2002 a 10.2 mag star TYC 6856-00326-1
will be occulted by a 89 km asteroid (110) Lydia. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and UCAC1 star position.
The updated path shows ~2.5 path width south shift with time ~0.8 minutes earlier compared to
Edwin Goffin's nominal prediction.
Updated path runs just over very south of South America ~22:41.5 UT and later Namibia ~22:54.5 UT,
Botswana ~22:55.1 UT and Zimbabwe 22:55.6 UT. There are probably no observers there.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: September 7, 2002 @ 22:55 UT (south Africa)
* magnitude of target star: 10.2
* magnitude drop [mag]: 2.3
* estimated maximum duration [s]: 10.6
* path description: given above
* Goffin's original chart reference: A02_0920
The occultation path:
* approximate ground width [km]: 100
* uncertainty [path widths]: 1.3
* uncertainty in time [s]: 15
* 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 6856-00326-1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 18h 17m 23.7331s; -29o 44' 54.100"
* position source: UCAC1
* estimated accuracy ["]: 0.02" (0.02", 0.01")
* V mag [mag]: 10.19
* B-V [mag]: -0.02
* remarks:
Target star is in southwest Sagittarius, about 47' west of 2.7 mag star delta Sagittarii = SAO 186681.
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.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 2.5x2.5 degrees
* limiting magnitude is 12.0
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (110) Lydia
approx. diameter [km]: 89
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 115 USNO, 43 TMO
number of rejected observations: 10 USNO
time covered by the observations: 1998 07 16 - 2002 08 28
rms residuals ["] (RA,DE): 0.08", 0.07"
estimated positional accuracy at epoch of event ["]: 0.06", 0.07"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 22:44.4 UT
* approx. V mag of minor planet at event [mag]: 12.4
* geocentric parallax of minor planet ["]: 4.271
* magnitude drop [mag]: 2.3
* estimated maximum duration [s]: 10.6
* apparent motion of minor planet ["/h]: 20.15
* angular distance to moon, phase of moon [deg,%]: 98, 1%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Sep 07
110 Lydia
22h 44.4m UT
56-00326-1 10.2 18 17 23.733-29 44 54.10TYC 6856-00326-1
12.4 89 10.6 2.059 1.523 3.70
-53.589 -29.750 -161.62 5.86
22.7401 .07400 -.40185 4.63918 0.86534 0.00531 0.00036
2000 322.0128212002 9 3.00000281.74541557.029898 5.972235 0.080226942.733118412.513848677.805 0.20
RATE 2.1813050 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Latitude Latitude
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 ' "
- 76 0 0 -55 44 24 22 40 33 59 -2 -56 10 47 -55 18 6
- 75 0 0 -55 45 12 22 40 40 59 -2 -56 11 34 -55 18 55
- 74 0 0 -55 45 38 22 40 48 60 -3 -56 12 1 -55 19 22
- 73 0 0 -55 45 43 22 40 55 60 -4 -56 12 6 -55 19 27
- 72 0 0 -55 45 27 22 41 2 61 -4 -56 11 49 -55 19 10
- 71 0 0 -55 44 49 22 41 10 61 -5 -56 11 11 -55 18 32
- 70 0 0 -55 43 49 22 41 17 61 -5 -56 10 12 -55 17 31
- 69 0 0 -55 42 28 22 41 25 62 -6 -56 8 51 -55 16 10
- 68 0 0 -55 40 45 22 41 32 62 -6 -56 7 9 -55 14 26
- 67 0 0 -55 38 40 22 41 40 62 -7 -56 5 6 -55 12 20
- 66 0 0 -55 36 14 22 41 47 62 -8 -56 2 40 -55 9 53
- 65 0 0 -55 33 25 22 41 55 63 -8 -55 59 53 -55 7 3
- 64 0 0 -55 30 15 22 42 3 63 -9 -55 56 45 -55 3 51
- 63 0 0 -55 26 43 22 42 10 63 -9 -55 53 14 -55 0 17
- 62 0 0 -55 22 48 22 42 18 63 -10 -55 49 22 -54 56 21
- 61 0 0 -55 18 32 22 42 26 64 -11 -55 45 7 -54 52 2
- 60 0 0 -55 13 53 22 42 34 64 -11 -55 40 30 -54 47 21
- 59 0 0 -55 8 51 22 42 41 64 -12 -55 35 31 -54 42 17
- 58 0 0 -55 3 27 22 42 49 64 -12 -55 30 10 -54 36 50
- 57 0 0 -54 57 40 22 42 57 65 -13 -55 24 25 -54 30 60
- 56 0 0 -54 51 30 22 43 5 65 -14 -55 18 18 -54 24 47
- 55 0 0 -54 44 57 22 43 13 65 -14 -55 11 48 -54 18 11
- 54 0 0 -54 37 60 22 43 21 65 -15 -55 4 55 -54 11 11
........................... shortened .............................
8 0 0 -32 10 36 22 53 17 36 -63 -32 43 30 -31 37 52
9 0 0 -31 33 47 22 53 26 35 -64 -32 6 42 -31 1 2
10 0 0 -30 56 40 22 53 35 34 -64 -31 29 37 -30 23 53
11 0 0 -30 19 16 22 53 43 33 -65 -30 52 14 -29 46 29
12 0 0 -29 41 37 22 53 52 32 -66 -30 14 36 -29 8 49
13 0 0 -29 3 44 22 54 0 31 -67 -29 36 43 -28 30 56
14 0 0 -28 25 39 22 54 9 30 -67 -28 58 38 -27 52 50
15 0 0 -27 47 22 22 54 16 29 -68 -28 20 20 -27 14 34
16 0 0 -27 8 56 22 54 24 28 -69 -27 41 53 -26 36 8
17 0 0 -26 30 21 22 54 32 27 -69 -27 3 17 -25 57 35
18 0 0 -25 51 40 22 54 39 25 -70 -26 24 34 -25 18 55
19 0 0 -25 12 53 22 54 46 24 -70 -25 45 46 -24 40 11
20 0 0 -24 34 3 22 54 53 23 -71 -25 6 53 -24 1 23
21 0 0 -23 55 10 22 54 59 22 -71 -24 27 58 -23 22 33
22 0 0 -23 16 17 22 55 5 21 -72 -23 49 2 -22 43 43
23 0 0 -22 37 25 22 55 11 20 -72 -23 10 7 -22 4 54
24 0 0 -21 58 35 22 55 16 19 -72 -22 31 14 -21 26 7
25 0 0 -21 19 50 22 55 22 18 -72 -21 52 24 -20 47 25
26 0 0 -20 41 9 22 55 27 16 -72 -21 13 40 -20 8 49
27 0 0 -20 2 36 22 55 31 15 -72 -20 35 2 -19 30 20
28 0 0 -19 24 10 22 55 35 14 -72 -19 56 32 -18 51 59
29 0 0 -18 45 55 22 55 39 13 -72 -19 18 11 -18 13 48
30 0 0 -18 7 50 22 55 43 12 -71 -18 40 1 -17 35 49
31 0 0 -17 29 58 22 55 46 11 -71 -18 2 4 -16 58 2
32 0 0 -16 52 19 22 55 49 10 -70 -17 24 20 -16 20 29
33 0 0 -16 14 56 22 55 52 8 -70 -16 46 50 -15 43 11
34 0 0 -15 37 48 22 55 54 7 -69 -16 9 37 -15 6 9
35 0 0 -15 0 58 22 55 56 6 -69 -15 32 41 -14 29 25
36 0 0 -14 24 27 22 55 58 5 -68 -14 56 3 -13 53 0
........................... 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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