Update for (487) Venetia - August 2, 2002 - South Africa
Update computed by Jan Manek; issued 30 Jul 2002 23:55:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(487) Venetia / TYC 6237-00868-1 on August 2, 2002
visible from South Africa
Summary
In the night of August 2/3, 2002 a 11.0 mag star TYC 6237-00838-1
will be occulted by a 64 km asteroid (487) Venetia. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and UCAC1 star position.
The updated path shows ~1 path width north shift with time ~1.0 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs over south Saudi Arabia and Africa from NE to SW. Only very SE Namibia ~20:10.5 UT,
and west South Africa ~20:11.5 UT is in path from usual sites, but still 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: August 2, 2002 @ 20:11 UT (South Africa)
* magnitude of target star: 11.0
* magnitude drop [mag]: 2.0
* estimated maximum duration [s]: 13.4
* path description: given above
* Goffin's original chart reference: A02_0834
The occultation path:
* approximate ground width [km]: 65
* uncertainty [path widths]: 1.6
* uncertainty in time [s]: 22
* 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 6237-00868-1
* constellation: Ophiuchus
* J2000 position [h,m,s; o,',"]: 17h 12m 45.1736s; -18o 14' 23.193"
* position source: UCAC1
* estimated accuracy ["]: 0.02" (0.015", 0.015")
* V mag [mag]: 11.01
* B-V [mag]: +0.24
* remarks:
Target star is in south Ophiuchus, ~2.6 degrees south of 2.4 mag star eta Ophiuchi = SAO 160332.
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 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: (487) Venetia
approx. diameter [km]: 64
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 112 USNO, 33 TMO
number of rejected observations: 10 USNO, 2 TMO
time covered by the observations: 1998 06 04 - 2002 07 23
rms residuals ["] (RA,DE): 0.06", 0.06"
estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 20:09.5 UT
* approx. V mag of minor planet at event [mag]: 12.8
* geocentric parallax of minor planet ["]: 4.345
* magnitude drop [mag]: 2.0
* estimated maximum duration [s]: 13.4
* apparent motion of minor planet ["/h]: 11.58
* angular distance to moon, phase of moon [deg,%]: 157, 36%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Aug 02
487 Venetia
20h 9.5m UT
37-00868-1 11.0 17 12 45.174-18 14 23.19TYC 6237-00868-1
12.8 64 13.4 2.024 -0.385 -10.38
4.572 -18.237 -120.81 17.64
20.1579 .24840 -.13157 -1.26634 -2.38936 0.00431 -0.00064
2000 247.3266042002 725.00000279.776016115.04082710.232548 0.087234452.670688012.437712028.145 0.15
RATE 2.2582360 .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 40 33 48 19 48 19 5 -31 40 54 30 40 13 4
74 0 0 39 37 21 19 48 24 7 -32 39 58 25 39 16 15
72 0 0 38 36 13 19 48 30 9 -33 38 57 42 38 14 43
70 0 0 37 30 10 19 48 37 11 -35 37 52 3 37 8 13
68 0 0 36 18 53 19 48 47 13 -36 36 41 15 35 56 29
66 0 0 35 2 7 19 48 58 15 -37 35 24 58 34 39 14
64 0 0 33 39 34 19 49 12 17 -39 34 2 55 33 16 9
62 0 0 32 10 54 19 49 28 19 -40 32 34 49 31 46 57
60 0 0 30 35 50 19 49 47 21 -42 31 0 19 30 11 18
58 0 0 28 54 2 19 50 9 24 -43 29 19 8 28 28 54
56 0 0 27 5 13 19 50 34 26 -45 27 30 56 26 39 25
54 0 0 25 9 3 19 51 2 29 -46 25 35 27 24 42 36
52 0 0 23 5 18 19 51 34 31 -48 23 32 23 22 38 8
50 0 0 20 53 42 19 52 11 34 -49 21 21 30 20 25 49
48 0 0 18 34 5 19 52 51 37 -51 19 2 37 18 5 27
46 0 0 16 6 18 19 53 36 40 -52 16 35 36 15 36 54
44 0 0 13 30 18 19 54 25 43 -54 14 0 23 13 0 6
42 0 0 10 46 6 19 55 20 46 -55 11 17 0 10 15 5
40 0 0 7 53 50 19 56 19 49 -56 8 25 34 7 21 59
38 0 0 4 53 43 19 57 23 52 -57 5 26 18 4 21 1
36 0 0 1 46 7 19 58 33 55 -58 2 19 33 1 12 32
34 0 0 - 1 28 30 19 59 47 59 -58 - 0 54 12 - 2 2 58
32 0 0 - 4 49 32 20 1 5 62 -59 - 4 14 21 - 5 24 55
30 0 0 - 8 16 16 20 2 27 65 -58 - 7 40 10 - 8 52 34
28 0 0 -11 47 47 20 3 53 68 -58 -11 10 47 -12 25 3
26 0 0 -15 23 7 20 5 21 70 -57 -14 45 12 -16 1 19
24 0 0 -19 1 7 20 6 51 72 -56 -18 22 17 -19 40 16
22 0 0 -22 40 29 20 8 22 73 -55 -22 0 46 -23 20 35
20 0 0 -26 19 51 20 9 53 73 -53 -25 39 15 -27 0 50
18 0 0 -29 57 41 20 11 24 73 -51 -29 16 16 -30 39 31
16 0 0 -33 32 23 20 12 52 71 -49 -32 50 15 -34 14 59
14 0 0 -37 2 19 20 14 17 69 -47 -36 19 35 -37 45 34
12 0 0 -40 25 52 20 15 38 67 -45 -39 42 40 -41 9 36
........................... 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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