Update for (500) Selinur - June 25/26, 2002
Update computed by Jan Manek; issued 16 Jun 2002 17:30:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(500) Selinur / TYC 6840-00799-1 on June 25/26 2002
visible from SE Asia, India, Arabia, middle East and Greece
Summary
In night of June 25/26, 2002 a faint 11.7 mag star TYC 6840-00799-1
will be occulted by a 45 km asteroid (500) Selinur. This update is based on
USNO/Flagstaff astrometry for the asteroid and UCAC1 star position.
The updated path shows ~8 path width south shift with time ~0.4 minutes earlier compared to
Edwin Goffin's nominal prediction.
Updated path runs over SE Asia around 20:05 UT, follows India around 20:08.2 UT
about one path width north of Madras and Bangalore, Saudi Arabia around 20:15 UT,
Sinai ~20:14.6 UT, Alexandria ~20:15.0 UT, Crete ~20:15.5 UT, SW Greece ~20:15.9 UT,
and grazes very SE coast of Italy ~20:16.2 UT during its path over sea. Later in NE
Italy, W Austria and E Switzerland the star is probably too low for reliable observation.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: June 25, 2002 @ 20:08 UT (India)
20:16 UT (Europe)
* magnitude of target star: 11.7
* magnitude drop [mag]: 1.4
* estimated maximum duration [s]: 3.9
* path description: given above
* Goffin's original chart reference: A02_0633
The occultation path:
* approximate ground width [km]: 70
* uncertainty [path widths]: 1.9
* uncertainty in time [s]: 8
* 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 6840-00799-1
* constellation: Sagittarius
* J2000 position [h,m,s; o,',"]: 17h 46m 54.1450s; -29o 02' 12.221"
* position source: UCAC1
* estimated accuracy ["]: 0.02" (0.015", 0.015")
* V mag [mag]: 11.74
* B-V [mag]: +0.18
* remarks:
Target star is in SW Sagittarius, about 4.3 degrees northwest of 3.6 mag star gamma2
Sagittarii = SAO 209696. About 1.2 degrees north of target is 4.6 mag star SAO 185755.
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 2.5x2.5 degrees
* limiting magnitude is 13.0
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (500) Selinur
approx. diameter [km]: 45
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 85 USNO
number of rejected observations: 5 USNO
time covered by the observations: 1998 06 18 - 2002 06 09
rms residuals ["] (RA,DE): 0.09", 0.09"
estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 20:10.3 UT
* approx. V mag of minor planet at event [mag]: 12.7
* geocentric parallax of minor planet ["]: 5.569
* magnitude drop [mag]: 1.4
* estimated maximum duration [s]: 3.9
* apparent motion of minor planet ["/h]: 36.05
* angular distance to moon, phase of moon [deg,%]: 19, 99%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Jun 25
500 Selinur
20h 10.3m UT
40-00799-1 11.7 17 46 54.145-29 2 12.22TYC 6840-00799-1
12.7 45 3.9 1.579 -2.631 10.45
50.363 -29.039 -121.90 23.38
20.1714 .21242 .70166 -6.19733 1.87641 0.00066 0.00052
2000 281.9115722002 625.0000073.990210 290.2397829.762945 0.145989452.613349692.231828229.305 0.15
RATE 2.3329630 .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 ' "
120 0 0 23 3 50 20 4 4 6 -15 23 24 34 22 43 14
118 0 0 22 5 54 20 4 8 8 -17 22 26 20 21 45 36
116 0 0 21 11 19 20 4 13 10 -19 21 31 29 20 51 18
114 0 0 20 20 6 20 4 19 12 -21 20 40 0 20 0 20
112 0 0 19 32 14 20 4 26 14 -23 19 51 54 19 12 43
110 0 0 18 47 43 20 4 33 16 -25 19 7 9 18 28 24
108 0 0 18 6 30 20 4 42 18 -27 18 25 44 17 47 24
106 0 0 17 28 36 20 4 51 20 -29 17 47 39 17 9 40
104 0 0 16 53 58 20 5 1 22 -31 17 12 51 16 35 12
102 0 0 16 22 36 20 5 11 24 -32 16 41 19 16 3 59
100 0 0 15 54 28 20 5 23 25 -34 16 13 3 15 35 59
98 0 0 15 29 33 20 5 35 27 -36 15 48 1 15 11 11
96 0 0 15 7 49 20 5 48 28 -37 15 26 11 14 49 34
94 0 0 14 49 16 20 6 1 30 -39 15 7 32 14 31 6
92 0 0 14 33 52 20 6 15 31 -40 14 52 3 14 15 46
90 0 0 14 21 36 20 6 29 33 -42 14 39 44 14 3 34
88 0 0 14 12 27 20 6 44 34 -43 14 30 32 13 54 28
86 0 0 14 6 24 20 6 59 35 -44 14 24 27 13 48 27
84 0 0 14 3 27 20 7 15 37 -45 14 21 29 13 45 32
82 0 0 14 3 36 20 7 31 38 -46 14 21 37 13 45 40
80 0 0 14 6 48 20 7 48 39 -47 14 24 50 13 48 52
78 0 0 14 13 5 20 8 4 40 -48 14 31 9 13 55 8
76 0 0 14 22 26 20 8 22 40 -49 14 40 32 14 4 27
74 0 0 14 34 51 20 8 39 41 -49 14 52 60 14 16 49
72 0 0 14 50 20 20 8 57 42 -50 15 8 32 14 32 14
70 0 0 15 8 53 20 9 15 42 -50 15 27 10 14 50 42
68 0 0 15 30 30 20 9 33 42 -50 15 48 52 15 12 14
66 0 0 15 55 11 20 9 51 43 -50 16 13 40 15 36 49
64 0 0 16 22 57 20 10 10 43 -50 16 41 33 16 4 28
62 0 0 16 53 49 20 10 28 43 -50 17 12 33 16 35 12
60 0 0 17 27 45 20 10 47 43 -49 17 46 38 17 8 60
58 0 0 18 4 48 20 11 5 42 -49 18 23 51 17 45 52
56 0 0 18 44 57 20 11 24 42 -48 19 4 10 18 25 50
54 0 0 19 28 12 20 11 43 41 -47 19 47 37 19 8 53
52 0 0 20 14 33 20 12 1 41 -46 20 34 11 19 55 2
50 0 0 21 4 0 20 12 19 40 -45 21 23 53 20 44 16
48 0 0 21 56 34 20 12 38 39 -44 22 16 42 21 36 35
46 0 0 22 52 13 20 12 55 38 -43 23 12 37 22 31 58
44 0 0 23 50 57 20 13 13 37 -41 24 11 38 23 30 25
42 0 0 24 52 44 20 13 30 36 -40 25 13 43 24 31 55
40 0 0 25 57 33 20 13 47 34 -38 26 18 52 25 36 24
38 0 0 27 5 21 20 14 3 33 -36 27 27 0 26 43 52
36 0 0 28 16 5 20 14 19 31 -35 28 38 6 27 54 14
34 0 0 29 29 41 20 14 34 30 -33 29 52 6 29 7 28
32 0 0 30 46 6 20 14 49 28 -31 31 8 55 30 23 29
30 0 0 32 5 13 20 15 3 26 -29 32 28 28 31 42 11
28 0 0 33 26 55 20 15 16 25 -27 33 50 37 33 3 27
26 0 0 34 51 5 20 15 28 23 -25 35 15 15 34 27 10
24 0 0 36 17 34 20 15 39 21 -23 36 42 13 35 53 11
22 0 0 37 46 10 20 15 49 19 -21 38 11 19 37 21 18
20 0 0 39 16 42 20 15 59 17 -19 39 42 21 38 51 20
18 0 0 40 48 55 20 16 7 15 -17 41 15 6 40 23 3
16 0 0 42 22 34 20 16 14 13 -14 42 49 16 41 56 11
14 0 0 43 57 21 20 16 20 10 -12 44 24 35 43 30 27
12 0 0 45 32 57 20 16 25 8 -10 46 0 43 45 5 33
10 0 0 47 9 2 20 16 29 6 -8 47 37 19 46 41 7
........................... 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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