Update for (111) Ate - September 9/10, 2000
Update computed by Jan Manek; issued 01 Sep 2000 18:03:20 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(111) Ate / HIP 2559 = SAO 91954 on September 9/10, 2000
visible from N Russia, very S Finland, N Estonia, S Sweden,
N Denmark, Scotland and north of Ireland
Summary
In the night of September 9/10, 2000 a bright 8.4 mag star SAO 91954 =
HIP 2559 will be occulted by a 139 km asteroid (111) Ate. This update
is based on USNO/Flagstaff and TMO astrometry for the asteroid and Hipparcos
star position.
The updated path shows ~0.5 path width north shift with time ~0.9 minutes earlier compared to
Edwin Goffin's nominal prediction.
The path of this occultation runs over N Russia at ~0:36-0:37 UT with Sankt-
Peterburg in path at 0:37.9 UT, S Finland with Helsinki ~0:38.3 UT, N Estonia
with Tallin ~0:38.3 UT, S Sweden with Stockholm ~0:39 UT, N Denmark ~0:39.8
UT, Scotland ~0:41 UT and north of Ireland ~0:39.8 UT. After running over
Atlantic Ocean path hits also USA, running over SE Virginia with Norfolk area
in path, North Carolina and NW South Carolina with time around ~0:49.2 UT.
More to SW the star will too low.
As the target star is rather bright and easy to find, event has large
brightness drop and uncertainity is under 1 path width, it seems this one
is a good opportunity. Please inform also others in your area.
The event at one glimpse:
* date and approx. UT time of event: September 10, 2000 @ 00:40 UT (Europe)
00:49 UT (USA)
* magnitude of target star: 8.4
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 14.8
* path description: given above
* Goffin's original chart reference: A00_0906
The occultation path:
* approximate ground width [km]: 200
* uncertainty [path widths]: 0.9
* uncertainty in time [s]: 15
* map: below
* remarks: Path uncertainities are given according to nominal star
position errors and expected asteroid positional accuracy.
!!!!!!!
Circles along path indicates the centerline for this event.
They are more accurate than the path limit lines.
!!!!!!!
Data for the target star:
* name: HIP 2559 = SAO 91954 = PPM 116558 = TYC 0606-01511-1
* constellation: Pisces
* J2000 position [h,m,s; o,',"]: 00h 32m 31.307s; +10o 29' 11.78"
* position source: Hipparcos
* estimated accuracy ["]: 0.01" (0.01", 0.01")
* V mag [mag]: 8.38
* B-V [mag]: +0.35
* remarks:
Target star is in middle Pisces, about 6.6 degrees SE of 2.8 mag star
gamma Pegasi. There is 6.8 mag star SAO 91971 just 27' SE of target.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 12.5
* labeled stars have indicated SAO numbers
Data for the minor planet:
* general information:
number, name: (111) Ate
approx. diameter [km]: 139
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 41 USNO, 2 TMO
number of rejected observations: 3 USNO, 1 TMO
time covered by the observations: 1998 02 24 - 2000 08 31
rms residuals ["] (RA,DE): 0.09", 0.09"
estimated positional accuracy at epoch of event ["]: 0.09"
remarks: There are 3 this year's positions with well agreement.
Data for the event:
* UT date and time of least geocentric approach: 00:41.5 UT
* approx. V mag of minor planet at event [mag]: 11.9
* geocentric parallax of minor planet ["]: 5.146
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 14.8
* apparent motion of minor planet ["/h]: 27.25
* angular distance to moon, phase of moon [deg,%]: 68, 86%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
........ shortened ..........................
o ' " o ' " h m s o o
54 0 0 61 17 51 0 35 59 30 -8
52 0 0 61 15 48 0 36 8 31 -9
50 0 0 61 12 60 0 36 16 31 -10
48 0 0 61 9 26 0 36 24 32 -10
46 0 0 61 5 8 0 36 33 33 -11
44 0 0 61 0 4 0 36 42 34 -12
42 0 0 60 54 15 0 36 51 34 -13
40 0 0 60 47 40 0 37 0 35 -14
38 0 0 60 40 20 0 37 10 36 -15
36 0 0 60 32 14 0 37 20 36 -15
34 0 0 60 23 22 0 37 29 37 -16
32 0 0 60 13 44 0 37 40 38 -17
30 0 0 60 3 20 0 37 50 38 -18
28 0 0 59 52 10 0 38 0 39 -19
26 0 0 59 40 13 0 38 11 39 -19
24 0 0 59 27 30 0 38 22 40 -20
22 0 0 59 13 59 0 38 33 40 -21
20 0 0 58 59 42 0 38 45 41 -22
19 0 0 58 52 16 0 38 51 41 -22
18 0 0 58 44 38 0 38 56 41 -23
17 0 0 58 36 49 0 39 2 42 -23
16 0 0 58 28 47 0 39 8 42 -23
15 0 0 58 20 34 0 39 14 42 -24
14 0 0 58 12 9 0 39 20 42 -24
13 0 0 58 3 32 0 39 26 42 -24
12 0 0 57 54 44 0 39 33 43 -25
11 0 0 57 45 44 0 39 39 43 -25
10 0 0 57 36 32 0 39 45 43 -25
9 0 0 57 27 8 0 39 51 43 -26
8 0 0 57 17 33 0 39 58 43 -26
7 0 0 57 7 45 0 40 4 43 -26
6 0 0 56 57 47 0 40 11 44 -27
5 0 0 56 47 36 0 40 17 44 -27
4 0 0 56 37 14 0 40 24 44 -27
3 0 0 56 26 41 0 40 30 44 -28
2 0 0 56 15 56 0 40 37 44 -28
1 0 0 56 4 59 0 40 44 44 -28
0 0 0 55 53 52 0 40 51 44 -29
- 1 0 0 55 42 32 0 40 58 44 -29
- 2 0 0 55 31 2 0 41 4 44 -29
- 3 0 0 55 19 20 0 41 11 44 -30
- 4 0 0 55 7 27 0 41 18 44 -30
- 5 0 0 54 55 23 0 41 25 44 -30
- 6 0 0 54 43 8 0 41 32 44 -30
- 7 0 0 54 30 43 0 41 40 44 -31
- 8 0 0 54 18 6 0 41 47 44 -31
- 9 0 0 54 5 19 0 41 54 44 -31
- 10 0 0 53 52 21 0 42 1 44 -31
- 11 0 0 53 39 13 0 42 8 44 -32
- 12 0 0 53 25 54 0 42 16 44 -32
- 13 0 0 53 12 26 0 42 23 44 -32
- 14 0 0 52 58 47 0 42 31 44 -32
........ shortened ..........................
- 70 0 0 37 57 23 0 48 46 17 -22
- 71 0 0 37 41 58 0 48 50 16 -21
- 72 0 0 37 26 41 0 48 54 15 -21
- 73 0 0 37 11 33 0 48 57 15 -20
- 74 0 0 36 56 35 0 49 1 14 -20
- 75 0 0 36 41 47 0 49 4 13 -19
- 76 0 0 36 27 10 0 49 7 12 -18
- 77 0 0 36 12 43 0 49 10 11 -18
- 78 0 0 35 58 28 0 49 13 11 -17
- 79 0 0 35 44 25 0 49 15 10 -16
- 80 0 0 35 30 33 0 49 17 9 -16
- 81 0 0 35 16 54 0 49 20 8 -15
- 82 0 0 35 3 28 0 49 21 7 -14
- 83 0 0 34 50 15 0 49 23 6 -13
- 84 0 0 34 37 15 0 49 25 6 -13
- 85 0 0 34 24 29 0 49 26 5 -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 : jmanek@mbox.vol.cz |-O-O-|
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