Update for (972) Cohnia - October 21/22, 2001
Update computed by Jan Manek; issued 17 Oct 2000 23:30:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(972) Cohnia / TYC 02356-01537-1 on October 21/22, 2001
visible from Ukraine, very SE Poland, N Slovakia, Czechia,
mid Germany, Belgium, very N France and Florida
Summary
In the night of October 21/22, 2001 a 10.8 mag star TYC 02356-01537-1 will be
occulted by a 79 km asteroid (972) Cohnia. This update is based on USNO/Flagstaff
and TMO astrometry for the asteroid and Tycho-2 star position.
The updated path shows large ~0.6" north shift with time ~4.0 minutes later
compared to
Edwin Goffin's nominal prediction.
Updated path runs oven Ukraine ~2:44-2:47 UT and the rans along Slovak-Polish border
~02:47.5 UT, Czechia 02:48.5 UT, mid Germany ~21:49.6 UT, Luxembourg and Belgium ~02:50.5 UT,
north tip of France at 02:51 UT and very SW tip of Cornwall at ~02:52.5 UT. Later then path
hits south Florida ~03:10 UT and south Mexico with Yucatan ~03:12-03:13 UT.
Please check the path chart for details.
Although uncertainty is almost 2 path widths and star is faint, I consider this
event as rather promising. Those having larger telescopes should try to monitor this event.
The event at one glimpse:
* date and approx. UT time of event: October 22, 2001 @ 02:49 UT (Euro)
03:10 UT (Florida)
* magnitude of target star: 10.8
* magnitude drop [mag]: 2.5
* estimated maximum duration [s]: 14.3
* path description: given above
* Goffin's original chart reference: A01_1047
The occultation path:
* approximate ground width [km]: 85
* uncertainty [path widths]: 1.9
* uncertainty in time [s]: 30
* map: below
* remarks: Path uncertainities are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: TYC 02356-01537-1
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 03h 52m 25.504s; +30o 54' 25.68"
* position source: Tycho-2
* estimated accuracy ["]: 0.09" (0.06", 0.07")
* V mag [mag]: 10.84
* B-V [mag]: +1.48
* remarks:
Target star is in NE Taurus, close to border with Perseus. Star should be
easy to find as it north of M45 and only 1 degree SW of 2.9 mag star
zeta Persei = SAO 56799. Target star is 16' south of 6.2 mag star SAO 56762.
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: (972) Cohnia
approx. diameter [km]: 79
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 79 USNO, 6 TMO
number of rejected observations: 13 USNO, 1 TMO
time covered by the observations: 1998 01 29 - 2001 10 08
rms residuals ["] (RA,DE): 0.10", 0.10"
estimated positional accuracy at epoch of event ["]: 0.09", 0.06"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 02:55.9 UT
* approx. V mag of minor planet at event [mag]: 13.2
* geocentric parallax of minor planet ["]: 5.619
* magnitude drop [mag]: 2.5
* estimated maximum duration [s]: 14.3
* apparent motion of minor planet ["/h]: 17.58
* angular distance to moon, phase of moon [deg,%]: 145, 31%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Latitude Latitude
Centre Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
48 0 0 44 39 11 2 42 37 41 -6 45 2 59 44 15 26
47 0 0 44 55 4 2 42 47 42 -7 45 18 49 44 31 23
46 0 0 45 10 31 2 42 57 42 -7 45 34 12 44 46 54
45 0 0 45 25 32 2 43 8 43 -8 45 49 8 45 1 58
44 0 0 45 40 6 2 43 18 44 -9 46 3 39 45 16 36
43 0 0 45 54 15 2 43 28 44 -9 46 17 44 45 30 49
42 0 0 46 7 58 2 43 39 45 -10 46 31 24 45 44 35
41 0 0 46 21 15 2 43 49 46 -11 46 44 38 45 57 56
40 0 0 46 34 8 2 43 60 46 -11 46 57 27 46 10 52
39 0 0 46 46 35 2 44 10 47 -12 47 9 51 46 23 23
38 0 0 46 58 38 2 44 21 48 -13 47 21 51 46 35 29
37 0 0 47 10 17 2 44 32 48 -13 47 33 26 46 47 10
36 0 0 47 21 31 2 44 42 49 -14 47 44 37 46 58 27
35 0 0 47 32 20 2 44 53 49 -15 47 55 24 47 9 20
34 0 0 47 42 46 2 45 4 50 -15 48 5 47 47 19 49
33 0 0 47 52 49 2 45 15 51 -16 48 15 47 47 29 54
32 0 0 48 2 27 2 45 25 51 -17 48 25 23 47 39 35
31 0 0 48 11 43 2 45 36 52 -17 48 34 36 47 48 53
30 0 0 48 20 35 2 45 47 53 -18 48 43 25 47 57 48
29 0 0 48 29 5 2 45 58 53 -19 48 51 52 48 6 20
28 0 0 48 37 11 2 46 9 54 -19 48 59 57 48 14 28
27 0 0 48 44 55 2 46 20 54 -20 49 7 38 48 22 14
26 0 0 48 52 17 2 46 31 55 -20 49 14 58 48 29 38
25 0 0 48 59 16 2 46 42 55 -21 49 21 55 48 36 39
24 0 0 49 5 53 2 46 53 56 -22 49 28 30 48 43 18
23 0 0 49 12 8 2 47 4 57 -22 49 34 43 48 49 35
22 0 0 49 18 1 2 47 15 57 -23 49 40 35 48 55 29
21 0 0 49 23 32 2 47 27 58 -23 49 46 4 49 1 2
20 0 0 49 28 41 2 47 38 58 -24 49 51 12 49 6 13
19 0 0 49 33 29 2 47 49 59 -25 49 55 59 49 11 2
18 0 0 49 37 56 2 48 0 59 -25 50 0 24 49 15 30
17 0 0 49 42 1 2 48 12 60 -26 50 4 28 49 19 37
16 0 0 49 45 45 2 48 23 60 -26 50 8 11 49 23 22
15 0 0 49 49 8 2 48 34 61 -27 50 11 33 49 26 46
14 0 0 49 52 10 2 48 46 61 -28 50 14 34 49 29 48
13 0 0 49 54 50 2 48 57 62 -28 50 17 14 49 32 30
12 0 0 49 57 10 2 49 8 62 -29 50 19 33 49 34 50
11 0 0 49 59 9 2 49 20 63 -29 50 21 31 49 36 49
10 0 0 50 0 47 2 49 31 63 -30 50 23 9 49 38 28
9 0 0 50 2 4 2 49 43 64 -30 50 24 26 49 39 45
8 0 0 50 3 1 2 49 55 64 -31 50 25 22 49 40 42
7 0 0 50 3 37 2 50 6 65 -32 50 25 58 49 41 18
6 0 0 50 3 52 2 50 18 65 -32 50 26 13 49 41 33
5 0 0 50 3 46 2 50 30 66 -33 50 26 7 49 41 27
4 0 0 50 3 20 2 50 41 66 -33 50 25 41 49 41 1
3 0 0 50 2 33 2 50 53 66 -34 50 24 54 49 40 14
2 0 0 50 1 25 2 51 5 67 -34 50 23 47 49 39 5
1 0 0 49 59 57 2 51 17 67 -35 50 22 19 49 37 37
0 0 0 49 58 7 2 51 29 68 -35 50 20 31 49 35 47
- 1 0 0 49 55 58 2 51 41 68 -36 50 18 22 49 33 36
- 2 0 0 49 53 27 2 51 53 68 -37 50 15 52 49 31 5
- 3 0 0 49 50 35 2 52 5 69 -37 50 13 1 49 28 12
- 4 0 0 49 47 23 2 52 17 69 -38 50 9 50 49 24 59
- 5 0 0 49 43 50 2 52 29 69 -38 50 6 18 49 21 25
- 6 0 0 49 39 56 2 52 41 70 -39 50 2 25 49 17 29
- 7 0 0 49 35 41 2 52 54 70 -39 49 58 11 49 13 13
- 8 0 0 49 31 4 2 53 6 70 -40 49 53 36 49 8 35
- 9 0 0 49 26 7 2 53 18 71 -40 49 48 40 49 3 36
- 10 0 0 49 20 48 2 53 31 71 -41 49 43 23 48 58 16
- 11 0 0 49 15 8 2 53 43 71 -41 49 37 45 48 52 34
- 12 0 0 49 9 6 2 53 56 71 -42 49 31 45 48 46 31
- 13 0 0 49 2 43 2 54 8 72 -43 49 25 24 48 40 6
- 14 0 0 48 55 58 2 54 21 72 -43 49 18 41 48 33 19
- 15 0 0 48 48 52 2 54 34 72 -44 49 11 36 48 26 10
- 16 0 0 48 41 24 2 54 47 72 -44 49 4 10 48 18 40
- 17 0 0 48 33 33 2 54 59 72 -45 48 56 22 48 10 47
........................... shortened .............................
- 76 0 0 28 39 41 3 9 5 42 -61 29 5 53 28 13 32
- 77 0 0 28 6 35 3 9 19 41 -60 28 32 50 27 40 24
- 78 0 0 27 33 7 3 9 32 40 -60 27 59 24 27 6 54
- 79 0 0 26 59 18 3 9 46 39 -59 27 25 37 26 33 3
- 80 0 0 26 25 8 3 9 59 38 -59 26 51 29 25 58 51
- 81 0 0 25 50 38 3 10 12 37 -58 26 17 1 25 24 19
- 82 0 0 25 15 49 3 10 25 36 -58 25 42 14 24 49 28
- 83 0 0 24 40 41 3 10 37 35 -57 25 7 7 24 14 19
- 84 0 0 24 5 15 3 10 50 34 -57 24 31 43 23 38 52
- 85 0 0 23 29 32 3 11 2 33 -56 23 56 1 23 3 7
- 86 0 0 22 53 33 3 11 14 32 -55 23 20 3 22 27 7
- 87 0 0 22 17 18 3 11 25 31 -54 22 43 50 21 50 51
- 88 0 0 21 40 49 3 11 37 30 -54 22 7 21 21 14 21
- 89 0 0 21 4 6 3 11 48 28 -53 21 30 39 20 37 37
- 90 0 0 20 27 10 3 11 58 27 -52 20 53 44 20 0 41
- 91 0 0 19 50 3 3 12 9 26 -51 20 16 36 19 23 33
- 92 0 0 19 12 45 3 12 19 25 -51 19 39 18 18 46 15
- 93 0 0 18 35 17 3 12 28 24 -50 19 1 50 18 8 47
- 94 0 0 17 57 40 3 12 38 23 -49 18 24 14 17 31 10
- 95 0 0 17 19 56 3 12 47 22 -48 17 46 29 16 53 26
- 96 0 0 16 42 5 3 12 55 21 -47 17 8 38 16 15 36
- 97 0 0 16 4 9 3 13 3 20 -46 16 30 41 15 37 41
- 98 0 0 15 26 8 3 13 11 19 -45 15 52 39 14 59 41
- 99 0 0 14 48 5 3 13 19 17 -44 15 14 35 14 21 38
-100 0 0 14 9 59 3 13 25 16 -43 14 36 28 13 43 34
-101 0 0 13 31 53 3 13 32 15 -42 13 58 21 13 5 29
-102 0 0 12 53 47 3 13 38 14 -41 13 20 14 12 27 25
-103 0 0 12 15 43 3 13 44 13 -40 12 42 8 11 49 23
-104 0 0 11 37 42 3 13 49 12 -39 12 4 5 11 11 23
-105 0 0 10 59 45 3 13 54 11 -38 11 26 6 10 33 29
-106 0 0 10 21 54 3 13 58 10 -37 10 48 12 9 55 39
-107 0 0 9 44 9 3 14 2 8 -36 10 10 25 9 17 56
........................... 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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