Update for (177) Irma - January 16/17, 2003
Update computed by Jan Manek; issued 05 Jan 2003 20:09 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(177) Irma / TYC 1375-00220-1 on January 16/17, 2003
visible from Bulgaria, SW Romania, NE Serbia, SW Hungary, Austria,
SW Czechia, Germany, Netherlands, Scotland, Greenland, N Canada and Alaska
Summary
In the night of January 16/17, 2003 a faint 12.1 mag star TYC 1375-00220-1
will be occulted by a 75 km asteroid (177) Irma. This update is based on
USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.
The updated path shows ~5 path width north shift with time 0.8 minutes earlier compared to
Edwin Goffin's nominal prediction.
Updated path runs over Bulgaria ~4:29.6 UT, SW Romania ~4:29.8 UT, NE Serbia ~4:29.9 UT, SW Hungary ~4:30.1 UT,
Austria just west of Vienna ~4:30.3 UT, SW Czechia ~4:30.6 UT, Germany from SE to NW around 4:30.8 UT,
Netherlands ~4:31.0 UT, Scotland ~4:32.0 UT, Greenland ~4:35 UT, N Canada 4:37-4:39 UT and Alaska ~4:40 UT.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: January 17, 2003 @ 04:30 UT (Europe)
* magnitude of target star: 12.1
* magnitude drop [mag]: 1.2
* estimated maximum duration [s]: 6.3
* path description: given above
* Goffin's original chart reference: A03_0122
The occultation path:
* approximate ground width [km]: 115
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 7
* 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 1375-00220-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 07h 58m 43.9170s; +22o 23' 54.011"
* position source: recent UCAC position combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.02" (0.01", 0.01")
* V mag [mag]: 12.10
* B-V [mag]: +0.77
* remarks:
Target star is in east Gemini, about 3.8 degrees SE of 3.6 mag star kappa Geminorum = SAO 97908.
Close to border with Cancer.
!!! IMPORTANT !!!
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 3.0x3.0 degrees
* limiting magnitude is 13.5
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (177) Irma
approx. diameter [km]: 75
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 92 USNO
number of rejected observations: 17 USNO
time covered by the observations: 1998 12 27 - 2002 12 20
rms residuals ["] (RA,DE): 0.08", 0.10"
estimated positional accuracy at epoch of event ["]: 0.06", 0.08"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 04:35.1 UT
* approx. V mag of minor planet at event [mag]: 12.8
* geocentric parallax of minor planet ["]: 5.343
* magnitude drop [mag]: 1.2
* estimated maximum duration [s]: 6.3
* apparent motion of minor planet ["/h]: 36.02
* angular distance to moon, phase of moon [deg,%]: 16, 98%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2003 Jan 17
177 Irma
4h 35.1m UT
75-00220-1 12.1 7 58 43.917 22 23 54.01TYC 1375-00220-1
12.8 75 6.3 1.646 -2.559 6.15
-65.298 22.398 113.69 -20.83
4.5857 .12596 .72641 -6.64585 1.15226 -0.00009 -0.00016
2000 62.89240882003 111.0000038.405382 347.7160031.395510 0.234332622.772627842.122910699.495 0.15
RATE 2.1348468 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
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 ' "
Latitude Latitude
34 0 0 38 34 26 4 29 17 8 -6 39 9 26 37 59 52
33 0 0 39 2 53 4 29 18 9 -7 39 38 2 38 28 12
32 0 0 39 31 33 4 29 20 10 -8 40 6 49 38 56 44
31 0 0 40 0 23 4 29 23 11 -9 40 35 48 39 25 27
30 0 0 40 29 24 4 29 25 11 -10 41 4 56 39 54 20
29 0 0 40 58 33 4 29 28 12 -11 41 34 13 40 23 22
28 0 0 41 27 51 4 29 30 13 -11 42 3 38 40 52 32
27 0 0 41 57 15 4 29 33 14 -12 42 33 10 41 21 49
26 0 0 42 26 46 4 29 36 15 -13 43 2 48 41 51 13
25 0 0 42 56 21 4 29 40 16 -14 43 32 30 42 20 41
24 0 0 43 26 0 4 29 43 17 -15 44 2 17 42 50 13
23 0 0 43 55 42 4 29 47 17 -16 44 32 6 43 19 49
22 0 0 44 25 26 4 29 50 18 -16 45 1 56 43 49 27
21 0 0 44 55 11 4 29 54 19 -17 45 31 48 44 19 5
20 0 0 45 24 56 4 29 58 20 -18 46 1 39 44 48 44
19 0 0 45 54 39 4 30 2 21 -19 46 31 28 45 18 21
18 0 0 46 24 20 4 30 6 21 -20 47 1 16 45 47 57
17 0 0 46 53 58 4 30 11 22 -20 47 30 59 46 17 29
16 0 0 47 23 32 4 30 15 23 -21 48 0 38 46 46 58
15 0 0 47 53 0 4 30 19 24 -22 48 30 12 47 16 21
14 0 0 48 22 23 4 30 24 24 -22 48 59 39 47 45 39
13 0 0 48 51 38 4 30 29 25 -23 49 28 59 48 14 49
12 0 0 49 20 45 4 30 34 26 -24 49 58 10 48 43 52
11 0 0 49 49 43 4 30 38 26 -25 50 27 12 49 12 47
10 0 0 50 18 31 4 30 43 27 -25 50 56 4 49 41 31
9 0 0 50 47 8 4 30 48 28 -26 51 24 44 50 10 5
8 0 0 51 15 34 4 30 53 28 -26 51 53 13 50 38 28
7 0 0 51 43 47 4 30 58 29 -27 52 21 29 51 6 39
6 0 0 52 11 47 4 31 4 29 -28 52 49 31 51 34 36
5 0 0 52 39 32 4 31 9 30 -28 53 17 19 52 2 20
4 0 0 53 7 3 4 31 14 31 -29 53 44 51 52 29 49
3 0 0 53 34 18 4 31 19 31 -29 54 12 7 52 57 4
2 0 0 54 1 17 4 31 25 32 -30 54 39 7 53 24 2
1 0 0 54 27 60 4 31 30 32 -30 55 5 50 53 50 44
0 0 0 54 54 24 4 31 35 33 -31 55 32 15 54 17 8
- 1 0 0 55 20 31 4 31 41 33 -31 55 58 21 54 43 15
- 2 0 0 55 46 18 4 31 46 34 -32 56 24 8 55 9 3
- 3 0 0 56 11 47 4 31 51 34 -32 56 49 35 55 34 33
- 4 0 0 56 36 56 4 31 57 35 -33 57 14 43 55 59 43
- 5 0 0 57 1 44 4 32 2 35 -33 57 39 29 56 24 34
- 6 0 0 57 26 13 4 32 8 35 -34 58 3 55 56 49 4
- 7 0 0 57 50 20 4 32 13 36 -34 58 27 60 57 13 13
- 8 0 0 58 14 5 4 32 18 36 -34 58 51 43 57 37 2
- 9 0 0 58 37 30 4 32 24 37 -35 59 15 4 58 0 29
- 10 0 0 59 0 32 4 32 29 37 -35 59 38 2 58 23 35
- 11 0 0 59 23 12 4 32 34 37 -35 60 0 39 58 46 19
- 12 0 0 59 45 30 4 32 39 38 -36 60 22 52 59 8 41
- 13 0 0 60 7 25 4 32 45 38 -36 60 44 43 59 30 40
........................... shortened .............................
-127 0 0 69 51 3 4 39 0 31 -30 70 23 21 69 19 7
-128 0 0 69 42 56 4 39 3 31 -29 70 15 20 69 10 54
-129 0 0 69 34 33 4 39 5 30 -29 70 7 4 69 2 24
-130 0 0 69 25 53 4 39 8 30 -29 69 58 31 68 53 37
-131 0 0 69 16 57 4 39 11 30 -29 69 49 42 68 44 34
-132 0 0 69 7 43 4 39 13 29 -28 69 40 36 68 35 13
-133 0 0 68 58 13 4 39 16 29 -28 69 31 13 68 25 35
-134 0 0 68 48 24 4 39 18 29 -28 69 21 32 68 15 40
-135 0 0 68 38 18 4 39 21 28 -27 69 11 34 68 5 27
-136 0 0 68 27 55 4 39 24 28 -27 69 1 18 67 54 55
-137 0 0 68 17 12 4 39 26 28 -27 68 50 43 67 44 5
-138 0 0 68 6 11 4 39 29 27 -26 68 39 50 67 32 57
-139 0 0 67 54 52 4 39 32 27 -26 68 28 38 67 21 29
-140 0 0 67 43 13 4 39 34 27 -26 68 17 8 67 9 43
-141 0 0 67 31 14 4 39 37 26 -25 68 5 17 66 57 37
-142 0 0 67 18 56 4 39 40 26 -25 67 53 8 66 45 11
-143 0 0 67 6 18 4 39 42 26 -25 67 40 38 66 32 25
-144 0 0 66 53 20 4 39 45 25 -24 67 27 48 66 19 19
-145 0 0 66 40 1 4 39 48 25 -24 67 14 37 66 5 52
-146 0 0 66 26 22 4 39 50 25 -24 67 1 6 65 52 4
-147 0 0 66 12 21 4 39 53 24 -23 66 47 14 65 37 56
-148 0 0 65 57 59 4 39 56 24 -23 66 32 60 65 23 26
-149 0 0 65 43 16 4 39 58 23 -22 66 18 24 65 8 34
-150 0 0 65 28 10 4 40 1 23 -22 66 3 27 64 53 21
-151 0 0 65 12 43 4 40 3 22 -21 65 48 8 64 37 46
-152 0 0 64 56 53 4 40 6 22 -21 65 32 26 64 21 48
-153 0 0 64 40 40 4 40 9 22 -21 65 16 21 64 5 28
-154 0 0 64 24 5 4 40 11 21 -20 64 59 54 63 48 45
-155 0 0 64 7 7 4 40 14 21 -20 64 43 4 63 31 40
-156 0 0 63 49 45 4 40 16 20 -19 64 25 50 63 14 11
-157 0 0 63 32 1 4 40 19 20 -19 64 8 13 62 56 19
-158 0 0 63 13 53 4 40 21 19 -18 63 50 12 62 38 4
-159 0 0 62 55 21 4 40 24 19 -18 63 31 47 62 19 25
-160 0 0 62 36 25 4 40 26 18 -17 63 12 59 62 0 23
-161 0 0 62 17 6 4 40 29 18 -17 62 53 46 61 40 57
-162 0 0 61 57 22 4 40 31 17 -16 62 34 9 61 21 7
-163 0 0 61 37 15 4 40 33 17 -16 62 14 8 61 0 53
-164 0 0 61 16 43 4 40 36 16 -15 61 53 43 60 40 16
-165 0 0 60 55 48 4 40 38 15 -15 61 32 54 60 19 15
-166 0 0 60 34 29 4 40 40 15 -14 61 11 40 59 57 50
-167 0 0 60 12 45 4 40 42 14 -13 60 50 2 59 36 2
-168 0 0 59 50 38 4 40 44 14 -13 60 27 60 59 13 50
-169 0 0 59 28 7 4 40 46 13 -12 60 5 34 58 51 14
-170 0 0 59 5 13 4 40 48 12 -12 59 42 44 58 28 15
-171 0 0 58 41 55 4 40 50 12 -11 59 19 30 58 4 54
........................... 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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