Update for (173) Ino - February 7/8, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (173) Ino / TYC 4990-00526-1 on February 7/8, 2003
                  visible from South Africa and Lesotho

Summary 

In the night of February 7/8, 2003 a faint 11.7 mag star TYC 4990-00526-1 will be occulted by a 159 km asteroid (173) Ino. This update is based on USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.

The updated path shows ~2 path width north shift with time 1.1 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over South Africa 1:46.5-1:48.0 UT with Bloemfintein in path and Lesotho ~1.47.5 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: February 8, 2003 @ 01:47 UT
 * magnitude of target star: 11.7
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 12.8
 * path description: given above
 * Goffin's original chart reference: A03_0214

The occultation path:
 * approximate ground width [km]: 170
 * uncertainty [path widths]: 0.6
 * 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 4990-00526-1
 * constellation: Libra
 * J2000 position [h,m,s; o,',"]: 14h 47m 01.8080s; -02o 43' 53.825"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.02" (0.01", 0.02")
 * V mag [mag]: 11.69
 * B-V [mag]: +0.79
 * remarks:
    Target star is in north Libra, about 3.1 degrees north of 3.9 mag star mu Virginis = SAO 140090 or
    1.1 degrees WSW of 4.9 mag star 11 Librae = SAO 140176.
    !!! 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 13.0
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (173) Ino
     approx. diameter [km]: 159
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 95 USNO
     number of rejected observations: 13 USNO
     time covered by the observations: 1998 02 26 - 2002 04 12
     rms residuals ["] (RA,DE): 0.06", 0.06"
     estimated positional accuracy at epoch of event ["]: 0.04", 0.04"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 01:52.2 UT
 * approx. V mag of minor planet at event [mag]: 13.7
 * geocentric parallax of minor planet ["]: 2.917
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 12.8
 * apparent motion of minor planet ["/h]: 20.51
 * angular distance to moon, phase of moon [deg,%]: 168, 37%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Feb 08
173 Ino
 1h 52.2m UT
90-00526-1  11.7   14 47  1.808- 2 43 53.83TYC 4990-00526-1
13.7    159   12.8   3.015     1.280      7.25
   55.933  -2.734   155.49  -15.16
  1.8704   .09535  -.25169  6.57670  2.48155 -0.00574  0.00162
2000    188.5370302003 131.00000228.234264148.36568914.207011 0.208400542.741416222.170103617.665   0.01
RATE 2.1714090 .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
     13  0  0   -32 51 33    1 45 58    39   -31  -33 37 32  -32  5 44
     14  0  0   -32 39 14    1 46  4    40   -31  -33 25 17  -31 53 21
     15  0  0   -32 26 36    1 46  9    40   -30  -33 12 42  -31 40 39
     16  0  0   -32 13 38    1 46 14    41   -30  -32 59 48  -31 27 37
     17  0  0   -32  0 21    1 46 20    42   -29  -32 46 35  -31 14 16
     18  0  0   -31 46 44    1 46 25    43   -29  -32 33  3  -31  0 36
     19  0  0   -31 32 49    1 46 31    44   -28  -32 19 11  -30 46 37
     20  0  0   -31 18 34    1 46 37    45   -28  -32  5  1  -30 32 18
     21  0  0   -31  4  0    1 46 43    46   -27  -31 50 31  -30 17 40
     22  0  0   -30 49  8    1 46 49    46   -27  -31 35 42  -30  2 44
     23  0  0   -30 33 56    1 46 55    47   -26  -31 20 35  -29 47 28
     24  0  0   -30 18 26    1 47  2    48   -26  -31  5  9  -29 31 54
     25  0  0   -30  2 38    1 47  8    49   -25  -30 49 24  -29 16  2
     26  0  0   -29 46 30    1 47 15    50   -25  -30 33 21  -28 59 50
     27  0  0   -29 30  5    1 47 21    51   -24  -30 16 60  -28 43 21
     28  0  0   -29 13 21    1 47 28    52   -24  -30  0 20  -28 26 33
     29  0  0   -28 56 20    1 47 35    53   -23  -29 43 23  -28  9 28
     30  0  0   -28 39  0    1 47 42    53   -22  -29 26  8  -27 52  4
     31  0  0   -28 21 23    1 47 49    54   -22  -29  8 35  -27 34 23
     32  0  0   -28  3 29    1 47 57    55   -21  -28 50 44  -27 16 25
     33  0  0   -27 45 17    1 48  4    56   -21  -28 32 37  -26 58  9
     34  0  0   -27 26 49    1 48 11    57   -20  -28 14 12  -26 39 37
     35  0  0   -27  8  4    1 48 19    58   -19  -27 55 31  -26 20 48
     36  0  0   -26 49  2    1 48 27    59   -19  -27 36 33  -26  1 42
     37  0  0   -26 29 44    1 48 35    60   -18  -27 17 19  -25 42 21
     38  0  0   -26 10 11    1 48 42    60   -17  -26 57 49  -25 22 44
     39  0  0   -25 50 21    1 48 50    61   -17  -26 38  3  -25  2 51
     40  0  0   -25 30 17    1 48 59    62   -16  -26 18  2  -24 42 43
     41  0  0   -25  9 57    1 49  7    63   -15  -25 57 46  -24 22 20
     42  0  0   -24 49 23    1 49 15    64   -15  -25 37 16  -24  1 43
     43  0  0   -24 28 35    1 49 23    65   -14  -25 16 31  -23 40 51
     44  0  0   -24  7 33    1 49 32    65   -13  -24 55 32  -23 19 46
     45  0  0   -23 46 18    1 49 40    66   -12  -24 34 20  -22 58 28
     46  0  0   -23 24 50    1 49 49    67   -12  -24 12 54  -22 36 56
     47  0  0   -23  3  9    1 49 58    68   -11  -23 51 16  -22 15 13
     48  0  0   -22 41 16    1 50  7    68   -10  -23 29 26  -21 53 17
     49  0  0   -22 19 11    1 50 15    69    -9  -23  7 24  -21 31  9
     50  0  0   -21 56 55    1 50 24    70    -9  -22 45 10  -21  8 51
     51  0  0   -21 34 28    1 50 33    71    -8  -22 22 46  -20 46 22
   ........................... 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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