Update for (393) Lampetia - January 27/28, 2003 - South Africa

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (393) Lampetia / TYC 4882-01689-1 on January 27/28, 2003
      visible from S Mosambique, NE South Africa, Botswana and N Namibia

Summary 

In the night of January 27/28, 2003 a faint 12.5 mag star TYC 4882-01689-1 will be occulted by a 106 km asteroid (393) Lampetia. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

The updated path shows ~1 path width north shift with time 0.9 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over S Mosambique ~20:41.1 UT, NE South Africa ~20:41.5 UT, Botswana ~20:42 UT and N Namibia ~20:42.7 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 27, 2003 @ 20:42 UT (S.Africa)
 * magnitude of target star: 12.5
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 6.3
 * path description: given above
 * Goffin's original chart reference: A03_0137

The occultation path:
 * approximate ground width [km]: 120
 * uncertainty [path widths]: 1.3
 * 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 4882-01689-1
 * constellation: Hydra
 * J2000 position [h,m,s; o,',"]: 09h 03m 53.6823s; -03o 37' 50.866"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.03" (0.02", 0.02")
 * V mag [mag]: 12.47
 * B-V [mag]: +0.07
 * remarks:
    Target star is in north Hydra, about 8.0 degrees northwest of 2.0 mag star alpha Hydrae = SAO 136871.
    Target star is only 47" west of 11.1 mag star GSC 4882-1541.
    !!! 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 12.5
 * labeled stars have indicated SAO numbers
 * remarks: Second chart with lmg 15.1 mag is more detailed to show correctly the target star.








Data for the minor planet:
 * general information:
     number, name: (393) Lampetia
     approx. diameter [km]: 106
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 92 USNO, 4 TMO
     number of rejected observations: 8 USNO
     time covered by the observations: 1998 03 02 - 2003 01 15
     rms residuals ["] (RA,DE): 0.08", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 20:39.2 UT
 * approx. V mag of minor planet at event [mag]: 13.9
 * geocentric parallax of minor planet ["]: 3.218
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 6.3
 * apparent motion of minor planet ["/h]: 30.42
 * angular distance to moon, phase of moon [deg,%]: 109, 23%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Jan 27
393 Lampetia
20h 39.2m UT
82-01689-1  12.5    9  3 53.682- 3 37 50.87TYC 4882-01689-1
13.9    106    6.3   2.733    -1.978      6.96
   59.465  -3.633   233.40  -18.39
 20.6531  -.10080  -.43094 -9.20368  2.15946 -0.00065  0.00230
2000    201.9201162003 121.0000090.490914 212.75720114.831954 0.330762122.783410561.862763798.395   0.15
RATE 2.1224530 .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
     49  0  0   -28 25 41   20 39 34    63   -43  -27 52 36  -28 58 55
     48  0  0   -28 11 32   20 39 40    63   -43  -27 38 27  -28 44 46
     47  0  0   -27 57 20   20 39 46    63   -43  -27 24 15  -28 30 34
     46  0  0   -27 43  5   20 39 52    63   -43  -27 10  0  -28 16 20
     45  0  0   -27 28 48   20 39 58    63   -44  -26 55 43  -28  2  3
     44  0  0   -27 14 29   20 40  3    62   -44  -26 41 24  -27 47 44
     43  0  0   -27  0  8   20 40  9    62   -44  -26 27  3  -27 33 23
     42  0  0   -26 45 46   20 40 15    62   -44  -26 12 41  -27 19  0
     41  0  0   -26 31 22   20 40 21    61   -44  -25 58 18  -27  4 36
     40  0  0   -26 16 57   20 40 27    61   -44  -25 43 53  -26 50 11
     39  0  0   -26  2 32   20 40 33    60   -44  -25 29 28  -26 35 46
     38  0  0   -25 48  6   20 40 39    60   -44  -25 15  2  -26 21 19
     37  0  0   -25 33 40   20 40 45    60   -43  -25  0 36  -26  6 53
     36  0  0   -25 19 14   20 40 50    59   -43  -24 46 11  -25 52 27
     35  0  0   -25  4 48   20 40 56    58   -43  -24 31 45  -25 38  1
     34  0  0   -24 50 23   20 41  2    58   -43  -24 17 21  -25 23 35
     33  0  0   -24 35 59   20 41  8    57   -43  -24  2 57  -25  9 11
     32  0  0   -24 21 37   20 41 14    57   -43  -23 48 35  -24 54 48
     31  0  0   -24  7 16   20 41 19    56   -43  -23 34 15  -24 40 26
     30  0  0   -23 52 56   20 41 25    56   -42  -23 19 56  -24 26  6
     29  0  0   -23 38 39   20 41 31    55   -42  -23  5 39  -24 11 48
     28  0  0   -23 24 24   20 41 36    54   -42  -22 51 25  -23 57 33
     27  0  0   -23 10 12   20 41 42    54   -42  -22 37 14  -23 43 20
     26  0  0   -22 56  3   20 41 47    53   -41  -22 23  6  -23 29 11
     25  0  0   -22 41 58   20 41 53    52   -41  -22  9  1  -23 15  4
     24  0  0   -22 27 55   20 41 58    51   -41  -21 54 59  -23  1  1
     23  0  0   -22 13 57   20 42  4    51   -40  -21 41  2  -22 47  2
     22  0  0   -22  0  3   20 42  9    50   -40  -21 27  8  -22 33  7
     21  0  0   -21 46 13   20 42 14    49   -39  -21 13 20  -22 19 17
     20  0  0   -21 32 28   20 42 19    48   -39  -20 59 36  -22  5 31
     19  0  0   -21 18 48   20 42 25    48   -39  -20 45 56  -21 51 50
     18  0  0   -21  5 14   20 42 30    47   -38  -20 32 23  -21 38 14
     17  0  0   -20 51 45   20 42 35    46   -38  -20 18 55  -21 24 44
     16  0  0   -20 38 21   20 42 40    45   -37  -20  5 32  -21 11 20
     15  0  0   -20 25  4   20 42 45    44   -37  -19 52 16  -20 58  2
     14  0  0   -20 11 54   20 42 50    44   -36  -19 39  6  -20 44 50
     13  0  0   -19 58 50   20 42 54    43   -36  -19 26  3  -20 31 45
     12  0  0   -19 45 53   20 42 59    42   -35  -19 13  7  -20 18 47
     11  0  0   -19 33  3   20 43  4    41   -34  -19  0 19  -20  5 56
     10  0  0   -19 20 20   20 43  8    40   -34  -18 47 37  -19 53 13
      9  0  0   -19  7 46   20 43 13    39   -33  -18 35  4  -19 40 37
      8  0  0   -18 55 19   20 43 17    38   -33  -18 22 38  -19 28 10
      7  0  0   -18 43  1   20 43 22    38   -32  -18 10 21  -19 15 50
      6  0  0   -18 30 51   20 43 26    37   -31  -17 58 13  -19  3 39
      5  0  0   -18 18 50   20 43 30    36   -31  -17 46 13  -18 51 37
   ........................... 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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