Update for (779) Nina - August 18/19, 2003

Jan Manek's update

                 IOTA/IOTA-ES occultation update for
         (779) Nina / TYC 0513-00206-1 on August 18/19, 2003
        visible from S Russia, N Ukraine, SW Belarus, N Poland,
                       N Germany and Scotland

Summary 

In the night of August 18/19, 2003 a faint 12.2 mag star TYC 0513-00206-1 will be occulted by a 73 km asteroid (779) Nina. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2-beta star position.

The updated path shows ~6 path width north shift with time ~0.4 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs due to north shift over S Russia ~20:21 UT, N Ukraine ~20:22.5 UT with Kharkov and Kiev in path, SW Belarus ~20:23.7 UT, N Poland ~20:24.2 UT with Warsaw in path, N Germany ~20:25.3 UT and Scotland ~20:26.8 UT with Glasgow in path. Please check the path chart for details.
Please remember that magnitude drop is only 0.24 mag so this is not observable visually !!!

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: August 18, 2003 @ 20:24 UT
 * magnitude of target star: 12.2
 * magnitude drop [mag]: 0.2
 * estimated maximum duration [s]: 9.4
 * path description: given above
 * Goffin's original chart reference: A03_0839

The occultation path:
 * approximate ground width [km]: 110
 * uncertainty [path widths]: 0.60
 * uncertainty in time [s]: 6
 * 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 0513-00206-1
 * constellation: Aquarius
 * J2000 position [h,m,s; o,',"]: 20h 55m 03.8431s; +00o 23' 04.118"
 * position source: recent UCAC2 beta
 * estimated accuracy ["]: 0.03" (0.02", 0.02")
 * V mag [mag]: 12.19
 * B-V [mag]: +0.60
 * remarks:
    Target star is in north-west Aquarius, rather far from bright stars.
    !!! 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 GUIDE8):
 * 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: Second chart shows 30' blowup to show correctly the star in field.










Data for the minor planet:
 * general information:
     number, name: (779) Nina
     approx. diameter [km]: 73
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 108 USNO
     number of rejected observations: 17
     time covered by the observations: 1998 03 03 - 2003 07 26
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 20:19.1 UT
 * approx. V mag of minor planet at event [mag]: 10.7
 * geocentric parallax of minor planet ["]: 8.075
 * magnitude drop [mag]: 0.2
 * estimated maximum duration [s]: 9.4
 * apparent motion of minor planet ["/h]: 35.28
 * angular distance to moon, phase of moon [deg,%]: 87, 61%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Aug 18
779 Nina
20h 19.1m UT
13-00206-1  12.2   20 55  3.843  0 23  4.12TYC 0513-00206-1
10.7     73    9.4   1.089    -2.299      7.34
   42.215   0.384  -123.80   13.03
 20.3178   .15075   .70935 -4.27364  0.91049  0.00119 -0.00121
2000    350.9050512003 8 9.0000048.944294 283.90724414.571654 0.225361832.665440262.064751778.305   0.15
RATE 2.2649090 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek








Path coordinates:
                  Centre              Star  Star   Sun      Path Limits           Error Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4
                                                         Latitude   Latitude   Latitude   Latitude
    ...................................... shortened .............................................
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
     54  0  0    46  1  7   20 19 12    43   196   -31   46 31 19   45 31 13   47  7 20   44 56 18
     52  0  0    46 26 17   20 19 32    43   194   -31   46 56 30   45 56 21   47 32 33   45 21 24
     50  0  0    46 51 23   20 19 51    43   191   -30   47 21 38   46 21 26   47 57 42   45 46 28
     48  0  0    47 16 24   20 20 11    43   188   -29   47 46 40   46 46 26   48 22 45   46 11 27
     46  0  0    47 41 18   20 20 30    43   186   -29   48 11 34   47 11 20   48 47 41   46 36 19
     44  0  0    48  6  3   20 20 50    42   183   -28   48 36 20   47 36  4   49 12 28   47  1  3
     42  0  0    48 30 37   20 21  9    42   180   -27   49  0 55   48  0 38   49 37  3   47 25 36
     40  0  0    48 54 59   20 21 27    42   178   -27   49 25 17   48 24 59   50  1 25   47 49 57
     38  0  0    49 19  7   20 21 46    41   175   -26   49 49 24   48 49  7   50 25 33   48 14  5
     36  0  0    49 42 59   20 22  4    41   173   -25   50 13 16   49 12 59   50 49 24   48 37 57
     34  0  0    50  6 33   20 22 21    40   170   -24   50 36 50   49 36 34   51 12 58   49  1 32
     32  0  0    50 29 49   20 22 38    39   168   -23   51  0  5   49 59 50   51 36 12   49 24 49
     30  0  0    50 52 44   20 22 55    39   165   -23   51 22 59   50 22 46   51 59  5   49 47 46
     28  0  0    51 15 17   20 23 12    38   163   -22   51 45 31   50 45 20   52 21 36   50 10 21
     26  0  0    51 37 27   20 23 28    37   161   -21   52  7 40   51  7 31   52 43 43   50 32 34
     24  0  0    51 59 13   20 23 44    37   158   -20   52 29 25   51 29 18   53  5 26   50 54 22
     22  0  0    52 20 33   20 23 59    36   156   -19   52 50 43   51 50 40   53 26 43   51 15 46
     20  0  0    52 41 26   20 24 14    35   154   -18   53 11 35   52 11 35   53 47 32   51 36 43
     18  0  0    53  1 52   20 24 29    34   152   -17   53 31 58   52 32  2   54  7 53   51 57 12
     16  0  0    53 21 48   20 24 43    33   150   -16   53 51 53   52 52  1   54 27 45   52 17 13
     14  0  0    53 41 15   20 24 56    32   148   -15   54 11 17   53 11 30   54 47  7   52 36 45
     12  0  0    54  0 11   20 25 10    31   146   -14   54 30 11   53 30 28   55  5 58   52 55 46
     10  0  0    54 18 36   20 25 22    31   144   -13   54 48 33   53 48 56   55 24 17   53 14 16
      8  0  0    54 36 28   20 25 35    30   142   -12   55  6 23   54  6 50   55 42  3   53 32 13
      6  0  0    54 53 48   20 25 47    29   140   -11   55 23 40   54 24 12   55 59 17   53 49 38
      4  0  0    55 10 33   20 25 58    28   138   -10   55 40 22   54 41  1   56 15 56   54  6 30
      2  0  0    55 26 45   20 26  9    27   136    -9   55 56 31   54 57 15   56 32  1   54 22 47
      0  0  0    55 42 21   20 26 20    26   134    -8   56 12  5   55 12 55   56 47 31   54 38 30
   -  2  0  0    55 57 23   20 26 30    25   132    -7   56 27  3   55 27 59   57  2 26   54 53 38
   -  4  0  0    56 11 49   20 26 40    24   130    -6   56 41 26   55 42 28   57 16 45   55  8 10
   -  6  0  0    56 25 38   20 26 49    23   128    -5   56 55 13   55 56 20   57 30 28   55 22  6
   -  8  0  0    56 38 51   20 26 58    22   126    -4   57  8 23   56  9 36   57 43 35   55 35 25
    ...................................... 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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