Update for (980) Anacostia - September 10/11, 2003

Jan Manek's update

                 IOTA/IOTA-ES occultation update for
        (980) Anacostia / TYC 2829-01363-1 on September 10/11, 2003
                visible from Africa, S Spain and S Portugal

Summary 

In the night of September 10/11, 2003 a faint 10.1 mag star TYC 2829-01363-1 will be occulted by a 89 km asteroid (980) Anacostia. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

The updated path shows ~1 path width south shift with time ~0.5 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs due to south shift over Africa, S Spain ~22:07.5 UT and S Portugal ~22:07.8 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: September 10, 2003 @ 22:07 UT (Europe)
 * magnitude of target star: 10.1
 * magnitude drop [mag]: 1.8
 * estimated maximum duration [s]: 14.7
 * path description: given above
 * Goffin's original chart reference: A03_0965

The occultation path:
 * approximate ground width [km]: 145
 * uncertainty [path widths]: 0.8
 * uncertainty in time [s]: 12
 * 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 2829-01363-1
 * constellation: Andromeda
 * J2000 position [h,m,s; o,',"]: 02h 07m 10.7147s; +37o 54' 51.458"
 * position source: UCAC2
 * estimated accuracy ["]: 0.02" (0.01", 0.01")
 * V mag [mag]: 10.05
 * B-V [mag]: +0.59
 * remarks:
    Target star is in east Andromeda, about 4.5 degrees south of double star 2.1 mag star gamma Andromedae = SAO 37734 or
    16' west of 4.8 mag star 58 And = SAO 55289.
    !!! 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: (980) Anacostia
     approx. diameter [km]: 89
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 94 USNO
     number of rejected observations: 21 USNO
     time covered by the observations: 1998 06 11 - 2003 08 31
     rms residuals ["] (RA,DE): 0.06", 0.08"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 22:01.1 UT
 * approx. V mag of minor planet at event [mag]: 11.7
 * geocentric parallax of minor planet ["]: 5.778
 * magnitude drop [mag]: 1.8
 * estimated maximum duration [s]: 14.7
 * apparent motion of minor planet ["/h]: 18.78
 * angular distance to moon, phase of moon [deg,%]: 58, 100%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Sep 10
  980  Anacostia
22h  1.1m UT
  10.1    2  7 10.715 37 54 51.46TYC 2829-01363-1      10.6
11.7     89   14.7   1.522    -0.005     19.77
 -287.998  37.909  -151.02    4.83
 22.0178  -.78254  -.00220 -0.00664  3.42348 -0.00365 -0.00275
2000    15.38564272003 9 8.0000069.602694 286.07275315.886598 0.202081442.740897402.187012917.855   0.06
RATE 2.1720254 .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  '  "
      6  0  0    30 32 55   22  4 12    37    63   -49   31 22  4   29 42 39   32 35 44   28 22 48
      5  0  0    31 14 35   22  4 31    36    63   -48   32  2 35   30 25 33   33 14 37   29  7 46
      4  0  0    31 53 34   22  4 48    36    64   -47   32 40 31   31  5 37   33 51  4   29 49 42
      3  0  0    32 30  1   22  5  6    35    64   -46   33 16  2   31 43  5   34 25 13   30 28 50
      2  0  0    33  4  7   22  5 22    35    64   -45   33 49 16   32 18  5   34 57 14   31  5 21
      1  0  0    33 36  0   22  5 38    34    64   -44   34 20 22   32 50 47   35 27 13   31 39 25
      0  0  0    34  5 47   22  5 53    34    64   -43   34 49 27   33 21 20   35 55 16   32 11 12
   -  1  0  0    34 33 36   22  6  8    33    64   -42   35 16 37   33 49 50   36 21 29   32 40 49
   -  2  0  0    34 59 32   22  6 22    33    64   -41   35 41 58   34 16 23   36 45 58   33  8 24
   -  3  0  0    35 23 40   22  6 36    32    64   -41   36  5 33   34 41  5   37  8 47   33 34  2
   -  4  0  0    35 46  5   22  6 49    32    64   -40   36 27 29   35  4  1   37 30  0   33 57 49
   -  5  0  0    36  6 52   22  7  2    31    63   -39   36 47 49   35 25 16   37 49 41   34 19 49
   -  6  0  0    36 26  3   22  7 15    31    63   -38   37  6 36   35 44 52   38  7 52   34 40  8
   -  7  0  0    36 43 43   22  7 27    30    63   -38   37 23 54   36  2 55   38 24 38   34 58 48
   -  8  0  0    36 59 54   22  7 39    30    63   -37   37 39 45   36 19 27   38 40  0   35 15 53
   -  9  0  0    37 14 39   22  7 51    29    63   -36   37 54 12   36 34 30   38 54  1   35 31 26
   - 10  0  0    37 28  0   22  8  2    29    62   -35   38  7 18   36 48  8   39  6 44   35 45 30
   - 11  0  0    37 39 59   22  8 13    28    62   -35   38 19  3   37  0 21   39 18  9   35 58  8
   - 12  0  0    37 50 39   22  8 23    27    62   -34   38 29 31   37 11 13   39 28 19   36  9 20
   - 13  0  0    38  0  0   22  8 34    27    61   -33   38 38 42   37 20 45   39 37 16   36 19  9
   - 14  0  0    38  8  5   22  8 44    26    61   -33   38 46 38   37 28 58   39 44 59   36 27 36
   - 15  0  0    38 14 53   22  8 54    26    61   -32   38 53 19   37 35 54   39 51 30   36 34 43
   - 16  0  0    38 20 26   22  9  3    25    60   -31   38 58 47   37 41 32   39 56 51   36 40 30
   - 17  0  0    38 24 45   22  9 13    24    60   -31   39  3  3   37 45 55   40  1  1   36 44 58
   - 18  0  0    38 27 50   22  9 22    24    59   -30   39  6  6   37 49  2   40  4  1   36 48  8
   - 19  0  0    38 29 42   22  9 31    23    59   -29   39  7 57   37 50 54   40  5 52   36 50  0
   - 20  0  0    38 30 20   22  9 39    22    59   -29   39  8 36   37 51 30   40  6 33   36 50 34
   - 21  0  0    38 29 44   22  9 48    22    58   -28   39  8  4   37 50 51   40  6  4   36 49 50
   - 22  0  0    38 27 55   22  9 56    21    58   -28   39  6 19   37 48 57   40  4 26   36 47 48
   - 23  0  0    38 24 51   22 10  4    20    57   -27   39  3 21   37 45 46   40  1 37   36 44 27
    ...................................... 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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