Update for (270) Anahita - December 15/16, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
          (270) Anahita / TYC 0259-01420-1 on December 15/16, 2002
visible from Greenland, Iceland, Netherlands, Germany, Austria and frm.Yugoslavia

Summary 

In the morning of December 15/16, 2002 a faint 11.4 mag star TYC 0259-01420-1 will be occulted by a 52 km asteroid (270) Anahita. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~2 path width south shift with time 0.3 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Greenland, NE Iceland ~5:46 UT, Netherlands ~5:49.8 UT, Germany with Munich around 5:50.5 UT, Austria ~5:51.5 UT and frm.Yugoslavia ~5:52 UT with twilight. Uncertainties are rather large due to poor Tycho-2 star position and also as there is no recent opposition astrometry for asteroid. So observers also in U.K., Belgium, NE France, Switzerland, Czechia and Italy still have chance. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: December 16, 2002 @ 05:50 UT (Europe)
 * magnitude of target star: 11.4
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 7.0
 * path description: given above
 * Goffin's original chart reference: A02_1229

The occultation path:
 * approximate ground width [km]: 75
 * uncertainty [path widths]: 3.9
 * uncertainty in time [s]: 25
 * 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 0259-01420-1
 * constellation: Sextant
 * J2000 position [h,m,s; o,',"]: 10h 35m 06.5991s; +06o 11' 17.538"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.12" (0.8", 0.9")
 * V mag [mag]: 11.39
 * B-V [mag]: +0.49
 * remarks:
    Target star is in NE Sextant, about 3.2 degrees south of 3.9 mag star rho Leonis = SAO 118355.
    !!! 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 2.0x2.0 degrees
 * limiting magnitude is 13.0
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (270) Anahita
     approx. diameter [km]: 52
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 88 USNO, 53 TMO
     number of rejected observations: 10 USNO, 1 TMO
     time covered by the observations: 1997 06 20 - 2001 12 18
     rms residuals ["] (RA,DE): 0.07", 0.05"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 05:52.9 UT
 * approx. V mag of minor planet at event [mag]: 13.4
 * geocentric parallax of minor planet ["]: 4.292
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 7.0
 * apparent motion of minor planet ["/h]: 17.92
 * angular distance to moon, phase of moon [deg,%]: 114, 88%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2002 Dec 16
270 Anahita
 5h 52.9m UT
59-01420-1  11.4   10 35  6.599  6 11 17.54TYC 0259-01420-1
13.4     52    7.0   2.049     1.016     -9.53
  -14.151   6.192    90.65  -23.31
  5.8813   .38456   .61050  3.53295 -2.22292 -0.00516  0.00214
2000    153.46440320021212.0000080.253343 254.6382332.365230  0.150013922.199312351.869384878.755   0.15
RATE 3.0218560 .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
   - 21  0  0    69  2 39    5 45 25    27   -30   68 32 24   69 33 19
   - 20  0  0    68 37 49    5 45 31    27   -30   68  7 20   69  8 43
   - 19  0  0    68 12  9    5 45 37    28   -29   67 41 26   68 43 18
   - 18  0  0    67 45 40    5 45 43    28   -29   67 14 43   68 17  3
   - 17  0  0    67 18 19    5 45 49    29   -29   66 47  9   67 49 56
   - 16  0  0    66 50  6    5 45 55    29   -28   66 18 43   67 21 56
   - 15  0  0    66 20 60    5 46  2    30   -28   65 49 25   66 53  2
   - 14  0  0    65 50 60    5 46  9    30   -28   65 19 13   66 23 15
   - 13  0  0    65 20  6    5 46 17    31   -27   64 48  8   65 52 32
   - 12  0  0    64 48 16    5 46 25    31   -27   64 16  9   65 20 54
   - 11  0  0    64 15 32    5 46 33    32   -27   63 43 14   64 48 19
   - 10  0  0    63 41 52    5 46 41    33   -26   63  9 25   64 14 49
   -  9  0  0    63  7 16    5 46 50    33   -26   62 34 41   63 40 21
   -  8  0  0    62 31 44    5 46 59    34   -25   61 59  2   63  4 57
   -  7  0  0    61 55 17    5 47  8    34   -25   61 22 28   62 28 37
   -  6  0  0    61 17 55    5 47 18    35   -24   60 45  0   61 51 20
   -  5  0  0    60 39 38    5 47 28    35   -23   60  6 39   61 13  8
   -  4  0  0    60  0 27    5 47 39    36   -23   59 27 24   60 34  1
   -  3  0  0    59 20 23    5 47 50    36   -22   58 47 18   59 54  0
   -  2  0  0    58 39 28    5 48  1    37   -22   58  6 21   59 13  6
   -  1  0  0    57 57 42    5 48 13    37   -21   57 24 34   58 31 21
      0  0  0    57 15  7    5 48 25    38   -20   56 41 60   57 48 46
      1  0  0    56 31 45    5 48 38    38   -20   55 58 39   57  5 23
      2  0  0    55 47 38    5 48 50    39   -19   55 14 35   56 21 13
      3  0  0    55  2 48    5 49  4    39   -18   54 29 49   55 36 20
      4  0  0    54 17 18    5 49 17    40   -17   53 44 23   54 50 44
      5  0  0    53 31  9    5 49 31    40   -16   52 58 19   54  4 30
      6  0  0    52 44 25    5 49 46    41   -16   52 11 42   53 17 39
      7  0  0    51 57  9    5 50  0    41   -15   51 24 33   52 30 15
      8  0  0    51  9 23    5 50 15    42   -14   50 36 55   51 42 21
      9  0  0    50 21 10    5 50 30    42   -13   49 48 52   50 53 59
     10  0  0    49 32 35    5 50 46    42   -12   49  0 26   50  5 13
     11  0  0    48 43 39    5 51  2    43   -11   48 11 41   49 16  6
     12  0  0    47 54 27    5 51 18    43   -10   47 22 40   48 26 42
     13  0  0    47  5  1    5 51 34    43    -9   46 33 26   47 37  4
     14  0  0    46 15 26    5 51 51    43    -8   45 44  4   46 47 16
     15  0  0    45 25 45    5 52  7    43    -7   44 54 35   45 57 20
     16  0  0    44 36  0    5 52 24    44    -6   44  5  5   45  7 22
     17  0  0    43 46 17    5 52 41    44    -5   43 15 35   44 17 24
   ........................... 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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