Update for (480) Hansa - February 4/5, 2003 - South Africa

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (480) Hansa / TYC 5421-01271-1 on February 4/5, 2003
                 visible from S South Africa and Brasil

Summary 

In the night of February 4/5, 2003 a faint 10.2 mag star TYC 5421-01271-1 will be occulted by a 58 km asteroid (480) Hansa. This update is based on USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.

The updated path shows ~1 path width south shift with time 0.6 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over S South Africa around 22:39.2 UT with East London in path ~22:38.5 UT and Brasil 22:48.0-22:50 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 4, 2003 @ 22:39 UT (S.Africa)
 * magnitude of target star: 10.2
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 5.2
 * path description: given above
 * Goffin's original chart reference: A03_0237

The occultation path:
 * approximate ground width [km]: 60
 * uncertainty [path widths]: 1.5
 * 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 5421-01271-1
 * constellation: Puppis
 * J2000 position [h,m,s; o,',"]: 08h 05m 16.3439s; -12o 45' 19.815"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.04" (0.01", 0.04")
 * V mag [mag]: 10.19
 * B-V [mag]: +1.97
 * remarks:
    Target star is in north Puppis, about 6.7 degrees southeast of 3.9 mag star alpha Monocerotis = SAO 134986.
    !!! 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:





Data for the minor planet:
 * general information:
     number, name: (480) Hansa
     approx. diameter [km]: 58
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 113 USNO
     number of rejected observations: 18 USNO
     time covered by the observations: 1998 11 27 - 2003 01 20
     rms residuals ["] (RA,DE): 0.06", 0.08"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 22:42.0 UT
 * approx. V mag of minor planet at event [mag]: 12.3
 * geocentric parallax of minor planet ["]: 5.279
 * magnitude drop [mag]: 2.2
 * estimated maximum duration [s]: 5.2
 * apparent motion of minor planet ["/h]: 32.97
 * angular distance to moon, phase of moon [deg,%]: 120, 12%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Feb 04
480 Hansa
22h 42.0m UT
21-01271-1  10.2    8  5 16.344-12 45 19.82TYC 5421-01271-1
12.3     58    5.2   1.666    -2.192      7.63
    6.132 -12.758   202.99  -16.13
 22.7003  -.06323  -.26588 -6.07935  1.44239  0.00165  0.00278
2000    35.92264312003 131.00000213.673910237.44982421.287770 0.046895802.645079822.521036678.385   0.15
RATE 2.2911098 .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
     33  0  0   -33 22 21   22 37 48    59   -40  -33  5 55  -33 38 48
     32  0  0   -33 16 22   22 37 56    59   -40  -32 59 56  -33 32 50
     31  0  0   -33 10  8   22 38  3    60   -40  -32 53 40  -33 26 36
     30  0  0   -33  3 37   22 38 11    61   -41  -32 47  9  -33 20  6
     29  0  0   -32 56 51   22 38 18    62   -41  -32 40 23  -33 13 21
     28  0  0   -32 49 50   22 38 26    62   -41  -32 33 21  -33  6 20
     27  0  0   -32 42 33   22 38 33    63   -41  -32 26  3  -32 59  4
     26  0  0   -32 34 60   22 38 41    64   -41  -32 18 29  -32 51 32
     25  0  0   -32 27 11   22 38 49    64   -42  -32 10 40  -32 43 44
     24  0  0   -32 19  8   22 38 57    65   -42  -32  2 36  -32 35 41
     23  0  0   -32 10 49   22 39  5    66   -42  -31 54 16  -32 27 23
     22  0  0   -32  2 14   22 39 13    66   -42  -31 45 41  -32 18 49
     21  0  0   -31 53 24   22 39 21    67   -42  -31 36 50  -32 10  0
     20  0  0   -31 44 19   22 39 29    67   -42  -31 27 44  -32  0 56
     19  0  0   -31 34 59   22 39 37    68   -42  -31 18 23  -31 51 36
     18  0  0   -31 25 24   22 39 45    69   -42  -31  8 47  -31 42  2
     17  0  0   -31 15 33   22 39 53    69   -42  -30 58 56  -31 32 12
     16  0  0   -31  5 28   22 40  1    70   -42  -30 48 50  -31 22  8
     15  0  0   -30 55  8   22 40 10    70   -42  -30 38 28  -31 11 49
     14  0  0   -30 44 33   22 40 18    71   -42  -30 27 52  -31  1 14
   ........................... 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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