Update for (102) Miriam - January 11/12, 2000

Martin Federspiel's update

                     IOTA/IOTA-ES occultation update for
               (102) Miriam/HIP 39740 event on 2000 January 11/12
                     visible from central Europe, Labrador


Summary 

On the early morning (UT) of 2000 Jan 12 the 90 km large asteroid (102) Miriam will occult the 9.6 mag star SAO 97571. This is a rather favourable event for central Europe where the remaining uncertainty of the path is about 1 path width.

The updated path shifted by about 0.4" northward compared to the nominal prediction of E. Goffin. Goffin's nominal prediction file has number a00_0113.ps.gz.

This update is based on USNO and TMO astrometry for the asteroid and on the Hipparcos position of the star.

The event at one glimpse:
 * date and approx. UT time of event: 2000 Jan 12, 2h UT
 * magnitude of target star: 9.6
 * magnitude drop [mag]: 3.7
 * estimated maximum duration [s]: 6.3
 * rough path description: Austria, southern Germany, northern France,
   southwestern England, southern Ireland; path similar to European part
   of solar eclipse path of 1999 Aug 11

The occultation path:
 * approximate widths [km]: 100
 * more detailed path description: northeastern Turkey, Black Sea, northern
   Bulgaria, southern Romania, southern Hungary, Austria, southern Germany,
   northern France, perhaps touching Luxembourg and southern Belgium,
   southwestern England (Cornwall), southern Ireland
 * uncertainty [path widths]: 1.1
 * map: attached
 * remarks: path similar to European part of solar eclipse path of 1999 Aug 11;
   updated path shifted by 0.4" northwards compared to Edwin Goffin's nominal
   prediction; times 0.7 minutes earlier than Goffin's prediction

Data for the target star:
 * name: HIP 39740 = SAO 97571
 * constellation: Cancer (near beta Cnc)
 * J2000 position [h,m,s; °,',"]: RA  8h  7m 19.553s DE +12° 12' 34.47"
 * position source: HIP
 * estimated accuracy ["]: 0.01
 * V mag [mag]: 9.59
 * remarks:





Data for the minor planet:
 * general information:
     mumber, name: (102) Miriam
     approx. diameter [km]: 86
 * orbital information
     orbit source: calculation Federspiel
     source of used astrometry: USNO, TMO
     number of used observations: 42 USNO, 5 averaged TMO
     number of rejected observations: 0
     time covered by the observations: 1998 Jun 16 - 2000 Jan 04
     rms residuals ["] (RA,DE): 0.07
     estimated positional accuracy at epoch of event ["]: 0.07
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 2000 Jan 12 @ 2h 04m 11s
 * least geocentric distance ["]: 3.06
 * uncertainty in time [s]: 7
 * approx. V mag of minor planet at event [mag]: 13.3
 * geocentric parallax of minor planet ["]: 4.67
 * magnitude drop [mag]: 3.7
 * estimated maximum duration [s]: 6.3
 * apparent motion of minor planet ["/h]: 35.90"/h
 * angular distance to moon, phase of moon [°,%]: 129°, 25%+
 * remarks:

Calculator(s): Martin Federspiel





Path coordinates:

     Lat.     Long. hh:mm:ss UT  StarAlt° StarAzi°  SunAlt°  SunAzi°
     31.04    73.55  1:58:19. !      4.6    281.6     -2.2    114.2
     33.69    63.01  1:58:35. !     13.6    275.8    -11.4    108.7
     35.33    56.94  1:58:50. !     18.7    272.0    -16.6    105.3
     36.69    52.08  1:59: 6. !     22.5    268.7    -20.7    102.3
     37.90    47.83  1:59:21. !     25.8    265.5    -24.1     99.6
     39.00    43.98  1:59:37. !     28.6    262.4    -27.2     96.9
     40.03    40.40  1:59:53. !     31.1    259.4    -30.0     94.2
     40.99    37.01  2: 0: 8. !     33.4    256.3    -32.6     91.6
     41.91    33.76  2: 0:24. !     35.5    253.1    -35.0     88.8
     42.79    30.62  2: 0:40. !     37.3    249.9    -37.2     86.1
     43.63    27.56  2: 0:55. !     39.1    246.6    -39.3     83.2
     44.44    24.57  2: 1:11. !     40.6    243.2    -41.3     80.2
     45.23    21.62  2: 1:26. !     42.0    239.7    -43.1     77.1
     45.98    18.70  2: 1:42. !     43.3    236.1    -44.9     73.9
     46.72    15.81  2: 1:58. !     44.5    232.4    -46.5     70.5
     47.43    12.93  2: 2:13. !     45.5    228.6    -48.1     67.0
     48.11    10.05  2: 2:29. !     46.4    224.6    -49.5     63.3
     48.78     7.17  2: 2:45. !     47.2    220.6    -50.8     59.4
     49.42     4.28  2: 3: 0. !     47.8    216.4    -52.0     55.3
     50.05     1.37  2: 3:16. !     48.4    212.2    -53.1     51.1
     50.65    -1.57  2: 3:31. !     48.7    207.8    -54.1     46.6
     51.23    -4.53  2: 3:47. !     49.0    203.4    -55.0     42.0
     51.79    -7.54  2: 4: 3. !     49.2    198.9    -55.7     37.1
     52.33   -10.58  2: 4:18. !     49.2    194.4    -56.3     32.1
     52.85   -13.68  2: 4:34. !     49.0    189.7    -56.7     26.8
     53.34   -16.83  2: 4:49. !     48.8    185.1    -57.0     21.5
     53.80   -20.05  2: 5: 5. !     48.4    180.4    -57.2     16.0
     54.24   -23.33  2: 5:21. !     47.9    175.7    -57.2     10.4
     54.66   -26.68  2: 5:36. !     47.3    171.0    -57.1      4.7
     55.04   -30.12  2: 5:52. !     46.5    166.3    -56.7    358.9
     55.39   -33.65  2: 6: 8. !     45.6    161.6    -56.2    353.1
     55.70   -37.28  2: 6:23. !     44.6    156.9    -55.6    347.3
     55.98   -41.01  2: 6:39. !     43.5    152.2    -54.8    341.5
     56.22   -44.86  2: 6:54. !     42.2    147.4    -53.8    335.8
     56.42   -48.84  2: 7:10. !     40.8    142.7    -52.6    330.1
     56.56   -52.97  2: 7:26. !     39.3    137.9    -51.3    324.4
     56.65   -57.25  2: 7:41. !     37.6    133.1    -49.8    318.7
     56.68   -61.72  2: 7:57. !     35.8    128.3    -48.1    313.1
     56.63   -66.40  2: 8:13. !     33.7    123.4    -46.1    307.4
     56.51   -71.34  2: 8:28. !     31.5    118.4    -44.0    301.7
     56.29   -76.57  2: 8:44. !     29.0    113.2    -41.6    295.9
     55.94   -82.20  2: 8:59. !     26.2    107.9    -38.9    290.0
     55.44   -88.36  2: 9:15. !     23.1    102.2    -35.8    283.9
     54.71   -95.32  2: 9:31. !     19.3     96.0    -32.0    277.2
     53.61  -103.70  2: 9:46. !     14.5     88.9    -27.2    269.7
     51.48  -116.32  2:10: 2. !      6.7     78.7    -19.4    259.1

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Martin Federspiel                 ******** E-mail: martin@astro.unibas.ch
Astronomisches Institut           ******** oder: federspi@astro.unibas.ch
der Universitaet Basel            **** oder: federspielm@ubaclu.unibas.ch
Venusstr. 7                             Telefon: (CH)-61/2055413
CH-4102 Binningen (Schweiz)             Fax:     (CH)-61/2055455
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