Update for (219) Thusnelda - August 21, 1999

  • Update computed by Jan Manek;   issued 17 Aug 1999 11:41:36 +0200 (CEST)
  • Final update computed by Martin Federspiel;   issued 17 Aug 1999 09:59:53 +0200 (CEST)
  • Update computed by Martin Federspiel;   issued 24 Jul 1999 11:47:41 +0200 (CEST)
  • Agreement between Martin's and Jan's updates are good, Martin's is very slightly south of Jan's and few seconds later.


    Martin Federspiel's update

                         IOTA/IOTA-ES occultation update for
                  (219) Thusnelda/TYC 0537 00145 event on 1999 Aug 21
     visible from southeastern Europe, northwestern Africa, parts of South America
    
    
    Summary 

    The 40 km large asteroid (219) Thusnelda will occult a 9.5 mag star in the Pegasus/Equuleus region on the very early morning of 1999 Aug 21 (UT). The event will be visible for observers in southeastern Europe (Italy; near Napoli), northwestern Africa and parts of South America.

    CAMC and USNO observations were available for the update of the asteroid's orbit. Using either the USNO positions alone or combining them with the CAMC observations yields slightly different results. The USNO positions show a small residual of 0.1" in declination with respect to the combined CAMC+USNO solution, which is probably due to small differences between the reference systems used (although CAMC *should* also be ICRF).

    The path difference for the two solutions is 0.11" and 23 s; I consider the USNO solution to be the more accurate one. The UNSO solution is 10 s later and about 0.4" northwest of Goffin's nominal prediction which was based on a rather old orbit for the asteroid. The combined CAMC+USNO solution is 0.11" southeast of the USNO solution.

    
    The event at one glimpse:
     * date and approx. UT time of event: 1999 Aug 21 @ 01h 04m - 01h 39m UT
     * magnitude of target star: 9.45
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7s
     * rough path description: Ukrainia, Romania, former Yogoslawia, Italy,
       southern Sardinia, Algeria, border Algeria/Morocco, Western Sahara,
       Brazil, Bolivia, northern Chile
    
    The occultation path:
     * approximate widths [km]: 45
     * more detailed path description: see map and table
     * uncertainty [path widths]: 1.5
     * map: attached
     * remarks: solution from USNO positions only is 0.11" northwest of solution
       based on CAMC and USNO positions
    
    Data for the target star:
     * name: TYC 0537 00145
     * constellation: border Pegasus/Equuleus
     * J2000 position [h,m,s; °,',"]: RA 21 28 53.218 DE +5 25 44.69
     * position source: ACT
     * estimated accuracy ["]: 0.03
     * V mag [mag]: 9.45
     * remarks: quality flag 3 in Tycho catalogue (good quality)
    
    Data for the minor planet:
     * general information:
         mumber, name: (219) Thusnelda
         approx. diameter [km]: 40
     * orbital information
         orbit source: Federspiel
         source of used astrometry: USNO; USNO/CAMC
         number of used observations: 25/91
         number of rejected observations: 0
         time covered by the observations: 1998-1999/1993-1999
         rms residuals ["] (RA,DE): (0.06",0.08")/(0.21",0.18")
         estimated positional accuracy at epoch of event ["]: 0.10"
         remarks: systematic positive residuals of about 0.1" in DE remain for
         USNO observations for the CAMC/USNO orbital solution; problem of
         common reference system?
    
    Data for the event:
     * UT date and time of least geocentric approach: 1999 Aug 21 @ 1h 21m 39s UT (USNO)
                                                                    1h 21m 16s (CAMC+USNO)
     * least geocentric distance ["]: 0.95" (USNO); 0.84" (CAMC+USNO)
     * uncertainty in time [s]: 15
     * approx. V mag of minor planet at event [mag]: 11.0
     * geocentric parallax of minor planet ["]: 10.29
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7
     * apparent motion of minor planet ["/h]: 34.76
     * angular distance to moon, phase of moon [°,%]: 67°, 68%+
     * remarks:
    
    Calculator(s): Martin Federspiel
    
    

    Updated path location for (219) Thusnelda on August 21, 1999

    Updated path location for (219) Thusnelda on August 21, 1999 Path coordinates: USNO solution (favourite solution): Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi° 51.00 58.89 1: 4:14. ! 9.6 266.9 -.1 70.0 50.04 46.03 1: 4:49. ! 17.7 257.1 -7.9 60.0 48.71 37.72 1: 5:25. ! 23.1 250.8 -13.0 53.4 47.25 31.28 1: 6: 0. ! 27.6 246.0 -17.2 48.4 45.74 25.96 1: 6:36. ! 31.4 242.1 -20.8 44.1 44.22 21.38 1: 7:12. ! 34.9 238.9 -24.1 40.5 42.68 17.36 1: 7:47. ! 38.1 236.1 -27.0 37.2 41.15 13.76 1: 8:23. ! 41.1 233.6 -29.8 34.3 39.63 10.50 1: 8:58. ! 43.9 231.3 -32.3 31.5 38.12 7.51 1: 9:34. ! 46.5 229.3 -34.8 29.0 36.62 4.74 1:10: 9. ! 49.1 227.4 -37.1 26.6 35.13 2.15 1:10:45. ! 51.5 225.6 -39.3 24.3 33.65 -.27 1:11:20. ! 53.9 224.0 -41.4 22.0 32.18 -2.56 1:11:56. ! 56.2 222.4 -43.4 19.8 30.73 -4.74 1:12:31. ! 58.4 220.8 -45.3 17.6 29.28 -6.81 1:13: 7. ! 60.6 219.2 -47.2 15.4 27.84 -8.80 1:13:42. ! 62.8 217.7 -48.9 13.1 26.42 -10.71 1:14:18. ! 64.8 216.0 -50.7 10.9 25.00 -12.56 1:14:53. ! 66.9 214.3 -52.3 8.5 23.59 -14.35 1:15:29. ! 68.9 212.5 -53.9 6.1 22.19 -16.08 1:16: 4. ! 70.8 210.5 -55.4 3.6 20.79 -17.77 1:16:40. ! 72.7 208.2 -56.9 1.0 19.40 -19.43 1:17:15. ! 74.6 205.5 -58.3 358.2 18.02 -21.04 1:17:51. ! 76.5 202.3 -59.6 355.3 16.63 -22.63 1:18:26. ! 78.2 198.3 -60.8 352.2 15.25 -24.20 1:19: 2. ! 79.9 193.0 -61.9 349.0 13.88 -25.74 1:19:38. ! 81.5 185.9 -63.0 345.5 12.50 -27.27 1:20:13. ! 82.9 175.9 -63.9 341.9 11.13 -28.78 1:20:49. ! 84.0 161.9 -64.8 338.0 9.76 -30.28 1:21:24. ! 84.6 143.4 -65.5 333.9 8.38 -31.77 1:21:60. ! 84.6 122.8 -66.1 329.7 7.01 -33.26 1:22:35. ! 83.9 104.7 -66.5 325.2 5.63 -34.75 1:23:11. ! 82.8 91.2 -66.8 320.7 4.25 -36.24 1:23:46. ! 81.4 81.8 -66.9 316.1 2.87 -37.73 1:24:22. ! 79.8 75.2 -66.9 311.5 1.48 -39.23 1:24:57. ! 78.1 70.4 -66.8 306.9 .08 -40.75 1:25:33. ! 76.3 66.9 -66.4 302.5 -1.32 -42.27 1:26: 8. ! 74.5 64.2 -65.9 298.2 -2.72 -43.82 1:26:44. ! 72.6 62.1 -65.3 294.0 -4.14 -45.39 1:27:19. ! 70.6 60.5 -64.5 290.2 -5.57 -46.99 1:27:55. ! 68.7 59.3 -63.6 286.6 -7.00 -48.62 1:28:30. ! 66.7 58.3 -62.6 283.3 -8.45 -50.28 1:29: 6. ! 64.6 57.5 -61.4 280.2 -9.92 -51.99 1:29:41. ! 62.6 57.0 -60.1 277.5 -11.39 -53.75 1:30:17. ! 60.4 56.6 -58.7 275.0 -12.89 -55.56 1:30:52. ! 58.2 56.4 -57.1 272.8 -14.40 -57.45 1:31:28. ! 56.0 56.3 -55.5 270.9 -15.94 -59.41 1:32: 4. ! 53.7 56.3 -53.8 269.2 -17.50 -61.46 1:32:39. ! 51.3 56.5 -51.9 267.7 -19.09 -63.62 1:33:15. ! 48.8 56.8 -49.9 266.5 -20.70 -65.90 1:33:50. ! 46.3 57.2 -47.8 265.6 -22.36 -68.34 1:34:26. ! 43.6 57.8 -45.5 264.8 -24.05 -70.96 1:35: 1. ! 40.8 58.6 -43.1 264.4 -25.78 -73.81 1:35:37. ! 37.8 59.5 -40.5 264.2 -27.58 -76.96 1:36:12. ! 34.6 60.7 -37.6 264.3 -29.44 -80.50 1:36:48. ! 31.1 62.2 -34.5 264.8 -31.39 -84.59 1:37:23. ! 27.2 64.1 -31.0 265.7 -33.45 -89.50 1:37:59. ! 22.7 66.5 -26.8 267.3 -35.71 -95.90 1:38:34. ! 17.1 70.0 -21.6 269.9 -38.41 -106.41 1:39:10. ! 8.4 76.2 -13.5 275.2 CAMC+USNO solution: Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi° 50.34 58.15 1: 3:50. ! 10.1 266.4 -.9 69.3 49.36 45.85 1: 4:26. ! 18.0 257.0 -8.4 59.8 48.03 37.76 1: 5: 1. ! 23.4 251.0 -13.5 53.5 46.59 31.45 1: 5:37. ! 27.8 246.4 -17.6 48.6 45.10 26.21 1: 6:12. ! 31.6 242.6 -21.2 44.4 43.58 21.70 1: 6:48. ! 35.1 239.5 -24.5 40.9 42.06 17.73 1: 7:23. ! 38.3 236.7 -27.4 37.7 40.55 14.16 1: 7:59. ! 41.2 234.3 -30.1 34.8 39.04 10.93 1: 8:34. ! 44.0 232.1 -32.7 32.1 37.53 7.96 1: 9:10. ! 46.7 230.2 -35.1 29.6 36.04 5.20 1: 9:45. ! 49.2 228.3 -37.4 27.2 34.56 2.63 1:10:21. ! 51.7 226.6 -39.6 24.9 33.09 .22 1:10:56. ! 54.1 225.0 -41.7 22.7 31.64 -2.07 1:11:32. ! 56.4 223.5 -43.8 20.5 30.19 -4.23 1:12: 7. ! 58.6 222.0 -45.7 18.3 28.75 -6.30 1:12:43. ! 60.8 220.5 -47.6 16.1 27.32 -8.29 1:13:19. ! 62.9 219.1 -49.4 13.9 25.90 -10.19 1:13:54. ! 65.0 217.5 -51.1 11.6 24.49 -12.04 1:14:30. ! 67.1 216.0 -52.8 9.3 23.09 -13.82 1:15: 5. ! 69.1 214.3 -54.4 6.9 21.69 -15.56 1:15:41. ! 71.0 212.4 -55.9 4.4 20.30 -17.25 1:16:16. ! 73.0 210.3 -57.4 1.8 18.91 -18.90 1:16:52. ! 74.9 207.8 -58.8 359.0 17.53 -20.51 1:17:27. ! 76.7 204.8 -60.1 356.1 16.15 -22.10 1:18: 3. ! 78.6 201.1 -61.3 353.0 14.77 -23.67 1:18:38. ! 80.3 196.1 -62.5 349.7 13.40 -25.21 1:19:14. ! 81.9 189.3 -63.6 346.2 12.03 -26.73 1:19:49. ! 83.4 179.4 -64.5 342.5 10.66 -28.24 1:20:25. ! 84.6 164.7 -65.4 338.5 9.28 -29.74 1:21: 0. ! 85.3 144.2 -66.1 334.4 7.91 -31.24 1:21:36. ! 85.2 120.9 -66.7 330.0 6.54 -32.73 1:22:11. ! 84.5 101.2 -67.1 325.5 5.16 -34.21 1:22:47. ! 83.2 87.4 -67.4 320.8 3.78 -35.70 1:23:22. ! 81.7 78.2 -67.6 316.1 2.40 -37.20 1:23:58. ! 80.1 72.0 -67.6 311.4 1.01 -38.70 1:24:34. ! 78.3 67.6 -67.4 306.7 -.38 -40.21 1:25: 9. ! 76.5 64.4 -67.0 302.1 -1.78 -41.74 1:25:45. ! 74.6 61.9 -66.5 297.7 -3.19 -43.29 1:26:20. ! 72.7 60.1 -65.9 293.5 -4.61 -44.86 1:26:56. ! 70.8 58.7 -65.1 289.5 -6.04 -46.46 1:27:31. ! 68.8 57.6 -64.2 285.9 -7.47 -48.09 1:28: 7. ! 66.8 56.8 -63.1 282.5 -8.93 -49.75 1:28:42. ! 64.7 56.1 -61.9 279.4 -10.39 -51.46 1:29:18. ! 62.6 55.7 -60.6 276.7 -11.87 -53.22 1:29:53. ! 60.5 55.4 -59.1 274.2 -13.37 -55.04 1:30:29. ! 58.3 55.3 -57.6 272.0 -14.89 -56.92 1:31: 4. ! 56.1 55.2 -55.9 270.0 -16.43 -58.88 1:31:40. ! 53.8 55.3 -54.2 268.4 -17.99 -60.94 1:32:15. ! 51.4 55.6 -52.3 266.9 -19.58 -63.10 1:32:51. ! 48.9 55.9 -50.3 265.8 -21.20 -65.38 1:33:26. ! 46.3 56.4 -48.1 264.8 -22.86 -67.82 1:34: 2. ! 43.7 57.1 -45.9 264.1 -24.56 -70.45 1:34:37. ! 40.8 57.9 -43.4 263.7 -26.31 -73.31 1:35:13. ! 37.8 58.9 -40.8 263.5 -28.11 -76.46 1:35:48. ! 34.6 60.1 -37.9 263.7 -29.98 -80.01 1:36:24. ! 31.1 61.6 -34.8 264.2 -31.94 -84.11 1:36:60. ! 27.2 63.6 -31.2 265.2 -34.02 -89.05 1:37:35. ! 22.7 66.1 -27.1 266.8 -36.29 -95.47 1:38:11. ! 17.1 69.6 -21.9 269.4 -39.01 -106.00 1:38:46. ! 8.5 76.0 -13.8 274.8 ------------------------------------------------------------------------- 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 -------------------------------------------------------------------------

    Martin Federspiel's final update

                       Final IOTA/IOTA-ES occultation update for 
                  (219) Thusnelda/TYC 0537 00145 event on 1999 Aug 21
     visible from southeastern Europe, northwestern Africa, parts of South America
    
    
    Summary 

    The 40 km large asteroid (219) Thusnelda will occult a 9.5 mag star in the Pegasus/Equuleus region on the very early morning of 1999 Aug 21 (UT). The event will be visible for observers in southeastern Europe (Italy; near Napoli), northwestern Africa and parts of South America.

    For this revised update only USNO positions (including very recent ones) supplied by Ron Stone were used. CAMC data were rejected due to unusually large residuals when combined with the USNO data. The orbit solution from the USNO positions alone is very accurate.

    The new UNSO solution is 10 s later and about 0.3" northwest of Goffin's nominal prediction which was based on a rather old orbit for the asteroid.

    
    The event at one glimpse:
     * date and approx. UT time of event: 1999 Aug 21 @ 01h 04m - 01h 39m UT
     * magnitude of target star: 9.45
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7s
     * rough path description: Ukrainia, Romania, former Yogoslawia, Italy,
       south of Sardinia, Algeria, border Algeria/Morocco, Western Sahara,
       Brazil, Bolivia, northern Chile
    
    The occultation path:
     * approximate widths [km]: 45
     * more detailed path description: see map and table
     * uncertainty [path widths]: 1.2
     * map: attached
     * remarks: USNO solution with very recent positions has improved accuracy
       compared to earlier update
    
    Data for the target star:
     * name: TYC 0537 00145
     * constellation: border Pegasus/Equuleus
     * J2000 position [h,m,s; °,',"]: RA 21 28 53.218 DE +5 25 44.69
     * position source: ACT
     * estimated accuracy ["]: 0.03
     * V mag [mag]: 9.45
     * remarks: quality flag 3 in Tycho catalogue (good quality)
    
    Data for the minor planet:
     * general information:
         mumber, name: (219) Thusnelda
         approx. diameter [km]: 40
     * orbital information
         orbit source: Federspiel
         source of used astrometry: USNO
         number of used observations: 32
         number of rejected observations: 0
         time covered by the observations: 1998 Feb -1999 Aug 14
         rms residuals ["] (RA,DE): (0.08",0.08")
         estimated positional accuracy at epoch of event ["]: 0.08"
         remarks: very good orbit
    
    Data for the event:
     * UT date and time of least geocentric approach: 1999 Aug 21 @ 1h 21m 39s UT (USNO);
                                                                    1h 21m 16s (CAMC+USNO)
     * least geocentric distance ["]: 0.91" (USNO)
     * uncertainty in time [s]: 9
     * approx. V mag of minor planet at event [mag]: 11.0
     * geocentric parallax of minor planet ["]: 10.29
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7
     * apparent motion of minor planet ["/h]: 34.76
     * angular distance to moon, phase of moon [°,%]: 67°, 68%+
     * remarks: 
    
    Calculator(s): Martin Federspiel
    
    

    Final updated path location for (219) Thusnelda on August 21, 1999 Path coordinates: improved USNO solution: Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi° 50.76 58.64 1: 4:14. ! 9.7 266.8 -.4 69.8 49.80 45.96 1: 4:50. ! 17.8 257.1 -8.0 60.0 48.46 37.72 1: 5:25. ! 23.2 250.9 -13.2 53.5 47.01 31.33 1: 6: 1. ! 27.6 246.2 -17.4 48.5 45.51 26.04 1: 6:36. ! 31.5 242.3 -21.0 44.3 43.99 21.48 1: 7:12. ! 34.9 239.1 -24.2 40.6 42.46 17.48 1: 7:47. ! 38.1 236.3 -27.2 37.4 40.94 13.89 1: 8:23. ! 41.1 233.8 -29.9 34.5 39.42 10.64 1: 8:58. ! 43.9 231.6 -32.5 31.8 37.91 7.65 1: 9:34. ! 46.6 229.6 -34.9 29.2 36.41 4.89 1:10: 9. ! 49.1 227.8 -37.2 26.8 34.93 2.31 1:10:45. ! 51.6 226.0 -39.4 24.5 33.45 -.11 1:11:20. ! 54.0 224.4 -41.5 22.3 31.99 -2.40 1:11:56. ! 56.3 222.8 -43.5 20.0 30.54 -4.57 1:12:31. ! 58.5 221.3 -45.4 17.8 29.09 -6.65 1:13: 7. ! 60.7 219.7 -47.3 15.6 27.66 -8.63 1:13:42. ! 62.8 218.2 -49.1 13.4 26.24 -10.55 1:14:18. ! 64.9 216.6 -50.8 11.2 24.82 -12.39 1:14:53. ! 66.9 215.0 -52.5 8.8 23.42 -14.18 1:15:29. ! 68.9 213.2 -54.1 6.4 22.01 -15.91 1:16: 4. ! 70.9 211.2 -55.6 3.9 20.62 -17.60 1:16:40. ! 72.8 209.0 -57.1 1.3 19.23 -19.25 1:17:15. ! 74.7 206.4 -58.4 358.5 17.85 -20.87 1:17:51. ! 76.6 203.3 -59.8 355.6 16.47 -22.46 1:18:26. ! 78.3 199.3 -61.0 352.5 15.09 -24.02 1:19: 2. ! 80.1 194.2 -62.1 349.3 13.71 -25.57 1:19:38. ! 81.7 187.2 -63.2 345.8 12.34 -27.09 1:20:13. ! 83.1 177.3 -64.1 342.1 10.97 -28.60 1:20:49. ! 84.2 163.1 -65.0 338.2 9.60 -30.10 1:21:24. ! 84.9 143.9 -65.7 334.1 8.22 -31.60 1:21:60. ! 84.8 122.4 -66.3 329.8 6.85 -33.08 1:22:35. ! 84.1 103.7 -66.7 325.4 5.47 -34.57 1:23:11. ! 83.0 90.0 -67.0 320.8 4.09 -36.06 1:23:46. ! 81.5 80.6 -67.2 316.2 2.71 -37.55 1:24:22. ! 79.9 74.1 -67.2 311.5 1.32 -39.06 1:24:57. ! 78.2 69.4 -67.0 306.9 -.07 -40.57 1:25:33. ! 76.4 66.0 -66.7 302.4 -1.47 -42.10 1:26: 8. ! 74.5 63.4 -66.2 298.0 -2.88 -43.64 1:26:44. ! 72.7 61.4 -65.5 293.9 -4.30 -45.21 1:27:19. ! 70.7 59.9 -64.7 290.0 -5.72 -46.81 1:27:55. ! 68.8 58.7 -63.8 286.4 -7.16 -48.44 1:28:30. ! 66.8 57.7 -62.8 283.0 -8.61 -50.10 1:29: 6. ! 64.7 57.0 -61.6 280.0 -10.07 -51.81 1:29:41. ! 62.6 56.5 -60.3 277.2 -11.55 -53.57 1:30:17. ! 60.5 56.2 -58.9 274.7 -13.05 -55.38 1:30:52. ! 58.3 56.0 -57.3 272.5 -14.56 -57.26 1:31:28. ! 56.1 55.9 -55.7 270.6 -16.10 -59.22 1:32: 3. ! 53.7 55.9 -53.9 268.9 -17.66 -61.27 1:32:39. ! 51.4 56.1 -52.1 267.4 -19.25 -63.43 1:33:14. ! 48.9 56.5 -50.1 266.3 -20.87 -65.71 1:33:50. ! 46.3 56.9 -48.0 265.3 -22.52 -68.15 1:34:25. ! 43.7 57.5 -45.7 264.6 -24.21 -70.77 1:35: 1. ! 40.8 58.3 -43.3 264.1 -25.95 -73.62 1:35:36. ! 37.9 59.3 -40.6 264.0 -27.75 -76.76 1:36:12. ! 34.6 60.5 -37.8 264.1 -29.61 -80.30 1:36:48. ! 31.1 62.0 -34.7 264.6 -31.56 -84.38 1:37:23. ! 27.2 63.9 -31.1 265.5 -33.63 -89.28 1:37:59. ! 22.7 66.3 -27.0 267.1 -35.88 -95.66 1:38:34. ! 17.2 69.8 -21.8 269.7 -38.58 -106.03 1:39:10. ! 8.7 76.0 -13.8 274.9 ------------------------------------------------------------------------- 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 -------------------------------------------------------------------------

    Jan Manek's update

                         IOTA/IOTA-ES occultation update for
              (219) Thusnelda / SAO 126822 event on August 20/21, 1999
         visible from Ukraina, Romania, Italy, NW Africa and south America
    
    
    Summary 

    In the night August 20/21, 1999 a 9.4 mag star SAO 126822 will be occulted by a 44 km asteroid (219) Thusnelda. This update is based on USNO/Flagstaff astrometry for the asteroid and TRC star position.

    The updated path runs ~4 path width north with time ~0.1 minute earlier compared to Goffin's nominal prediction. Of the euro-region the most promising conditions are in middle Italy.

    The path runs over SE Ukraina ~01:05.5 UT, Moldavia, Romania ~01:06.5 UT, former Yugoslavia, middle Italy north of Napoli ~01:08 UT and very south of Sardegna at ~01:09 UT. After that it runs over NW part of Africa, crosses Atlantic ocean and runs over Brasil 01:26 - 01:32 UT, SE Bolivia ~01:33 UT and north Chile and Antofagasta at ~01:34.5 UT.

    
    The event at one glimpse:
     * date and approx. UT time of event: August 21, 1999 @ 01:08 UT (Italy)
     * magnitude of target star: 9.4
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7.3
     * path description: Path runs over SE Ukraina ~01:05.5 UT, Moldavia, Romania 
         ~01:06.5 UT, former Yugoslavia, middle Italy north of Napoli ~01:08 UT and
         very south of Sardegna at ~01:09 UT. After that it runs over NW part of 
         Africa, crosses Atlantic ocean and runs over Brasil 01:26 - 01:32 UT, SE 
         Bolivia ~01:33 UT and north Chile and Antofagasta at ~01:34.5 UT. 
    
    The occultation path:
     * approximate width [km]: 45
     * uncertainty [path widths]: 1.4
     * uncertainty in time [s]: 15
     * map: attached
     * remarks: Path uncertainities are given according to nominal star position 
        errors and expected asteroid positional accuracy. 
        !!!!!!!
        Circles along the path are OCCULT exactly calculated centerline points. 
        !!!!!!!
    
    Data for the target star:
     * name: SAO 126822 = PPM 171802 = TYC 0537 00145 1
     * constellation: Pegasus
     * J2000 position [h,m,s; o,',"]: 21h 28m 53.217s; +05o 25' 44.72"
     * position source: TRC1.0
     * estimated accuracy ["]: 0.03" (0.02", 0.02")
     * V mag [mag]: 9.40
     * B-V [mag]: +0.44
     * remarks: TYCHO gives quality flag 3 (high) together with 'no duplicity' flag.
    
         Target star is near Peg/Equ border, 6.8 degrees almost exactly south of 
         globular cluster M15. There is 8.3 mag star SAO 126829 about 7.5' east of 
         target star.
    
    Data for the minor planet:
     * general information:
         number, name: (219) Thusnelda
         approx. diameter [km]: 44
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 32 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 02 12 - 1999 08 14
         rms residuals ["] (RA,DE): 0.07", 0.08"
         estimated positional accuracy at epoch of event ["]: 0.07"
         remarks: 
    
    Data for the event:
     * UT date and time of least geocentric approach: 01:21:27 UT
     * approx. V mag of minor planet at event [mag]: 11.0
     * geocentric parallax of minor planet ["]: 10.285
     * magnitude drop [mag]: 1.8
     * estimated maximum duration [s]: 7.3
     * apparent motion of minor planet ["/h]: 34.77
     * angular distance to moon, phase of moon [deg,%]: 68, 68%
     * remarks: 
    
    Calculator(s): Jan Manek
    
    

    Updated path location for (219) Thusnelda on August 20/21, 1999 - Euro Path coordinates: Altitude E. Longitude Latitude U.T. star sun + 50 00 00 + 50 34 23 1 04 24 15 -6 + 48 00 00 + 50 22 07 1 04 31 16 -7 + 46 00 00 + 50 07 53 1 04 38 18 -8 + 44 00 00 + 49 51 41 1 04 45 19 -9 + 42 00 00 + 49 33 29 1 04 53 20 -10 + 40 00 00 + 49 13 13 1 05 02 22 -12 + 38 00 00 + 48 50 51 1 05 12 23 -13 + 36 00 00 + 48 26 21 1 05 22 24 -14 + 34 00 00 + 47 59 39 1 05 33 26 -16 + 32 00 00 + 47 30 43 1 05 44 27 -17 + 30 00 00 + 46 59 28 1 05 57 28 -18 + 28 00 00 + 46 25 51 1 06 10 30 -20 + 26 00 00 + 45 49 48 1 06 24 31 -21 + 24 00 00 + 45 11 16 1 06 39 33 -22 + 22 00 00 + 44 30 09 1 06 55 34 -24 + 20 00 00 + 43 46 25 1 07 11 36 -25 + 18 00 00 + 42 59 58 1 07 29 38 -27 + 16 00 00 + 42 10 45 1 07 48 39 -28 + 14 00 00 + 41 18 41 1 08 08 41 -30 + 12 00 00 + 40 23 43 1 08 30 43 -31 + 10 00 00 + 39 25 47 1 08 52 44 -33 + 8 00 00 + 38 24 50 1 09 16 46 -34 + 6 00 00 + 37 20 49 1 09 41 48 -36 + 4 00 00 + 36 13 40 1 10 07 50 -38 + 2 00 00 + 35 03 24 1 10 35 52 -40 + 0 00 00 + 33 49 58 1 11 04 54 -41 - 2 00 00 + 32 33 22 1 11 35 56 -43 - 4 00 00 + 31 13 36 1 12 07 58 -45 ........ shortened .......................... - 40 00 00 + 0 34 05 1 25 04 77 -67 - 42 00 00 - 1 16 44 1 25 51 75 -66 - 44 00 00 - 3 06 37 1 26 37 72 -65 - 46 00 00 - 4 55 15 1 27 22 70 -64 - 48 00 00 - 6 42 24 1 28 06 67 -63 - 50 00 00 - 8 27 48 1 28 49 65 -62 - 52 00 00 - 10 11 13 1 29 30 62 -60 - 54 00 00 - 11 52 27 1 30 10 60 -58 - 56 00 00 - 13 31 18 1 30 49 58 -57 - 58 00 00 - 15 07 35 1 31 26 55 -55 - 60 00 00 - 16 41 11 1 32 02 53 -53 - 62 00 00 - 18 11 57 1 32 36 51 -51 - 64 00 00 - 19 39 46 1 33 08 48 -49 - 66 00 00 - 21 04 34 1 33 39 46 -48 - 68 00 00 - 22 26 17 1 34 08 44 -46 - 70 00 00 - 23 44 52 1 34 36 42 -44 - 72 00 00 - 25 00 16 1 35 01 40 -42 - 74 00 00 - 26 12 30 1 35 26 37 -40 - 76 00 00 - 27 21 32 1 35 48 35 -38 - 78 00 00 - 28 27 24 1 36 10 33 -37 ........ shortened .......................... ---------------------------------------------------------------------------- Jan Manek Stefanik Observatory Private : Petrin 205 Werichova 950 118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_| Czech Republic Czech Republic / \ Internet : jmanek@mbox.vol.cz |-O-O-| --------------------------------------------------------------------U---U---

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