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
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
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
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-|
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