Update for (1036) Ganymed - September 24, 1998
Update computed by Martin Federspiel; issued 19 Sep 1998 12:53:06 +0200 (CEST)
Martin Federspiel's update
IOTA/IOTA-ES occultation update for
(1036) Ganymed/TAC+40°1526 event on 1998 Sep 24
visible from Spain and Portugal
Summary
On the early morning of Sep 24 UT the fast moving asteroid Ganymed
will occult an 11 mag star in Perseus for observers in Spain and
Portugal. The event will be difficult to observe due to the faintness
of the target star and the small magnitude drop. Photoelectric
measurement is recommended.
The event at one glimpse:
* date and approx. UT time of event: 1998 Sep 24, 3h 30m UT
* magnitude of target star: 10.9
* magnitude drop [mag]: 0.4
* estimated maximum duration [s]: 3.5
* rough path description: northwestern Spain, northeastern Portugal,
Gibraltar, Morokko, western Algeria, central Africa
The occultation path:
* approximate widths [km]: 40
* more detailed path description: Santiago de Compostela/ES (3:30:7),
Vila Real/PT, Merida/ES, 50 km east of Sevilla, Marbella (3:31:10)
no further details given due to lack of observers in Africa
* uncertainty [path widths]: 4
* map: XEphem map attached
* remarks: path shifted about 100 km or 2.5 pathwidths eastward compared
to Goffin's nominal prediction due to new orbit
Data for the target star:
* name: TAC+40° 1526
* constellation: Perseus (near epsilon Per)
* J2000 position [h,m,s; °,',"]: 3 55 32.447; +40 56 58.97
* position source: TAC 10
* estimated accuracy ["]: 0.3
* V mag [mag]: 10.9
* remarks: no Hipparcos/ACT/USNO position available
Data for the minor planet:
* general information:
mumber, name: (1036) Ganymed
approx. diameter [km]: 41
* orbital information
orbit source: own calculation
source of used astrometry: USNO, TMO
number of used observations: 24 USNO +1 TMO
number of rejected observations: 3
time covered by the observations: 1998 June 29 - 1998 Aug 29
rms residuals ["] (RA,DE): 0.06, 0.06
estimated positional accuracy at epoch of event ["]: 0.1
remarks:
Data for the event:
* UT date and time of least geocentric approach: 1998 Sep 24 @ 3h 30m 58s UT
* least geocentric distance ["]: 2.35
* uncertainty in time [s]: 9
* approx. V mag of minor planet at event [mag]: 10.0
* geocentric parallax of minor planet ["]: 17.64
* magnitude drop [mag]: 0.4
* estimated maximum duration [s]: 3.5
* apparent motion of minor planet ["/h]: 117.8
* angular distance to moon, phase of moon [°,%]: 144, 11+
* remarks:
Calculator(s): Martin Federspiel
Path coordinates:
Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi°
53.58 -124.63 3:22:20. ! 13.8 36.5 -10.8 284.4
58.40 -116.96 3:22:38. ! 20.3 42.8 -13.4 292.1
61.61 -109.60 3:22:56. ! 25.2 49.2 -15.4 299.7
63.91 -102.14 3:23:14. ! 29.3 55.7 -17.0 307.5
65.53 -94.51 3:23:32. ! 33.0 62.5 -18.4 315.5
66.60 -86.79 3:23:50. ! 36.3 69.4 -19.6 323.7
67.20 -79.14 3:24: 8. ! 39.3 76.3 -20.7 331.9
67.39 -71.71 3:24:26. ! 42.2 82.9 -21.7 339.9
67.23 -64.67 3:24:44. ! 44.9 89.1 -22.6 347.5
66.77 -58.13 3:25: 2. ! 47.5 94.8 -23.5 354.6
66.07 -52.16 3:25:20. ! 50.0 99.9 -24.3 1.2
65.17 -46.77 3:25:38. ! 52.4 104.4 -25.0 7.3
64.10 -41.94 3:25:56. ! 54.7 108.3 -25.7 12.8
62.91 -37.63 3:26:14. ! 57.0 111.5 -26.3 17.8
61.62 -33.79 3:26:32. ! 59.2 114.2 -26.9 22.3
60.25 -30.37 3:26:50. ! 61.3 116.4 -27.5 26.4
58.82 -27.31 3:27: 8. ! 63.3 118.0 -28.0 30.2
57.34 -24.57 3:27:25. ! 65.4 119.2 -28.4 33.7
55.82 -22.11 3:27:43. ! 67.3 119.9 -28.9 37.0
54.26 -19.88 3:28: 1. ! 69.2 120.0 -29.3 39.9
52.68 -17.86 3:28:19. ! 71.1 119.6 -29.6 42.8
51.08 -16.02 3:28:37. ! 72.9 118.6 -30.0 45.4
49.46 -14.34 3:28:55. ! 74.7 116.8 -30.3 47.9
47.82 -12.80 3:29:13. ! 76.3 114.1 -30.5 50.2
46.17 -11.38 3:29:31. ! 77.9 110.2 -30.8 52.5
44.50 -10.06 3:29:49. ! 79.3 104.7 -31.0 54.6
42.82 -8.84 3:30: 7. ! 80.6 97.3 -31.1 56.6
41.13 -7.70 3:30:25. ! 81.6 87.6 -31.3 58.6
39.43 -6.63 3:30:43. ! 82.2 75.6 -31.4 60.5
37.71 -5.63 3:31: 1. ! 82.4 62.3 -31.5 62.3
35.99 -4.69 3:31:19. ! 82.0 49.1 -31.5 64.1
34.24 -3.80 3:31:37. ! 81.3 37.5 -31.5 65.9
32.49 -2.95 3:31:55. ! 80.3 28.1 -31.5 67.5
30.71 -2.15 3:32:13. ! 78.9 20.9 -31.5 69.2
28.92 -1.38 3:32:31. ! 77.5 15.3 -31.4 70.8
27.11 -.65 3:32:49. ! 75.9 11.0 -31.3 72.3
25.28 .05 3:33: 7. ! 74.2 7.7 -31.2 73.9
23.42 .73 3:33:25. ! 72.4 5.0 -31.0 75.4
21.54 1.38 3:33:43. ! 70.6 2.9 -30.8 76.8
19.64 2.02 3:34: 1. ! 68.7 1.2 -30.6 78.3
17.70 2.63 3:34:19. ! 66.8 359.8 -30.3 79.7
15.73 3.24 3:34:37. ! 64.8 358.6 -30.0 81.1
13.71 3.83 3:34:55. ! 62.8 357.6 -29.6 82.4
11.66 4.41 3:35:13. ! 60.7 356.7 -29.3 83.8
9.56 4.98 3:35:31. ! 58.5 356.0 -28.8 85.1
7.41 5.55 3:35:49. ! 56.3 355.4 -28.4 86.4
5.19 6.11 3:36: 7. ! 54.1 354.8 -27.8 87.7
2.90 6.68 3:36:25. ! 51.7 354.3 -27.3 88.9
.54 7.26 3:36:42. ! 49.3 353.8 -26.6 90.1
-1.92 7.84 3:37: 0. ! 46.8 353.4 -25.9 91.3
-4.49 8.44 3:37:18. ! 44.2 353.0 -25.2 92.5
-7.19 9.06 3:37:36. ! 41.4 352.6 -24.3 93.7
-10.05 9.71 3:37:54. ! 38.5 352.2 -23.4 94.8
-13.12 10.40 3:38:12. ! 35.3 351.8 -22.4 95.9
-16.44 11.16 3:38:30. ! 31.9 351.4 -21.2 97.0
-20.12 12.00 3:38:48. ! 28.2 350.9 -19.9 98.0
-24.33 12.98 3:39: 6. ! 23.9 350.4 -18.3 99.0
-29.43 14.22 3:39:24. ! 18.7 349.7 -16.3 99.9
-36.60 16.11 3:39:42. ! 11.3 348.5 -13.4 100.6
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Martin Federspiel ******** E-mail: martin@astro.unibas.ch
Astronomisches Institut ******** oder: federspi@astro.unibas.ch
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