Update for (921) Jovita - September 22, 1998
Update computed by Martin Federspiel; issued 18 Sep 1998 15:18:43 +0200 (CEST)
Update computed by Jan Manek; issued 18 Sep 1998 16:15:44 +0200 (CEST)
Martin Federspiel's update
IOTA/IOTA-ES occultation update for
(921) Jovita/ACT 832635 event on 1998 Sep 22
Data for the minor planet:
* general information
mumber, name: (921) Jovita
approx. diameter [km]: 60.5 (IRAS)
* orbital information
orbit source: computation Federspiel 1998 Sep 18
source of used astrometry: Ron Stone (USNO/Flagstaff)
number of used observations: 22
number of rejected observations: 1 (1998 June 16)
time covered by the observations: 1998 June 18 - 1998 Sep 17
rms residuals ["] (RA,DE): 0.06,0.05
estimated positional accuracy at epoch of event ["]: 0.07
remarks: very good orbit
Data for the target star:
* name: ACT 832635 = TYC 0495 01755
* constellation: Aql
* J2000 position [h,m,s; °,',"]: RA 20 13 44.709 DE +0 1 4.87
* position source: ACT
* estimated accuracy ["]: 0.05
* V mag [mag]: 9.95
* remarks:
Data for the event:
* UT date and time of least geocentric approach: 1998 Sep 22 @ 17h 55m 38s
* least geocentric distance [",angle]: 0.83" @ 66.8°
* uncertainty in time [s]: 12
* approx. V mag of minor planet at event [mag]: 14.8
* geocentric parallax of minor planet ["]: 4.2
* magnitude drop [mag]: 4.9
* estimated maximum duration [s]: 7
* apparent motion of minor planet ["/h]: 21.1
* angular distance to moon, phase of moon [°,%]: 102°, 4%+
* remarks:
Occultation path:
* approximate widths [km]: 60
* path goes over/crosses: Scandinavia, Russia, Black Sea, Turkey, Cyprus,
border Israel/Egypt, Elat/Aqaba, north western Saudi Arabia, Etiopia
* uncertainty [path widths]: 2.5
* map: XEphem map
* remarks: occultation path coordinates attached below
Calculator(s): Martin Federspiel
Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi°
73.16 -4.70 17:44:15. ! 12.8 138.1 2.2 263.5
67.88 8.02 17:44:39. ! 19.5 150.3 -2.1 275.6
63.60 14.27 17:45: 3. ! 24.5 156.3 -5.3 281.2
59.89 18.28 17:45:27. ! 28.7 160.1 -8.0 284.4
56.55 21.18 17:45:51. ! 32.3 162.9 -10.4 286.5
53.48 23.44 17:46:14. ! 35.6 165.1 -12.6 287.9
50.62 25.29 17:46:38. ! 38.7 167.0 -14.7 288.9
47.92 26.86 17:47: 2. ! 41.6 168.7 -16.6 289.6
45.36 28.21 17:47:26. ! 44.3 170.3 -18.4 290.0
42.91 29.42 17:47:50. ! 46.8 171.7 -20.1 290.2
40.55 30.51 17:48:14. ! 49.3 173.1 -21.8 290.3
38.28 31.50 17:48:38. ! 51.6 174.6 -23.3 290.2
36.07 32.42 17:49: 2. ! 53.9 176.0 -24.9 290.0
33.92 33.27 17:49:25. ! 56.1 177.5 -26.3 289.7
31.83 34.08 17:49:49. ! 58.2 179.1 -27.7 289.3
29.78 34.85 17:50:13. ! 60.2 180.7 -29.1 288.8
27.77 35.58 17:50:37. ! 62.2 182.6 -30.4 288.3
25.80 36.29 17:51: 1. ! 64.2 184.6 -31.7 287.7
23.86 36.97 17:51:25. ! 66.0 186.9 -33.0 286.9
21.95 37.63 17:51:49. ! 67.8 189.4 -34.2 286.2
20.07 38.28 17:52:13. ! 69.5 192.4 -35.4 285.3
18.20 38.92 17:52:36. ! 71.2 195.8 -36.5 284.4
16.36 39.55 17:53: 0. ! 72.7 199.7 -37.7 283.3
14.54 40.17 17:53:24. ! 74.1 204.4 -38.7 282.3
12.73 40.79 17:53:48. ! 75.4 209.9 -39.8 281.1
10.93 41.40 17:54:12. ! 76.6 216.3 -40.8 279.8
9.14 42.02 17:54:36. ! 77.5 223.8 -41.8 278.5
7.36 42.64 17:54:60. ! 78.1 232.2 -42.7 277.1
5.59 43.26 17:55:23. ! 78.5 241.4 -43.6 275.6
3.83 43.90 17:55:47. ! 78.5 250.8 -44.5 274.0
2.06 44.54 17:56:11. ! 78.3 260.1 -45.4 272.4
.30 45.19 17:56:35. ! 77.7 268.7 -46.2 270.6
-1.46 45.86 17:56:59. ! 76.9 276.3 -46.9 268.7
-3.22 46.54 17:57:23. ! 75.8 282.9 -47.6 266.7
-4.98 47.24 17:57:47. ! 74.5 288.4 -48.3 264.7
-6.75 47.96 17:58:11. ! 73.1 293.1 -48.9 262.5
-8.53 48.71 17:58:34. ! 71.6 296.9 -49.5 260.2
-10.31 49.49 17:58:58. ! 70.0 300.1 -50.0 257.8
-12.10 50.30 17:59:22. ! 68.3 302.7 -50.4 255.3
-13.91 51.14 17:59:46. ! 66.6 304.9 -50.8 252.6
-15.73 52.03 18: 0:10. ! 64.7 306.6 -51.1 249.9
-17.57 52.97 18: 0:34. ! 62.8 308.1 -51.4 247.0
-19.42 53.96 18: 0:58. ! 60.8 309.2 -51.5 244.0
-21.30 55.01 18: 1:22. ! 58.8 310.1 -51.6 240.9
-23.20 56.13 18: 1:45. ! 56.7 310.8 -51.6 237.6
-25.13 57.34 18: 2: 9. ! 54.6 311.2 -51.5 234.2
-27.09 58.65 18: 2:33. ! 52.3 311.5 -51.3 230.7
-29.09 60.07 18: 2:57. ! 50.0 311.5 -51.0 227.0
-31.12 61.63 18: 3:21. ! 47.6 311.3 -50.6 223.1
-33.20 63.36 18: 3:45. ! 45.0 310.9 -50.1 219.1
-35.33 65.29 18: 4: 9. ! 42.4 310.3 -49.4 214.9
-37.52 67.47 18: 4:33. ! 39.6 309.4 -48.5 210.4
-39.77 69.98 18: 4:56. ! 36.6 308.1 -47.5 205.6
-42.10 72.92 18: 5:20. ! 33.3 306.5 -46.2 200.4
-44.52 76.45 18: 5:44. ! 29.8 304.2 -44.7 194.6
-47.05 80.84 18: 6: 8. ! 25.8 301.3 -42.9 187.9
-49.70 86.61 18: 6:32. ! 21.1 297.0 -40.5 179.9
-52.50 95.05 18: 6:56. ! 15.1 290.5 -37.2 169.2
-55.50 114.51 18: 7:20. ! 3.4 274.7 -30.1 146.9
-------------------------------------------------------------------------
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
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Jan Manek's update
Hi all,
on September 22, 1998 is predicted occultation of TYC 0495 01755 by (921) Jovita. I have just
finished reduction of astrometry by Ron Stone (USNO/Flagstaff) using 22 of his 23 positions covering
three months, rejecting the one from June 16, for computation of new good quality orbit
(RMS 0.06", 0.05" in R.A. and DE respectively). Together with ACT star position this update leads to
very slight eastward shift and time correction about +2 minute compared to Goffin's nominal prediction.
Uncertainity of this prediction should not more than 0.1" or 150km.
The updated path runs currently across southern Sweden (17:45:30 UT, twilight),
eastern Poland (17:46:30 UT), western Ukraina, Romania (17:47:30 UT), eastern Bulgaria, western Turkey
(17:48:30 UT), just misses Cyprus and runs over Sinai peninsula (17:50 UT) and more to the south.
Taking into account the uncertainty, also observers in Litua, Belarus, eastern Slovakia and middle
East should try to observe this event.
Path coordinates according to OCCULT 4.07 for northern hemisphere are listed below.
Occultation of TYC 0495 01755 by 921 Jovita on 1998 Sep 22
E. Longitude Latitude U.T. star sun
+ 11 00 00 + 63 43 02 17 45 14 24 -4
+ 13 00 00 + 62 10 16 17 45 24 26 -5
+ 15 00 00 + 60 26 00 17 45 35 28 -6
+ 17 00 00 + 58 28 32 17 45 48 30 -8
+ 19 00 00 + 56 15 51 17 46 05 32 -9
+ 21 00 00 + 53 45 44 17 46 24 35 -11
+ 23 00 00 + 50 55 45 17 46 48 38 -13
+ 25 00 00 + 47 43 22 17 47 16 42 -16
+ 27 00 00 + 44 06 12 17 47 50 45 -18
+ 29 00 00 + 40 02 20 17 48 31 50 -21
+ 31 00 00 + 35 30 53 17 49 19 54 -24
+ 33 00 00 + 30 32 44 17 50 16 60 -27
+ 35 00 00 + 25 11 08 17 51 20 65 -31
+ 37 00 00 + 19 32 05 17 52 30 70 -34
+ 39 00 00 + 13 43 52 17 53 45 75 -38
+ 41 00 00 + 7 55 58 17 55 02 79 -41
+ 43 00 00 + 2 17 19 17 56 17 80 -44
I wish you clear skies, Jan
----------------------------------------------------------------------------
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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