Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
+ 13 00 00 + 22 53 44 3 48 34 18 -19
+ 11 00 00 + 23 45 02 3 48 41 20 -20
+ 9 00 00 + 24 38 27 3 48 49 22 -22
+ 7 00 00 + 25 33 54 3 48 58 24 -23
+ 5 00 00 + 26 31 18 3 49 07 25 -25
+ 3 00 00 + 27 30 32 3 49 17 27 -26
+ 1 00 00 + 28 31 31 3 49 28 29 -28
- 1 00 00 + 29 34 08 3 49 39 31 -29
- 3 00 00 + 30 38 17 3 49 51 32 -30
- 5 00 00 + 31 43 49 3 50 03 34 -31
- 7 00 00 + 32 50 38 3 50 15 35 -32
- 9 00 00 + 33 58 33 3 50 28 37 -33
- 11 00 00 + 35 07 27 3 50 42 38 -34
- 13 00 00 + 36 17 10 3 50 56 39 -35
- 15 00 00 + 37 27 32 3 51 10 41 -35
- 17 00 00 + 38 38 24 3 51 24 42 -36
- 19 00 00 + 39 49 36 3 51 38 43 -36
- 21 00 00 + 41 00 56 3 51 53 44 -36
- 23 00 00 + 42 12 14 3 52 07 44 -36
- 25 00 00 + 43 23 20 3 52 22 45 -37
- 27 00 00 + 44 34 03 3 52 37 46 -37
- 29 00 00 + 45 44 12 3 52 51 46 -36
- 31 00 00 + 46 53 38 3 53 06 46 -36
- 33 00 00 + 48 02 11 3 53 20 47 -36
- 35 00 00 + 49 09 42 3 53 34 47 -36
- 37 00 00 + 50 16 01 3 53 47 47 -35
- 39 00 00 + 51 21 01 3 54 01 47 -35
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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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Martin Federspeil's final update
IOTA/IOTA-ES occultation update for
(1015) Christa/HIP 57721 event on 1999 March 26
visible from Atlantic Ocean, Morocco
Summary
On the early morning (4 UT) the 100 km large minor planet (1015) Christa will occult the 8.6 mag star HIP 57721 in Leo for observers in Morocco. As already discussed by Jan Manek in his preliminary update for the event there is a significant south shift of the path compared to Edwin Goffin's nominal prediction. The updated path will probably neither touch continental Europe nor the Canary Islands. This update is based on an orbit for Christa calculated from accurate and recent USNO positions as well as a very accurate position of the star (Hipparcos catalogue).
The event at one glimpse:
* date and approx. UT time of event: 1999 March 26 @ 3 54 UT
* magnitude of target star: 8.55
* magnitude drop [mag]: 5.5
* estimated maximum duration [s]: 7.4
* rough path description: northwestern Africa, Morocco, Atlantic ocean,
Labrador Sea, Baffin Island
The occultation path:
* approximate widths [km]: 120
* more detailed path description: northwestern Africa, Morocco, Atlantic ocean,
Labrador Sea, Baffin Island
* uncertainty [path widths]: 2.5
* map: attached
* remarks: path about 7 path widths south of Goffin's nominal prediction,
0.7 minutes earlier
Data for the target star:
* name: HIP 57721
* constellation: Leo, near Denebola (Beta Leonis)
* J2000 position [h,m,s; °,',"]: RA 11 50 14.493, DE +13 00 49.23
* position source: Hipparcos
* estimated accuracy ["]: 0.01
* V mag [mag]: 8.55
* remarks:
Data for the minor planet:
* general information:
mumber, name: (1015) Christa
approx. diameter [km]: 100
* orbital information
orbit source: Federspiel
source of used astrometry: 16 (13) USNO positions
number of used observations: 16 (13)
number of rejected observations: 0 (3)
time covered by the observations: 1998 March 10 - 1999 March 22
rms residuals ["] (RA,DE): 0.14/0.12 (0.12/0.09)
estimated positional accuracy at epoch of event ["]: 0.15
remarks: two solutions with 0 or 3 rejected observations yield
very similar times and paths
Data for the event:
* UT date and time of least geocentric approach: 1999 3 26 @ 3 53 50.UT
* least geocentric distance ["]: 2.46
* uncertainty in time [s]: 20
* approx. V mag of minor planet at event [mag]: 14.0
* geocentric parallax of minor planet ["]: 3.63
* magnitude drop [mag]: 5.5
* estimated maximum duration [s]: 7.4
* apparent motion of minor planet ["/h]: 27.91
* angular distance to moon, phase of moon [°,%]: 57°, 69%+
* remarks:
Calculator(s): Martin Federspiel
Path coordinates:
Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi°
18.84 22.18 3:48:13. ! 9.1 280.8 -10.9 84.1
21.23 15.52 3:48:29. ! 15.5 278.2 -16.8 81.0
23.13 10.90 3:48:45. ! 19.9 276.1 -20.6 78.4
24.83 7.10 3:49: 0. ! 23.5 274.0 -23.5 75.9
26.41 3.78 3:49:16. ! 26.5 271.9 -25.9 73.4
27.91 .78 3:49:31. ! 29.1 269.8 -28.0 71.0
29.36 -2.00 3:49:47. ! 31.5 267.7 -29.7 68.5
30.76 -4.62 3:50: 3. ! 33.6 265.4 -31.2 65.9
32.13 -7.11 3:50:18. ! 35.5 263.1 -32.5 63.3
33.47 -9.50 3:50:34. ! 37.2 260.6 -33.6 60.7
34.79 -11.82 3:50:49. ! 38.8 258.1 -34.5 58.0
36.09 -14.07 3:51: 5. ! 40.3 255.4 -35.3 55.3
37.38 -16.28 3:51:21. ! 41.6 252.6 -35.9 52.6
38.66 -18.46 3:51:36. ! 42.7 249.8 -36.4 49.8
39.93 -20.61 3:51:52. ! 43.8 246.8 -36.8 47.0
41.18 -22.75 3:52: 8. ! 44.7 243.7 -37.0 44.1
42.44 -24.88 3:52:23. ! 45.4 240.5 -37.1 41.2
43.69 -27.02 3:52:39. ! 46.1 237.2 -37.1 38.3
44.94 -29.16 3:52:54. ! 46.6 233.7 -37.0 35.4
46.18 -31.33 3:53:10. ! 47.0 230.2 -36.8 32.5
47.42 -33.53 3:53:26. ! 47.3 226.6 -36.5 29.5
48.67 -35.77 3:53:41. ! 47.4 222.9 -36.1 26.5
49.92 -38.05 3:53:57. ! 47.4 219.2 -35.6 23.5
51.16 -40.39 3:54:12. ! 47.3 215.4 -35.0 20.5
52.42 -42.81 3:54:28. ! 47.0 211.5 -34.3 17.4
53.67 -45.31 3:54:44. ! 46.7 207.5 -33.4 14.3
54.93 -47.91 3:54:59. ! 46.2 203.5 -32.5 11.1
56.19 -50.62 3:55:15. ! 45.6 199.4 -31.5 7.9
57.45 -53.48 3:55:30. ! 44.8 195.2 -30.5 4.5
58.72 -56.50 3:55:46. ! 43.9 190.9 -29.3 1.1
59.98 -59.72 3:56: 2. ! 42.9 186.5 -28.0 357.5
61.25 -63.16 3:56:17. ! 41.8 182.0 -26.6 353.8
62.51 -66.89 3:56:33. ! 40.5 177.3 -25.1 349.8
63.77 -70.95 3:56:49. ! 39.1 172.3 -23.5 345.6
65.00 -75.41 3:57: 4. ! 37.5 167.0 -21.8 341.0
66.22 -80.37 3:57:20. ! 35.8 161.4 -19.9 336.0
67.39 -85.92 3:57:35. ! 33.9 155.2 -17.9 330.5
68.50 -92.22 3:57:51. ! 31.8 148.4 -15.7 324.3
69.52 -99.45 3:58: 7. ! 29.5 140.9 -13.3 317.2
70.39 -107.81 3:58:22. ! 27.0 132.3 -10.6 309.2
71.03 -117.59 3:58:38. ! 24.0 122.4 -7.6 299.8
71.33 -129.13 3:58:53. ! 20.6 111.0 -4.1 288.8
71.04 -142.96 3:59: 9. ! 16.4 97.5 .2 275.7
69.60 -160.62 3:59:25. ! 10.5 80.6 6.1 259.2
-------------------------------------------------------------------------
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
!!! Preliminary update !!!
IOTA/IOTA-ES occultation update for
(1015) Christa / HIP 57721 event on 1999, March 25/26
visible from Algeria and Morocco, maybe also south Portugal and SW Spain
Summary
On the night March 25/26, 1999 will be occulted 8.5 mag star by a 101km
asteroid (1015) Christa. This update is based on USNO/Flagstaff astrometry
for asteroid and Hipparcos star position. The target star should be easy to
locate as it is only 1.6 degrees south of bright 2.1 mag beta Leo (Denebola).
The calculation shows path significantly shifted to south-west by about 7 path
widths and time about 1 minutes earlier compared to the
Goffin's nominal prediction.
The event at one glimpse:
* date and approx. UT time of event: March, 26, 1999 @ 03:51 UT
* magnitude of target star: 8.5
* magnitude drop [mag]: 5.5
* estimated maximum duration [s]: 7.4
* path description: Path runs over Algeria ~03:49 UT and Morocco ~03:50 UT.
South Portugal and SE Spain ~03:51 UT is about 1-2 path widths NE of this
updated path and this is still within the expected errors.
The occultation path:
* approximate width [km]: 140
* uncertainty [path widths]: 2
* 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 99820 = PPM 128595 = HIP 57721 = GSC 0870.0612
* constellation: Leo
* J2000 position [h,m,s; o,',"]: 11h 50m 14.493s; +13o 00' 49.23"
* position source: Hipparcos
* estimated accuracy ["]: 0.01" (0.01", 0.01")
* Johnson V mag [mag]: 8.48
* B-V [mag]: +0.23
* remarks: Target star is 1.6 degrees south of bright 2.1 mag beta Leo
(Denebola) so it should be easily located.
Data for the minor planet:
* general information:
mumber, name: (1015) Christa
approx. diameter [km]: 101
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 14 USNO
number of rejected observations: 0
time covered by the observations: 1998 03 10 - 1999 03 14
rms residuals ["] (RA,DE): 0.15", 0.13"
estimated positional accuracy at epoch of event ["]: 0.11"
remarks: Slightly larger RMS than usual, but I've decided to keep all
positions in the solution.
Data for the event:
* UT date and time of least geocentric approach: 03:53:42 UT
* approx. V mag of minor planet at event [mag]: 14.0
* geocentric parallax of minor planet ["]: 3.631
* magnitude drop [mag]: 5.5
* estimated maximum duration [s]: 7.4
* apparent motion of minor planet ["/h]: 27.91
* angular distance to moon, phase of moon [deg,%]: 57, 68%
* remarks:
Calculator(s): Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
+ 13 00 00 + 23 38 12 3 48 35 18 -19
+ 11 00 00 + 24 29 54 3 48 42 20 -20
+ 9 00 00 + 25 23 44 3 48 50 22 -22
+ 7 00 00 + 26 19 35 3 48 59 24 -23
+ 5 00 00 + 27 17 25 3 49 08 25 -25
+ 3 00 00 + 28 17 05 3 49 18 27 -26
+ 1 00 00 + 29 18 31 3 49 29 29 -27
- 1 00 00 + 30 21 36 3 49 40 31 -29
- 3 00 00 + 31 26 12 3 49 52 32 -30
- 5 00 00 + 32 32 13 3 50 04 34 -31
- 7 00 00 + 33 39 29 3 50 17 35 -32
- 9 00 00 + 34 47 52 3 50 30 37 -33
- 11 00 00 + 35 57 13 3 50 44 38 -33
- 13 00 00 + 37 07 23 3 50 57 39 -34
- 15 00 00 + 38 18 12 3 51 11 40 -35
- 17 00 00 + 39 29 29 3 51 26 41 -35
- 19 00 00 + 40 41 05 3 51 40 42 -35
- 21 00 00 + 41 52 48 3 51 55 43 -36
- 23 00 00 + 43 04 28 3 52 09 44 -36
- 25 00 00 + 44 15 54 3 52 24 45 -36
- 27 00 00 + 45 26 54 3 52 38 45 -36
- 29 00 00 + 46 37 20 3 52 53 45 -36
- 31 00 00 + 47 47 00 3 53 07 46 -35
- 33 00 00 + 48 55 44 3 53 21 46 -35
- 35 00 00 + 50 03 23 3 53 35 46 -35
- 37 00 00 + 51 09 48 3 53 48 46 -34
- 39 00 00 + 52 14 50 3 54 02 46 -34
----------------------------------------------------------------------------
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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