Update for (423) Diotima - January 7, 2000
Update computed by Jan Manek; issued 05 Jan 2000 15:05:07 +0100 (CET)
Update computed by Martin Federspiel; issued 4 Jan 2000 23:55:21 +100 (CET)
Martin Federspiel's update
IOTA/IOTA-ES occultation update for
(423) Diotima/GSC 2470 00150 event on 2000 Jan 7
visible from Asia, northern Italy, France
Summary
On the evening of 2000 Jan 7 the 220 km large asteroid (423) Diotima
occults the 11.5 mag star GSC 2470 00150 for observers in Asia and
Europe (northern Italy, southern Switzerland, France). This is a
favourable event for larger telescopes which are able to monitor a
11 mag star, because the star is high in the sky and the path is
known with high precision.
There is no significant shift of the path compared to compared to the
nominal prediction of E. Goffin, but a time shift of +0.5m (times later than predicted
by Goffin). Goffin's nominal prediction file has number b00_0118.ps.gz.
The event at one glimpse:
* date and approx. UT time of event: 2000 Jan 07 @ 21h 40m UT
* magnitude of target star: V=11.5
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 16
* rough path description: Indonesia, India, Pakistan, Afghanistan,
northern Turkey, Black Sea, Romania, former Yugoslavia, northernmost
Italy, southernmost Switzerland, France (west of Geneva)
The occultation path:
* approximate widths [km]: 220
* more detailed path description: Indonesia, India, Pakistan, Afghanistan,
northern Turkey, Black Sea, Romania, former Yugoslavia, northernmost
Italy, southernmost Switzerland, France (west of Geneva);
see also attached map
* uncertainty [path widths]: 0.7
* map: attached
* remarks: path exactly as Goffin's, times 0.5m later than Goffin's
Data for the target star:
* name: GSC 2470 00150
* constellation: Cancer (northwestern part)
* J2000 position [h,m,s; °,',"]: RA 8 16 14.764 DE +31 40 14.81
* position source: single USNO measurement
* estimated accuracy ["]: 0.06 (statement Ron Stone)
* V mag [mag]: 11.50
* remarks:
Data for the minor planet:
* general information:
mumber, name: (423) Diotima
approx. diameter [km]: 217
* orbital information
orbit source: calculation Federspiel
source of used astrometry: CAMC, Bordeaux, USNO, TMO
number of used observations: 272
number of rejected observations: several
time covered by the observations: 1985 - 1999 Dec 23
rms residuals ["] (RA,DE): 0.18",0.20"
estimated positional accuracy at epoch of event ["]: 0.08
remarks:
Data for the event:
* UT date and time of least geocentric approach: 2000 Jan 07 @ 21h 38m 13s UT
* least geocentric distance ["]: 0.36
* uncertainty in time [s]: 12
* approx. V mag of minor planet at event [mag]: 11.9
* geocentric parallax of minor planet ["]: 3.94
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 16
* apparent motion of minor planet ["/h]: 30.7"/h
* angular distance to moon, phase of moon [°,%]: 168°, 1%
* remarks:
Calculator(s): Martin Federspiel
Path coordinates:
Lat. Long. hh:mm:ss UT StarAlt° StarAzi° SunAlt° SunAzi°
-8.86 119.10 21:30:52. ! 16.4 306.8 -5.5 113.7
-5.22 114.50 21:31: 7. ! 22.1 307.3 -11.1 114.0
-2.28 110.88 21:31:22. ! 26.7 307.5 -15.5 114.0
.29 107.79 21:31:38. ! 30.7 307.4 -19.3 113.7
2.60 105.03 21:31:53. ! 34.2 307.2 -22.7 113.2
4.72 102.50 21:32: 9. ! 37.5 306.9 -25.8 112.6
6.70 100.14 21:32:24. ! 40.5 306.5 -28.7 111.9
8.57 97.90 21:32:39. ! 43.3 306.0 -31.4 111.0
10.34 95.76 21:32:55. ! 46.0 305.4 -33.9 110.1
12.03 93.70 21:33:10. ! 48.6 304.7 -36.3 109.0
13.65 91.69 21:33:26. ! 51.1 304.0 -38.6 107.9
15.20 89.73 21:33:41. ! 53.5 303.2 -40.9 106.6
16.70 87.81 21:33:57. ! 55.8 302.2 -43.0 105.3
18.16 85.91 21:34:12. ! 58.0 301.2 -45.0 103.8
19.56 84.03 21:34:27. ! 60.2 300.1 -47.0 102.2
20.93 82.17 21:34:43. ! 62.4 298.8 -49.0 100.4
22.25 80.31 21:34:58. ! 64.5 297.3 -50.8 98.6
23.54 78.46 21:35:14. ! 66.5 295.7 -52.6 96.5
24.79 76.60 21:35:29. ! 68.5 293.9 -54.4 94.3
26.01 74.74 21:35:45. ! 70.5 291.8 -56.1 91.9
27.20 72.86 21:35:60. ! 72.4 289.4 -57.7 89.3
28.36 70.98 21:36:15. ! 74.3 286.5 -59.3 86.5
29.48 69.07 21:36:31. ! 76.2 283.1 -60.8 83.4
30.58 67.14 21:36:46. ! 78.0 278.8 -62.2 80.0
31.65 65.18 21:37: 2. ! 79.7 273.3 -63.6 76.4
32.69 63.20 21:37:17. ! 81.3 266.0 -64.9 72.3
33.70 61.18 21:37:32. ! 82.8 256.0 -66.1 68.0
34.68 59.13 21:37:48. ! 83.9 241.9 -67.2 63.2
35.64 57.03 21:38: 3. ! 84.7 222.9 -68.1 58.1
36.56 54.90 21:38:19. ! 84.8 200.9 -69.0 52.5
37.45 52.71 21:38:34. ! 84.2 180.5 -69.7 46.5
38.30 50.48 21:38:50. ! 83.1 164.8 -70.2 40.1
39.13 48.19 21:39: 5. ! 81.8 153.4 -70.6 33.4
39.92 45.85 21:39:20. ! 80.2 145.0 -70.8 26.5
40.67 43.45 21:39:36. ! 78.5 138.5 -70.8 19.4
41.39 40.98 21:39:51. ! 76.7 133.3 -70.6 12.3
42.06 38.44 21:40: 7. ! 74.9 128.9 -70.2 5.2
42.69 35.84 21:40:22. ! 73.0 125.0 -69.7 358.3
43.28 33.16 21:40:38. ! 71.1 121.5 -68.9 351.6
43.81 30.40 21:40:53. ! 69.1 118.2 -68.0 345.2
44.30 27.56 21:41: 8. ! 67.1 115.1 -66.9 339.1
44.73 24.64 21:41:24. ! 65.1 112.2 -65.7 333.2
45.09 21.63 21:41:39. ! 63.0 109.3 -64.4 327.6
45.40 18.53 21:41:55. ! 60.9 106.5 -62.9 322.3
45.63 15.34 21:42:10. ! 58.7 103.6 -61.3 317.2
45.79 12.06 21:42:25. ! 56.5 100.8 -59.6 312.3
45.87 8.67 21:42:41. ! 54.2 98.0 -57.8 307.6
45.86 5.19 21:42:56. ! 51.8 95.2 -55.8 303.0
45.75 1.59 21:43:12. ! 49.4 92.3 -53.8 298.5
45.53 -2.12 21:43:27. ! 46.8 89.4 -51.6 294.2
45.19 -5.95 21:43:43. ! 44.2 86.5 -49.2 289.9
44.71 -9.92 21:43:58. ! 41.4 83.5 -46.8 285.7
44.07 -14.05 21:44:13. ! 38.4 80.5 -44.1 281.6
43.25 -18.36 21:44:29. ! 35.2 77.4 -41.2 277.4
42.21 -22.90 21:44:44. ! 31.8 74.2 -38.0 273.3
40.87 -27.75 21:44:60. ! 28.0 70.9 -34.5 269.1
39.14 -33.07 21:45:15. ! 23.6 67.4 -30.3 264.7
36.76 -39.19 21:45:30. ! 18.3 63.6 -25.3 260.1
32.92 -47.33 21:45:46. ! 10.7 59.0 -18.0 254.5
-------------------------------------------------------------------------
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
(423) Diotima / GSC 2470.0150 event on January 7, 2000
visible from Asia, Romania, N of frm.Yugoslavia,
N Italy, Switzerland and south France
Summary
In the night January 7/8, 1999 a faint 11.4 mag star GSC 2470.0150 will be
occulted by a large 217 km asteroid (423) Diotima. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and USNO/Flagstaff star
position.
The updated path shows no shift with time ~0.3 minutes later compared to
Goffin's nominal prediction.
The path of this occultation runs over several asian states (see map) and
after crossing Balck Sea the path enters Romania and north Bulgaria at
~21:41 UT, very south Hungary, north of former Yugoslavia, north Italy
~21:42 UT, Switzerland and south France.
The path uncertainity is only 1 path width, within this error is also
whole Bulgary, Hungary, Austria, Italy down to Roma, southern Germany,
whole Switzerland, all France south of Paris and NW Spain.
Be avare that magnitude drop should be only about 1.0 magnitude - this
is close to the limit of visual observations, but any other technique
as video recording, drift scan observation or IOTA occultation camera
should provide very good results.
The star is rather faint having 11.4 mag (larger telesopes !) and it
is still somewhat uncertain so the magnitude drop may be smaller (or
larger) than given 1.0 mag.
The event at one glimpse:
* date and approx. UT time of event: January 7, 2000 @ 21:42 UT (Euro)
* magnitude of target star: 11.4
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 15.7
* path description: given above
* Goffin's original chart reference: B00_0118.PS.GZ
The occultation path:
* approximate ground width [km]: 220
* uncertainty [path widths]: 1.0
* 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: GSC 2470.0150
* constellation: Cancer
* J2000 position [h,m,s; o,',"]: 08h 16m 14.766s; +31o 40' 14.71"
* position source: USNO/Flagstaff
* estimated accuracy ["]: 0.06"
* V mag [mag]: 11.4
* B-V [mag]: +0.??
* remarks: Only single position by Ron Stone is available with estimated
accuracy given above. Magnitude given in GSC in more closely a V
magnitude than B magnitude. Edwin Goffin supposed GSC magnitude is B
mag and therefore there is the difference of magnitude drop from his
nominal prediction.
Target star is in NW Cancer, about 7.6 degrees NE of 1.2 mag star beta
Gem = Pollux or 8.9 degrees east of 2.0 mag star alpha Gem = Castor
(almost exactly on the same declination line, t.s. is only 13' south).
There is 9.6 mag star SAO 60684 only 9.3' NW of target star.
Data for the minor planet:
* general information:
number, name: (423) Diotima
approx. diameter [km]: 217
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 47 USNO, 8 TMO
number of rejected observations: 6 USNO
time covered by the observations: 1998 08 28 - 1999 12 23
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: 21:37:57 UT
* approx. V mag of minor planet at event [mag]: 11.9
* geocentric parallax of minor planet ["]: 3.945
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 15.7
* apparent motion of minor planet ["/h]: 30.71
* angular distance to moon, phase of moon [deg,%]: 168, 1%
* remarks:
Close finding chart:
* occulted star is in center - labeled with cross
* field is 1.5x1.5 degrees
* labeled stars have indicated SAO numbers
* interrupted circles are double stars according to WDS96
* asteroid position is indicated for midnight so it is AFTER the occultation
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
........ shortened ..........................
+114 00 00 - 5 19 23 21 30 52 23 -12
+112 00 00 - 3 41 11 21 31 00 25 -14
+110 00 00 - 2 01 47 21 31 09 28 -17
+108 00 00 - 0 21 27 21 31 19 30 -19
+106 00 00 + 1 19 31 21 31 30 33 -21
+104 00 00 + 3 00 52 21 31 42 35 -24
+102 00 00 + 4 42 17 21 31 54 38 -26
+100 00 00 + 6 23 31 21 32 07 40 -29
+ 98 00 00 + 8 04 15 21 32 21 43 -31
+ 96 00 00 + 9 44 15 21 32 35 45 -34
+ 94 00 00 + 11 23 14 21 32 50 48 -36
+ 92 00 00 + 13 00 57 21 33 05 50 -38
+ 90 00 00 + 14 37 11 21 33 21 53 -40
+ 88 00 00 + 16 11 42 21 33 37 55 -43
+ 86 00 00 + 17 44 19 21 33 53 58 -45
+ 84 00 00 + 19 14 51 21 34 10 60 -47
+ 82 00 00 + 20 43 08 21 34 26 62 -49
+ 80 00 00 + 22 09 04 21 34 43 65 -51
+ 78 00 00 + 23 32 30 21 35 00 67 -53
+ 76 00 00 + 24 53 22 21 35 16 69 -55
+ 74 00 00 + 26 11 34 21 35 33 71 -57
+ 72 00 00 + 27 27 04 21 35 49 73 -58
+ 70 00 00 + 28 39 49 21 36 05 75 -60
+ 68 00 00 + 29 49 47 21 36 22 77 -62
+ 66 00 00 + 30 56 58 21 36 37 79 -63
+ 64 00 00 + 32 01 21 21 36 53 80 -64
+ 62 00 00 + 33 02 58 21 37 09 82 -66
+ 60 00 00 + 34 01 49 21 37 24 83 -67
+ 58 00 00 + 34 57 57 21 37 39 84 -68
+ 56 00 00 + 35 51 22 21 37 53 84 -69
+ 54 00 00 + 36 42 09 21 38 08 84 -69
+ 52 00 00 + 37 30 18 21 38 22 84 -70
+ 50 00 00 + 38 15 54 21 38 36 83 -70
+ 48 00 00 + 38 58 59 21 38 49 81 -71
+ 46 00 00 + 39 39 36 21 39 02 80 -71
+ 44 00 00 + 40 17 48 21 39 15 79 -71
+ 42 00 00 + 40 53 38 21 39 28 77 -71
+ 40 00 00 + 41 27 08 21 39 40 76 -71
+ 38 00 00 + 41 58 23 21 39 52 74 -70
+ 36 00 00 + 42 27 25 21 40 04 73 -70
+ 34 00 00 + 42 54 17 21 40 16 72 -69
+ 32 00 00 + 43 19 00 21 40 27 70 -69
+ 30 00 00 + 43 41 38 21 40 38 69 -68
+ 28 00 00 + 44 02 13 21 40 49 67 -67
+ 26 00 00 + 44 20 46 21 41 00 66 -66
+ 24 00 00 + 44 37 21 21 41 10 65 -66
+ 22 00 00 + 44 51 58 21 41 21 63 -65
+ 20 00 00 + 45 04 39 21 41 31 62 -64
+ 18 00 00 + 45 15 25 21 41 41 60 -63
+ 16 00 00 + 45 24 18 21 41 50 59 -62
+ 14 00 00 + 45 31 18 21 42 00 58 -61
+ 12 00 00 + 45 36 27 21 42 09 56 -60
+ 10 00 00 + 45 39 44 21 42 19 55 -59
+ 8 00 00 + 45 41 10 21 42 28 54 -57
+ 6 00 00 + 45 40 44 21 42 36 52 -56
+ 4 00 00 + 45 38 28 21 42 45 51 -55
+ 2 00 00 + 45 34 20 21 42 54 49 -54
+ 0 00 00 + 45 28 20 21 43 02 48 -53
- 2 00 00 + 45 20 26 21 43 11 47 -52
- 4 00 00 + 45 10 39 21 43 19 45 -50
- 6 00 00 + 44 58 56 21 43 27 44 -49
- 8 00 00 + 44 45 17 21 43 35 43 -48
- 10 00 00 + 44 29 39 21 43 42 41 -47
- 12 00 00 + 44 12 00 21 43 50 40 -45
- 14 00 00 + 43 52 19 21 43 57 38 -44
- 16 00 00 + 43 30 33 21 44 05 37 -43
- 18 00 00 + 43 06 39 21 44 12 35 -41
- 20 00 00 + 42 40 35 21 44 19 34 -40
........ 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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