Update for (618) Elfriede - June 19/20, 2002
Update computed by Jan Manek; issued 14 Jun 2002 23:00:00 +0200 (CEST)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(618) Elfriede / TYC 6369-00957-1 on June 19/20 2002
visible from NE Ireland, W England and Scotland, W France and NE Spain
Summary
In night of June 19/20, 2002 a 11.2 mag star TYC 6369-00957-1
will be occulted by a 124 km asteroid (618) Elfriede. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and UCAC1 star position.
The updated path shows ~1.5 path width easth shift with time ~2.1 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs under twilight over west coast of Scotland ~2:18.3 UT, NE Ireland
~2:18.4 UT, southwest England ~2:18.5 UT. Follows western part of France where Rennes and
Nantes are close to central line shortly before 2:19.0 UT, Bordeaux on central line ~2:19.2 UT,
Pic du Midi ~2:19.5 UT and finally area west of Barcelona around 2:19.6 UT. Later path runs
over west Africa.
Please check the path chart for details.
Path location is rather well defined and runs over areas with many observers.
Duration is almost 20 seconds with distinct magnitude drop - good occasion.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: June 20, 2002 @ 02:19 UT (Euro)
* magnitude of target star: 11.2
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 17.8
* path description: given above
* Goffin's original chart reference: A02_0637
The occultation path:
* approximate ground width [km]: 130
* uncertainty [path widths]: 0.68
* uncertainty in time [s]: 15
* map: below
* remarks: Path uncertainties are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: TYC 6369-00957-1
* constellation: Capricornus
* J2000 position [h,m,s; o,',"]: 21h 31m 06.5578s; -19o 56' 04.341"
* position source: UCAC1
* estimated accuracy ["]: 0.01" (0.012", 0.006")
* V mag [mag]: 11.23
* B-V [mag]: +0.73
* remarks:
Target star is in mid-east Capricornus, about 1.5 degrees west of 4.5 mag star epsilon
Capricorni = SAO 164520.
Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields
the 'non-stars' are often real stars or blends of close pairs. Be careful about this.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 13.0
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (618) Elfriede
approx. diameter [km]: 124
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 89 USNO, 5 TMO
number of rejected observations: 7 USNO
time covered by the observations: 1998 10 14 - 2002 06 05
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.04", 0.04"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 02:32.9 UT
* approx. V mag of minor planet at event [mag]: 15.0
* geocentric parallax of minor planet ["]: 3.958
* magnitude drop [mag]: 2.2
* estimated maximum duration [s]: 17.8
* apparent motion of minor planet ["/h]: 15.52
* angular distance to moon, phase of moon [deg,%]: 113, 73%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2002 Jun 20
618 Elfriede
2h 32.9m UT
69-00957-1 11.2 21 31 6.558-19 56 4.34TYC 6369-00957-1
13.2 124 17.8 2.222 0.044 -15.52
16.411 -19.930 -217.86 23.43
2.5484 -.21066 -.00855 0.16270 -3.91909 -0.00414 -0.00106
2000 328.3576592002 615.00000228.646561111.26083317.015566 0.079962013.188794782.933812358.265 0.15
RATE 1.7308690 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Longitude Longitude
Center Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
- 9 54 4 60 0 0 2 18 6 7 -4 - 11 11 24 - 8 37 42
- 8 56 8 59 0 0 2 18 8 8 -5 - 10 10 29 - 7 42 39
- 8 2 33 58 0 0 2 18 11 9 -6 - 9 14 11 - 6 51 41
- 7 12 51 57 0 0 2 18 13 10 -7 - 8 22 0 - 6 4 23
- 6 26 38 56 0 0 2 18 17 11 -7 - 7 33 31 - 5 20 23
- 5 43 35 55 0 0 2 18 20 12 -8 - 6 48 23 - 4 39 22
- 5 3 25 54 0 0 2 18 24 13 -9 - 6 6 17 - 4 1 4
- 4 25 50 53 0 0 2 18 28 14 -9 - 5 26 56 - 3 25 14
- 3 50 39 52 0 0 2 18 32 15 -10 - 4 50 5 - 2 51 40
- 3 17 40 51 0 0 2 18 37 16 -11 - 4 15 33 - 2 20 11
- 2 46 41 50 0 0 2 18 42 17 -12 - 3 43 9 - 1 50 37
- 2 17 34 49 0 0 2 18 47 18 -12 - 3 12 41 - 1 22 49
- 1 50 11 48 0 0 2 18 53 19 -13 - 2 44 2 - 0 56 39
- 1 24 23 47 0 0 2 18 59 21 -14 - 2 17 3 - 0 32 1
- 1 0 4 46 0 0 2 19 5 22 -14 - 1 51 38 - 0 8 47
- 0 37 8 45 0 0 2 19 11 23 -15 - 1 27 39 0 13 7
- 0 15 29 44 0 0 2 19 18 24 -16 - 1 5 2 0 33 48
0 4 56 43 0 0 2 19 25 25 -16 - 0 43 41 0 53 19
0 24 14 42 0 0 2 19 32 26 -17 - 0 23 31 1 11 45
0 42 28 41 0 0 2 19 39 27 -18 - 0 4 27 1 29 10
0 59 42 40 0 0 2 19 47 28 -19 0 13 33 1 45 38
1 15 59 39 0 0 2 19 55 29 -19 0 30 34 2 1 11
1 31 22 38 0 0 2 20 3 30 -20 0 46 39 2 15 53
1 45 54 37 0 0 2 20 11 31 -21 1 1 51 2 29 46
1 59 39 36 0 0 2 20 20 32 -21 1 16 14 2 42 54
2 12 38 35 0 0 2 20 29 33 -22 1 29 48 2 55 17
2 24 53 34 0 0 2 20 38 34 -23 1 42 37 3 6 60
2 36 28 33 0 0 2 20 47 35 -23 1 54 44 3 18 2
2 47 23 32 0 0 2 20 57 36 -24 2 6 9 3 28 27
2 57 40 31 0 0 2 21 7 37 -25 2 16 56 3 38 16
........................... shortened .............................
----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory Private :
Petrin 205 Werichova 950
118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_|
Czech Republic Czech Republic / \
Internet : jan.manek@worldonline.cz |-O-O-|
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