Update for (56) Melete - February 23/24, 2002
Update computed by Jan Manek; issued 17 Feb 2002 14:50:00 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(56) Melete / TYC 0797-00215-1 on February 23/24, 2002
visible from SW Italy, NE Sicily, Corse, France from SE to NW,
SW England and Ireland
Summary
In the night of February 23/24, 2002 a 10.7 mag star TYC 0797-00215-1
will be occulted by a 117 km asteroid (56) Melete. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and UCAC star position.
The updated path shows ~3 path width north shift with time ~0.3 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs over SW Italy and NE Sicily ~01:46.7 UT, NE Sarde ~01:47.3 UT, Corse ~01:47.5 UT,
France from SE to NW with Marseille and Nice in path ~01:47.7 UT, Limoges and Clermont-Ferrand ~01:48.2 UT,
Tours and Nantes ~01:48.5 UT. Just north of limit is Lyon, Grenoble and Orleans, just south of limit is Brest.
Cornwall in SW England ~01:49.1 UT and Ireland ~01:49.6 UT follow.
Much larger area is covered taking uncertainty into consideration.
Please check the path chart for details.
3 sigma uncertainty is 0.85 path width only, making it very interesting event for France observers with
many Audine cameras capable of drift scanning.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: February 24, 2002 @ 01:48 UT (Euro)
* magnitude of target star: 10.7
* magnitude drop [mag]: 2.5
* estimated maximum duration [s]: 9.0
* path description: given above
* Goffin's original chart reference: A02_0209
The occultation path:
* approximate ground width [km]: 215
* uncertainty [path widths]: 0.85
* uncertainty in time [s]: 10
* 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 0797-00215-1
* constellation: Cancer
* J2000 position [h,m,s; o,',"]: 08h 34m 52.0294s; +08o 52' 40.447"
* position source: UCAC combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.01" (0.010", 0.005")
* V mag [mag]: 10.71
* B-V [mag]: +0.65
* remarks:
Recent UCAC position was provided by Marion and Norbert Zacharias.
Target star is in southern Cancer, just above head of Hydra, about 4.5 degrees east of
3.5 mag beta Cancri = SAO 116569 or 3.2 degrees north of 4.1 mag delta Hydrae = SAO 116965.
Target star is 5' SE of 8.8 mag star SAO 116901.
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: (56) Melete
approx. diameter [km]: 117
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 82 USNO, 10 TMO
number of rejected observations: 11 USNO, 1 TMO
time covered by the observations: 1998 02 24 - 2002 02 12
rms residuals ["] (RA,DE): 0.06", 0.06"
estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 01:49.9 UT
* approx. V mag of minor planet at event [mag]: 13.1
* geocentric parallax of minor planet ["]: 3.912
* magnitude drop [mag]: 2.5
* estimated maximum duration [s]: 9.0
* apparent motion of minor planet ["/h]: 28.78
* angular distance to moon, phase of moon [deg,%]: 23, 85%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Latitude Latitude
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 ' "
35 0 0 30 31 53 1 45 30 8 -32 31 32 20 29 33 3
34 0 0 30 48 28 1 45 32 8 -33 31 49 11 29 49 23
33 0 0 31 5 49 1 45 34 9 -34 32 6 50 30 6 29
32 0 0 31 23 57 1 45 36 10 -35 32 25 16 30 24 20
31 0 0 31 42 52 1 45 39 11 -35 32 44 29 30 42 57
30 0 0 32 2 32 1 45 42 12 -36 33 4 30 31 2 19
29 0 0 32 22 58 1 45 45 13 -37 33 25 17 31 22 25
28 0 0 32 44 9 1 45 48 14 -38 33 46 51 31 43 17
27 0 0 33 6 6 1 45 51 14 -38 34 9 11 32 4 52
26 0 0 33 28 48 1 45 55 15 -39 34 32 17 32 27 12
25 0 0 33 52 15 1 45 59 16 -40 34 56 9 32 50 16
24 0 0 34 16 26 1 46 3 17 -40 35 20 46 33 14 3
23 0 0 34 41 21 1 46 7 18 -41 35 46 9 33 38 33
22 0 0 35 7 1 1 46 11 18 -42 36 12 17 34 3 47
21 0 0 35 33 23 1 46 16 19 -42 36 39 9 34 29 42
20 0 0 36 0 29 1 46 20 20 -43 37 6 46 34 56 20
19 0 0 36 28 18 1 46 25 21 -43 37 35 7 35 23 40
18 0 0 36 56 49 1 46 31 22 -44 38 4 12 35 51 41
17 0 0 37 26 2 1 46 36 22 -44 38 33 59 36 20 22
16 0 0 37 55 56 1 46 41 23 -45 39 4 30 36 49 44
15 0 0 38 26 31 1 46 47 24 -45 39 35 42 37 19 46
14 0 0 38 57 47 1 46 53 24 -46 40 7 37 37 50 27
13 0 0 39 29 42 1 46 59 25 -46 40 40 12 38 21 46
12 0 0 40 2 17 1 47 5 26 -46 41 13 28 38 53 44
11 0 0 40 35 30 1 47 11 26 -47 41 47 25 39 26 19
10 0 0 41 9 22 1 47 18 27 -47 42 22 0 39 59 31
9 0 0 41 43 50 1 47 24 27 -47 42 57 15 40 33 19
8 0 0 42 18 55 1 47 31 28 -47 43 33 7 41 7 41
7 0 0 42 54 35 1 47 38 29 -47 44 9 37 41 42 39
6 0 0 43 30 51 1 47 45 29 -47 44 46 43 42 18 9
5 0 0 44 7 40 1 47 52 30 -48 45 24 24 42 54 13
4 0 0 44 45 2 1 47 59 30 -48 46 2 40 43 30 47
3 0 0 45 22 56 1 48 6 30 -48 46 41 30 44 7 53
2 0 0 46 1 20 1 48 14 31 -47 47 20 52 44 45 28
1 0 0 46 40 15 1 48 21 31 -47 48 0 45 45 23 31
0 0 0 47 19 38 1 48 29 32 -47 48 41 9 46 2 1
- 1 0 0 47 59 28 1 48 36 32 -47 49 22 2 46 40 58
- 2 0 0 48 39 44 1 48 44 32 -47 50 3 22 47 20 18
- 3 0 0 49 20 24 1 48 51 33 -47 50 45 9 48 0 2
- 4 0 0 50 1 27 1 48 59 33 -46 51 27 20 48 40 8
- 5 0 0 50 42 52 1 49 7 33 -46 52 9 55 49 20 34
- 6 0 0 51 24 37 1 49 15 33 -46 52 52 51 50 1 19
- 7 0 0 52 6 39 1 49 23 33 -45 53 36 7 50 42 20
- 8 0 0 52 48 58 1 49 30 33 -45 54 19 41 51 23 37
- 9 0 0 53 31 32 1 49 38 33 -44 55 3 30 52 5 7
- 10 0 0 54 14 17 1 49 46 33 -44 55 47 34 52 46 48
- 11 0 0 54 57 13 1 49 54 33 -43 56 31 49 53 28 39
- 12 0 0 55 40 18 1 50 2 33 -43 57 16 14 54 10 37
- 13 0 0 56 23 28 1 50 9 33 -42 58 0 46 54 52 41
- 14 0 0 57 6 41 1 50 17 33 -42 58 45 22 55 34 48
- 15 0 0 57 49 56 1 50 24 33 -41 59 30 1 56 16 56
- 16 0 0 58 33 10 1 50 32 33 -41 60 14 39 56 59 2
........................... 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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