Update for (81) Terpsichore - January 13/14, 2002
Update computed by Jan Manek; issued 10 Jan 2002 01:00:00 +0100 (CET)
Update computed by Jan Manek; issued 11 Jan 2002 01:00:00 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(81) Terpsichore / TYC 6156-00764-1 on January 13/14, 2002
visible from S Ireland, Cornwall, France from west to SE
Summary
In the morning of night January 13/14, 2002 a faint 11.2 mag star TYC 6156-00764-1
will be occulted by a 124 km asteroid (81) Terpsichore. This update is based on
USNO/Flagstaff, TMO and Astdys historic astrometry for the asteroid and UCAC1 star
position.
The updated path shows ~0.4 path width north shift with no time shift
compared to
Edwin Goffin's nominal prediction.
Updated path runs over south Ireland 6:18.6 UT, Cornwall ~6:19.0 UT,
France from west to SE ~6:19.4 UT. Within expected error bar is also NE Spain
with Barcelona, whole Ireland, SE England and most of France. Recent accurate
astrometry helped to refine the path and reduce the uncertainty.
Please check the path chart for details.
Good luck !
The event at one glimpse:
* date and approx. UT time of event: January 14, 2002 @ 06:19 UT (Euro)
* magnitude of target star: 11.2
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 5.6
* path description: given above
* Goffin's original chart reference: A02_0113
The occultation path:
* approximate ground width [km]: 185
* uncertainty [path widths]: 2.3
* uncertainty in time [s]: 15
* map: below
* remarks: Path uncertainities are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: TYC 6156-00764-1
* constellation: Libra
* J2000 position [h,m,s; o,',"]: 14h 27m 00.8556s; -17o 33' 03.560"
* position source: UCAC1
* estimated accuracy ["]: 0.02" (0.01", 0.01")
* V mag [mag]: 11.23
* B-V [mag]: +0.79
* remarks:
Target star is in west Libra, 6 degrees west of 2.8 mag star alpha2 Librae =
= SAO 158840 or 6' north of 8.1 mag star SAO 158568.
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
Data for the minor planet:
* general information:
number, name: (81) Terpsichore
approx. diameter [km]: 124
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen),
Gnosca (Stefano Sposetti)
number of used observations: 83 USNO, 26 TMO, 9(2)
number of rejected observations: 12 USNO
time covered by the observations: 1998 04 24 - 2002 01 10
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.10", 0.10"
remarks: The only available astrometry from recent opposition is from
Stefano Sposetti. Two means were computed from his 9 positions.
Data for the event:
* UT date and time of least geocentric approach: 06:21.6 UT
* approx. V mag of minor planet at event [mag]: 14.7
* geocentric parallax of minor planet ["]: 2.518
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 5.6
* apparent motion of minor planet ["/h]: 31.62
* angular distance to moon, phase of moon [deg,%]: 82, 1%
* remarks:
Calculator(s): Jan Manek
Centerline path and limit line coordinates:
Latitude Latitude
Centre Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
- 19 0 0 59 0 19 6 18 34 10 -27 57 41 8 60 22 57
- 18 0 0 58 20 36 6 18 35 11 -26 57 1 32 59 43 4
- 17 0 0 57 40 14 6 18 36 12 -26 56 21 20 59 2 31
- 16 0 0 56 59 16 6 18 38 13 -25 55 40 33 58 21 20
- 15 0 0 56 17 43 6 18 39 14 -24 54 59 15 57 39 32
- 14 0 0 55 35 39 6 18 41 15 -24 54 17 26 56 57 9
- 13 0 0 54 53 4 6 18 43 15 -23 53 35 8 56 14 14
- 12 0 0 54 10 1 6 18 45 16 -23 52 52 25 55 30 49
- 11 0 0 53 26 33 6 18 47 17 -22 52 9 17 54 46 57
- 10 0 0 52 42 41 6 18 49 18 -21 51 25 48 54 2 40
- 9 0 0 51 58 29 6 18 51 19 -21 50 42 0 53 18 0
- 8 0 0 51 13 58 6 18 53 20 -20 49 57 55 52 33 1
- 7 0 0 50 29 11 6 18 56 21 -19 49 13 35 51 47 44
- 6 0 0 49 44 12 6 18 59 22 -18 48 29 3 51 2 14
- 5 0 0 48 59 2 6 19 1 23 -17 47 44 22 50 16 31
- 4 0 0 48 13 44 6 19 4 23 -17 46 59 34 49 30 39
- 3 0 0 47 28 20 6 19 7 24 -16 46 14 41 48 44 42
- 2 0 0 46 42 54 6 19 11 25 -15 45 29 47 47 58 40
- 1 0 0 45 57 28 6 19 14 26 -14 44 44 52 47 12 38
0 0 0 45 12 4 6 19 17 27 -13 44 0 1 46 26 38
1 0 0 44 26 45 6 19 21 28 -12 43 15 15 45 40 42
2 0 0 43 41 33 6 19 25 29 -11 42 30 37 44 54 53
3 0 0 42 56 31 6 19 29 29 -10 41 46 8 44 9 13
4 0 0 42 11 41 6 19 33 30 -9 41 1 52 43 23 46
5 0 0 41 27 5 6 19 37 31 -8 40 17 51 42 38 33
6 0 0 40 42 46 6 19 41 32 -7 39 34 6 41 53 36
7 0 0 39 58 45 6 19 45 33 -6 38 50 39 41 8 58
8 0 0 39 15 6 6 19 49 33 -5 38 7 34 40 24 41
........................... 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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Jan Manek's update
IOTA/IOTA-ES occultation update for
(81) Terpsichore / TYC 6156-00764-1 on January 13/14, 2002
visible from S Ireland, Cornwall, France from west to SE
Summary
In the morning of night January 13/14, 2002 a faint 11.2 mag star TYC 6156-00764-1
will be occulted by a 124 km asteroid (81) Terpsichore. This update is based on
USNO/Flagstaff, TMO and Astdys historic astrometry for the asteroid and UCAC1 star
position.
The updated path shows ~0.5 path width north shift with time ~0.1 minutes earlier
compared to
Edwin Goffin's nominal prediction.
Updated path runs over south Ireland 6:18.6 UT, Cornwall ~6:18.8 UT,
France from west to SE ~6:19.3 UT. Within expected error bar is also NE Spain
with Barcelona, whole Ireland, SE England and most of France. Path uncertainties
are larger than I would like to have, but no recent accurate astrometry is available to refine the path.
Please check the path chart for details.
Good luck !
The event at one glimpse:
* date and approx. UT time of event: January 14, 2002 @ 06:19 UT (Euro)
* magnitude of target star: 11.2
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 5.6
* path description: given above
* Goffin's original chart reference: A02_0113
The occultation path:
* approximate ground width [km]: 185
* uncertainty [path widths]: 2.3
* uncertainty in time [s]: 15
* map: below
* remarks: Path uncertainities are given according to nominal star
position errors and expected asteroid positional accuracy.
Data for the target star:
* name: TYC 6156-00764-1
* constellation: Libra
* J2000 position [h,m,s; o,',"]: 14h 27m 00.8556s; -17o 33' 03.560"
* position source: UCAC1
* estimated accuracy ["]: 0.02" (0.01", 0.01")
* V mag [mag]: 11.23
* B-V [mag]: +0.79
* remarks:
Target star is in west Libra, 6 degrees west of 2.8 mag star alpha2 Librae =
= SAO 158840 or 6' north of 8.1 mag star SAO 158568.
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
Data for the minor planet:
* general information:
number, name: (81) Terpsichore
approx. diameter [km]: 124
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen),
Neodys
number of used observations: 83 USNO, 26 TMO
number of rejected observations: 12 USNO
time covered by the observations: 1972 03 09 - 2001 04 10
rms residuals ["] (RA,DE): 0.11", 0.11"
estimated positional accuracy at epoch of event ["]: 0.11", 0.11"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 06:21.5 UT
* approx. V mag of minor planet at event [mag]: 14.7
* geocentric parallax of minor planet ["]: 2.518
* magnitude drop [mag]: 3.5
* estimated maximum duration [s]: 5.6
* apparent motion of minor planet ["/h]: 31.62
* angular distance to moon, phase of moon [deg,%]: 82, 1%
* remarks:
Calculator(s): Jan Manek
Centerline path and limit line coordinates:
Latitude Latitude
Centre Altitude Path Limits
E. Longitude Latitude U.T. star sun Limit 1 Limit 2
........................... shortened .............................
o ' " o ' " h m s o o o ' " o ' "
- 19 0 0 59 21 30 6 18 27 10 -27 58 1 31 60 45 3
- 18 0 0 58 41 46 6 18 29 11 -26 57 21 54 60 5 10
- 17 0 0 58 1 22 6 18 30 12 -26 56 41 40 59 24 35
- 16 0 0 57 20 22 6 18 31 12 -25 56 0 52 58 43 21
- 15 0 0 56 38 47 6 18 33 13 -24 55 19 31 58 1 30
- 14 0 0 55 56 39 6 18 34 14 -24 54 37 40 57 19 3
- 13 0 0 55 14 1 6 18 36 15 -23 53 55 19 56 36 4
- 12 0 0 54 30 53 6 18 38 16 -23 53 12 32 55 52 34
- 11 0 0 53 47 20 6 18 40 17 -22 52 29 20 55 8 36
- 10 0 0 53 3 23 6 18 42 18 -21 51 45 46 54 24 13
- 9 0 0 52 19 5 6 18 44 19 -21 51 1 53 53 39 27
- 8 0 0 51 34 28 6 18 47 20 -20 50 17 42 52 54 20
- 7 0 0 50 49 35 6 18 49 20 -19 49 33 16 52 8 56
- 6 0 0 50 4 29 6 18 52 21 -18 48 48 39 51 23 17
- 5 0 0 49 19 11 6 18 54 22 -18 48 3 51 50 37 26
- 4 0 0 48 33 45 6 18 57 23 -17 47 18 56 49 51 26
- 3 0 0 47 48 14 6 19 0 24 -16 46 33 56 49 5 19
- 2 0 0 47 2 39 6 19 4 25 -15 45 48 54 48 19 9
- 1 0 0 46 17 5 6 19 7 26 -14 45 3 52 47 32 57
0 0 0 45 31 32 6 19 10 27 -13 44 18 53 46 46 47
1 0 0 44 46 4 6 19 14 27 -12 43 33 59 46 0 41
2 0 0 44 0 43 6 19 18 28 -11 42 49 12 45 14 42
3 0 0 43 15 32 6 19 21 29 -10 42 4 35 44 28 53
4 0 0 42 30 32 6 19 25 30 -10 41 20 11 43 43 15
5 0 0 41 45 47 6 19 29 31 -9 40 36 1 42 57 51
6 0 0 41 1 19 6 19 33 32 -8 39 52 7 42 12 44
7 0 0 40 17 9 6 19 38 32 -7 39 8 32 41 27 56
8 0 0 39 33 20 6 19 42 33 -6 38 25 18 40 43 29
........................... 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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