Update for (150) Nuwa - December 16/17, 1999
Update computed by Jan Manek; issued 13 Dec 1999 10:21:12 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(150) Nuwa / TAC +17 00745 event on December 16/17, 1999
visible from Russia, Finland, Sweden and Norway in Europe
and eastern Canada and middle USA
Summary
In the night December 16/17, 1999 a 11.2 mag star TAC +17 00745 will
be occulted by a 152 km asteroid (150) Nuwa. This update is based on
USNO/Flagstaff and TMO astrometry for the asteroid and USNO/Flagstaff star
position.
The updated path shows ~0.5" northern shift with time ~1.2 minutes earlier
compared to
Edwin Goffin's nominal prediction.
The path now runs over Russia at ~00:31-00:32 UT, S Finland ~00:33 UT,
middle Sweden and middle Norway ~00:33.5 UT and after that path grazes
southern Iceland ~00:36 UT and at ~00:38.5 also Greenland. Canada in
entered at ~00:40.5 UT north of Groswater Bay and path runs to SW over
Quebec provincia to Ontario. After crossing Lake Superior is in path
N Wisconsin and S-middle Minnesota with Duluth on n.limit ~00:45 UT and
Minneapolis in path. Later NW Iowa, SE of South Dakota and Nebraska at
~00:46 UT and Colorado with Denver ~00:47 UT. Also SE Utah and N Arizona
are in path buth here the twilight and star altitude may be a problem.
Ron Stone (USNO/Flagstaff) has kindly provided also updated position and
photometry of target star and Stefano Sposetti provided astrometry. I have
used Stone's position as it has less RMS error and was measured in ACT
reference frame, while Sposetti's was measured with GSC (unknown version)
reference frame.
Please note that the star has only 11.2 mag in V band which is 0.7 mag
fainter than the value in TAC catalogue. Brightness drop is therefore
now 1.5 magnitudes which is enough for visual observations.
The event at one glimpse:
* date and approx. UT time of event: December 17, 1999 @ 00:33 UT (Euro)
00:45 UT (N.Am.)
* magnitude of target star: 11.2
* magnitude drop [mag]: 1.5
* estimated maximum duration [s]: 18.3
* path description: given above
The occultation path:
* approximate ground width [km]: 210
* uncertainty [path widths]: 1
* uncertainty in time [s]: 20
* 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: TAC +17 00475 = GSC 1252.0406
* constellation: Taurus
* J2000 position [h,m,s; o,',"]: 03h 44m 04.492s; +17o 36' 06.82"
* position source: USNO/Flagstaff
* estimated accuracy ["]: 0.04" (0.03", 0.03")
* V mag [mag]: 11.24
* B-V [mag]: +0.9 ?
* remarks:
Target star is in western Taurus, about 6.5 degrees south of open
cluster M45. About 11' NE of target star is 9.2 mag star SAO 93574
and 28' SW of target is 7.1 mag star SAO 93561.
Data for the minor planet:
* general information:
number, name: (150) Nuwa
approx. diameter [km]: 157
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
number of used observations: 40 USNO, 3 TMO
number of rejected observations: 4 USNO
time covered by the observations: 1998 06 07 - 1999 12 10
rms residuals ["] (RA,DE): 0.06", 0.07"
estimated positional accuracy at epoch of event ["]: 0.07"
remarks: One recent position and 3 from previous opposition were
rejected.
Data for the event:
* UT date and time of least geocentric approach: 00:40:01 UT
* approx. V mag of minor planet at event [mag]: 12.4
* geocentric parallax of minor planet ["]: 4.688
* magnitude drop [mag]: 1.5
* estimated maximum duration [s]: 18.3
* apparent motion of minor planet ["/h]: 22.64
* angular distance to moon, phase of moon [deg,%]: 53, 59%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
........ shortened ..........................
+ 64 00 00 + 55 15 19 0 30 53 8 -29
+ 62 00 00 + 55 48 26 0 30 57 10 -30
+ 60 00 00 + 56 20 18 0 31 00 11 -31
+ 58 00 00 + 56 50 53 0 31 05 12 -32
+ 56 00 00 + 57 20 13 0 31 09 13 -33
+ 54 00 00 + 57 48 19 0 31 14 14 -34
+ 52 00 00 + 58 15 10 0 31 19 15 -35
+ 50 00 00 + 58 40 48 0 31 24 16 -36
+ 48 00 00 + 59 05 14 0 31 30 17 -37
+ 46 00 00 + 59 28 28 0 31 36 19 -37
+ 44 00 00 + 59 50 33 0 31 42 20 -38
+ 42 00 00 + 60 11 28 0 31 48 21 -39
+ 40 00 00 + 60 31 15 0 31 54 22 -40
+ 38 00 00 + 60 49 55 0 32 01 22 -41
+ 36 00 00 + 61 07 29 0 32 08 23 -41
+ 34 00 00 + 61 23 58 0 32 15 24 -42
+ 32 00 00 + 61 39 23 0 32 22 25 -43
+ 30 00 00 + 61 53 46 0 32 29 26 -43
+ 28 00 00 + 62 07 06 0 32 37 27 -44
+ 26 00 00 + 62 19 26 0 32 44 28 -44
+ 24 00 00 + 62 30 45 0 32 52 29 -45
+ 22 00 00 + 62 41 06 0 33 00 29 -45
+ 20 00 00 + 62 50 28 0 33 07 30 -46
+ 18 00 00 + 62 58 52 0 33 15 31 -46
+ 16 00 00 + 63 06 19 0 33 24 32 -47
+ 14 00 00 + 63 12 49 0 33 32 32 -47
+ 12 00 00 + 63 18 24 0 33 40 33 -47
+ 10 00 00 + 63 23 03 0 33 49 34 -48
+ 8 00 00 + 63 26 47 0 33 57 35 -48
+ 6 00 00 + 63 29 37 0 34 06 35 -48
+ 4 00 00 + 63 31 31 0 34 15 36 -49
+ 2 00 00 + 63 32 32 0 34 24 37 -49
+ 0 00 00 + 63 32 38 0 34 33 37 -49
- 2 00 00 + 63 31 51 0 34 42 38 -49
- 4 00 00 + 63 30 09 0 34 52 39 -50
- 6 00 00 + 63 27 33 0 35 01 39 -50
- 8 00 00 + 63 24 02 0 35 11 40 -50
- 10 00 00 + 63 19 37 0 35 21 40 -50
- 12 00 00 + 63 14 18 0 35 31 41 -50
- 14 00 00 + 63 08 03 0 35 41 42 -50
- 16 00 00 + 63 00 52 0 35 52 42 -50
- 18 00 00 + 62 52 45 0 36 02 43 -50
- 20 00 00 + 62 43 42 0 36 13 43 -50
- 22 00 00 + 62 33 42 0 36 24 44 -50
- 24 00 00 + 62 22 44 0 36 35 44 -50
- 26 00 00 + 62 10 47 0 36 46 45 -50
- 28 00 00 + 61 57 51 0 36 58 45 -49
- 30 00 00 + 61 43 56 0 37 09 45 -49
- 32 00 00 + 61 28 59 0 37 21 46 -49
- 34 00 00 + 61 13 02 0 37 34 46 -49
- 36 00 00 + 60 56 02 0 37 46 47 -48
- 38 00 00 + 60 37 59 0 37 59 47 -48
- 40 00 00 + 60 18 52 0 38 12 47 -48
- 42 00 00 + 59 58 40 0 38 25 48 -47
- 44 00 00 + 59 37 22 0 38 38 48 -47
- 46 00 00 + 59 14 59 0 38 52 48 -46
- 48 00 00 + 58 51 28 0 39 06 48 -46
- 50 00 00 + 58 26 49 0 39 20 48 -45
- 52 00 00 + 58 01 02 0 39 34 48 -45
- 54 00 00 + 57 34 06 0 39 49 49 -44
- 56 00 00 + 57 06 01 0 40 04 49 -43
- 58 00 00 + 56 36 46 0 40 19 49 -42
- 60 00 00 + 56 06 21 0 40 34 48 -42
- 62 00 00 + 55 34 47 0 40 50 48 -41
- 64 00 00 + 55 02 02 0 41 06 48 -40
- 66 00 00 + 54 28 08 0 41 22 48 -39
- 68 00 00 + 53 53 05 0 41 38 48 -38
- 70 00 00 + 53 16 53 0 41 55 47 -37
- 72 00 00 + 52 39 34 0 42 12 47 -36
- 74 00 00 + 52 01 09 0 42 29 46 -35
- 76 00 00 + 51 21 38 0 42 46 46 -34
- 78 00 00 + 50 41 04 0 43 03 45 -33
- 80 00 00 + 49 59 29 0 43 20 45 -32
- 82 00 00 + 49 16 55 0 43 38 44 -30
- 84 00 00 + 48 33 23 0 43 55 43 -29
- 86 00 00 + 47 48 58 0 44 13 42 -28
- 88 00 00 + 47 03 42 0 44 30 41 -26
- 90 00 00 + 46 17 38 0 44 47 40 -25
- 92 00 00 + 45 30 50 0 45 04 39 -23
- 94 00 00 + 44 43 21 0 45 21 38 -22
- 96 00 00 + 43 55 16 0 45 38 37 -20
- 98 00 00 + 43 06 40 0 45 55 36 -19
-100 00 00 + 42 17 36 0 46 11 34 -17
-102 00 00 + 41 28 09 0 46 27 33 -16
-104 00 00 + 40 38 25 0 46 43 32 -14
-106 00 00 + 39 48 27 0 46 58 30 -12
-108 00 00 + 38 58 23 0 47 12 29 -11
-110 00 00 + 38 08 16 0 47 26 27 -9
-112 00 00 + 37 18 13 0 47 40 26 -7
........ 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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