Update for (980) Anacostia - January 11/12, 2000
Update computed by Jan Manek; issued 11 Jan 2000 11:17:00 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(980) Anacostia / TYC 1893 00464 1 event on January 11/12, 2000
visible from Russia, S Finland, middle Sweden and Norway
and northern Florida
Summary
In the night January 11/12, 1999 a 10.3 mag star TYC 1893 00464 1 will be
occulted by a 89 km asteroid (980) Scylla. This update is based on
USNO/Flagstaff astrometry for the asteroid and ACT star position.
The updated path shows large ~0.5" north shift with occultation time ~0.5 minutes earlier compared to
Edwin Goffin's nominal prediction.
The path of this occultation runs over northern Russia ~23:43 UT,
southern Finland ~23:44 UT, middle Sweden and Norway ~23:45 UT. The path
then runs over Atlantic Ocean, at ~23:50 UT just SE of Newfoundland's Cape Race.
USA territory is entered shortly before 23:53 UT just south of Jacksonville, Florida.
Later path runs to twilight.
The event at one glimpse:
* date and approx. UT time of event: January 11, 2000 @ 23:44 UT (Euro)
23:53 UT (N.Am.)
* magnitude of target star: 10.3
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 6.4
* path description: given above
* Goffin's original chart reference: A00_0130(.PS.GZ).
The occultation path:
* approximate ground width [km]: 110
* uncertainty [path widths]: 1.5
* uncertainty in time [s]: 10
* map: below
* 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: TYC 1893 00464 1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 06h 45m 32.319s; +23o 52' 57.84"
* position source: ACT
* estimated accuracy ["]: 0.05" (0.03", 0.03")
* V mag [mag]: 10.29
* B-V [mag]: +0.30
* remarks: TYCHO gives quality flag 4(=high) with 'no duplicity' flag.
Target star is in middle Gemini, only 1.3 degrees SSE of 3.0 mag star
epsilon Geminorum. Target star is 2.5' NW of 9.1 mag star SAO 78714.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 1.4x1.4 degrees
* limiting magnitude is 12.5
* labeled stars have indicated SAO numbers
Data for the minor planet:
* general information:
number, name: (980) Anacostia
approx. diameter [km]: 89
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 34 USNO
number of rejected observations: 2 USNO
time covered by the observations: 1998 06 11 - 1999 12 30
rms residuals ["] (RA,DE): 0.06", 0.07"
estimated positional accuracy at epoch of event ["]: 0.07"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 23:47:26 UT
* approx. V mag of minor planet at event [mag]: 11.8
* geocentric parallax of minor planet ["]: 4.800
* magnitude drop [mag]: 1.7
* estimated maximum duration [s]: 6.4
* apparent motion of minor planet ["/h]: 37.59
* angular distance to moon, phase of moon [deg,%]: 113, 23%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
........ shortened ..........................
+ 99 00 00 + 50 39 20 23 41 18 10 -15
+ 97 00 00 + 51 27 08 23 41 21 11 -17
+ 95 00 00 + 52 13 09 23 41 24 13 -18
+ 93 00 00 + 52 57 22 23 41 27 14 -19
+ 91 00 00 + 53 39 47 23 41 31 16 -21
+ 89 00 00 + 54 20 26 23 41 34 17 -22
+ 87 00 00 + 54 59 20 23 41 38 18 -23
+ 85 00 00 + 55 36 30 23 41 42 20 -24
+ 83 00 00 + 56 11 57 23 41 47 21 -25
+ 81 00 00 + 56 45 43 23 41 51 22 -26
+ 79 00 00 + 57 17 51 23 41 56 23 -28
+ 77 00 00 + 57 48 22 23 42 00 24 -29
+ 75 00 00 + 58 17 19 23 42 05 25 -30
+ 73 00 00 + 58 44 42 23 42 10 26 -31
+ 71 00 00 + 59 10 35 23 42 15 27 -31
+ 69 00 00 + 59 35 00 23 42 20 28 -32
+ 67 00 00 + 59 57 58 23 42 25 29 -33
+ 65 00 00 + 60 19 32 23 42 30 30 -34
+ 63 00 00 + 60 39 43 23 42 35 31 -35
+ 61 00 00 + 60 58 34 23 42 40 32 -36
+ 59 00 00 + 61 16 06 23 42 46 33 -37
+ 57 00 00 + 61 32 22 23 42 51 34 -37
+ 55 00 00 + 61 47 22 23 42 56 35 -38
+ 53 00 00 + 62 01 08 23 43 02 36 -39
+ 51 00 00 + 62 13 42 23 43 07 36 -39
+ 49 00 00 + 62 25 04 23 43 13 37 -40
+ 47 00 00 + 62 35 18 23 43 18 38 -41
+ 45 00 00 + 62 44 22 23 43 24 39 -41
+ 43 00 00 + 62 52 19 23 43 30 40 -42
+ 41 00 00 + 62 59 09 23 43 35 40 -43
+ 39 00 00 + 63 04 53 23 43 41 41 -43
+ 37 00 00 + 63 09 31 23 43 47 42 -44
+ 35 00 00 + 63 13 05 23 43 53 42 -44
+ 33 00 00 + 63 15 34 23 43 59 43 -45
+ 31 00 00 + 63 17 00 23 44 05 44 -45
+ 29 00 00 + 63 17 21 23 44 11 44 -46
+ 27 00 00 + 63 16 38 23 44 17 45 -46
+ 25 00 00 + 63 14 52 23 44 23 46 -47
+ 23 00 00 + 63 12 01 23 44 29 46 -47
+ 21 00 00 + 63 08 07 23 44 36 47 -47
+ 19 00 00 + 63 03 07 23 44 42 47 -48
+ 17 00 00 + 62 57 02 23 44 49 48 -48
+ 15 00 00 + 62 49 52 23 44 56 49 -48
+ 13 00 00 + 62 41 34 23 45 02 49 -49
+ 11 00 00 + 62 32 09 23 45 09 50 -49
+ 9 00 00 + 62 21 36 23 45 16 50 -49
+ 7 00 00 + 62 09 54 23 45 23 51 -50
+ 5 00 00 + 61 57 00 23 45 30 51 -50
+ 3 00 00 + 61 42 55 23 45 38 52 -50
+ 1 00 00 + 61 27 37 23 45 45 52 -50
- 1 00 00 + 61 11 04 23 45 53 53 -50
- 3 00 00 + 60 53 14 23 46 01 53 -50
- 5 00 00 + 60 34 07 23 46 09 53 -51
- 7 00 00 + 60 13 40 23 46 17 54 -51
- 9 00 00 + 59 51 52 23 46 25 54 -51
- 11 00 00 + 59 28 41 23 46 34 54 -51
- 13 00 00 + 59 04 05 23 46 42 54 -50
- 15 00 00 + 58 38 02 23 46 51 55 -50
- 17 00 00 + 58 10 31 23 47 00 55 -50
........ shortened ..........................
- 45 00 00 + 48 56 22 23 49 27 51 -42
- 47 00 00 + 48 04 17 23 49 39 50 -41
- 49 00 00 + 47 10 36 23 49 51 49 -40
- 51 00 00 + 46 15 23 23 50 03 48 -39
- 53 00 00 + 45 18 38 23 50 15 47 -38
- 55 00 00 + 44 20 28 23 50 27 46 -37
- 57 00 00 + 43 20 55 23 50 39 45 -35
- 59 00 00 + 42 20 05 23 50 51 44 -34
- 61 00 00 + 41 18 03 23 51 03 42 -32
- 63 00 00 + 40 14 55 23 51 14 41 -31
- 65 00 00 + 39 10 48 23 51 26 39 -29
- 67 00 00 + 38 05 48 23 51 37 38 -28
- 69 00 00 + 37 00 03 23 51 49 36 -26
- 71 00 00 + 35 53 40 23 51 59 34 -24
- 73 00 00 + 34 46 49 23 52 10 33 -23
- 75 00 00 + 33 39 37 23 52 20 31 -21
- 77 00 00 + 32 32 12 23 52 30 29 -19
- 79 00 00 + 31 24 44 23 52 39 27 -17
- 81 00 00 + 30 17 21 23 52 48 25 -15
- 83 00 00 + 29 10 12 23 52 56 23 -13
- 85 00 00 + 28 03 27 23 53 04 22 -11
........ 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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