Update for (1481) Tubingia - February 17, 2000
Update computed by Jan Manek; issued 15 Feb 2000 14:42:00 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(1481) Tubingia / TYC 1872-01508-1 event on February 17, 2000
visible from SE Lithuania, Poland, middle Germany, N France,
very NW Spain and finally South America
Summary
In the night of February 17, 2000 a 10.4 mag star TYC 1872-01508-1 will
be occulted by a small 36 km asteroid (1481) Tubingia. This update is
based on USNO/Flagstaff astrometry for the asteroid and Tycho-2 star
position.
The updated path shows ~0.3" south shift with time ~0.5 minutes later compared to
Edwin Goffin's nominal prediction.
The path of this occultation runs over SE Lithuania ~22:45 UT, mostly northern
Poland ~22:46-22:49 UT, middle Germany from NE to SW at
~22:50-22:52 UT, Luxembourg with very SE tip of Belgium ~22:53 UT,
mainly northern France from NE to SW ~22:53-22:57 UT and finally very NW
part of Spain ~23:02-23:03 UT. After crossing Atlantic ocean path runs over Brasilia
~23:45-24:00 UT, very SE Bolivia, NW Paraguay ~0:01-0:04 UT and N Argetina ~0:05-0:08 UT.
Motion of the asteroid is very slow, producing almost 18 seconds long event even
for this 36km small object. Therefore please consult the path map to find the time
of the closest approach to our site and select the about 8 minute observing window
centered on your time. The times for Europe are around 22:50 UT. However uncertainity
is full 7 path widths, keep this in mind - there is whole Belgium, Netherlands, Poland,
Czech Republic, south England etc. within the _error_ path.
The event at one glimpse:
* date and approx. UT time of event: February 17, 2000 @ 22:52 UT (Euro)
23:50 UT (S.Am.)
* magnitude of target star: 10.4
* magnitude drop [mag]: 5.2
* estimated maximum duration [s]: 17.7
* path description: given above
* Goffin's original chart reference: A00_0229.
The occultation path:
* approximate ground width [km]: 37
* uncertainty [path widths]: 7
* uncertainty in time [s]: 2.4 _minutes_ (!)
* map: below
* remarks: Path uncertainities are given according to nominal star
position errors and expected asteroid positional accuracy.
!!!!!!!
Thick line indicates the centerline for this event.
!!!!!!!
Data for the target star:
* name: TYC 1872-01508-1
* constellation: Gemini
* J2000 position [h,m,s; o,',"]: 06h 07m 10.422s; +27o 31' 04.33"
* position source: Tycho-2
* estimated accuracy ["]: 0.07" (0.04", 0.06")
* V mag [mag]: 10.39
* B-V [mag]: +1.05
* remarks:
Target star is in western Gemini, ~3.2 degrees north of open cluster
M35 and 6.1 degrees NW of 2.9 mag red star mui Geminorum. There is
8.0 mag star SAO 78000 ~12' ESE of target and also two stars
(9.6 mag/GSC 1872.2340/2.7' NW; 10.4 mag/GSC 1872.2326/2.7' SW)
forming nice triangle with target star and serving as good reference
stars too.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 2.0x2.0 degrees
* limiting magnitude is 12.5
* labeled stars have indicated SAO numbers
Data for the minor planet:
* general information:
number, name: (1481) Tubingia
approx. diameter [km]: 36
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 41 USNO
number of rejected observations: 4 USNO
time covered by the observations: 1998 08 16 - 2000 02 02
rms residuals ["] (RA,DE): 0.08", 0.10"
estimated positional accuracy at epoch of event ["]: 0.09"
remarks: Faint object; scatter in residuals.
Data for the event:
* UT date and time of least geocentric approach: 23:24:08 UT
* approx. V mag of minor planet at event [mag]: 15.6
* geocentric parallax of minor planet ["]: 3.516
* magnitude drop [mag]: 5.2
* estimated maximum duration [s]: 17.7
* apparent motion of minor planet ["/h]: 4.03
* angular distance to moon, phase of moon [deg,%]: 34, 96%
* remarks:
Calculator(s): Jan Manek
Path coordinates:
Altitude
E. Longitude Latitude U.T. star sun
........ shortened ..........................
+ 73 00 00 + 51 44 24 22 34 27 12 -35
+ 71 00 00 + 52 19 39 22 34 43 13 -35
+ 69 00 00 + 52 51 36 22 35 00 14 -36
+ 67 00 00 + 53 20 27 22 35 19 15 -37
+ 65 00 00 + 53 46 23 22 35 38 17 -37
+ 63 00 00 + 54 09 33 22 35 58 18 -38
+ 61 00 00 + 54 30 05 22 36 19 19 -39
+ 59 00 00 + 54 48 07 22 36 40 20 -39
+ 57 00 00 + 55 03 45 22 37 03 21 -40
+ 55 00 00 + 55 17 05 22 37 26 22 -40
+ 53 00 00 + 55 28 10 22 37 51 23 -41
+ 51 00 00 + 55 37 05 22 38 16 25 -42
+ 49 00 00 + 55 43 52 22 38 41 26 -42
+ 47 00 00 + 55 48 35 22 39 08 27 -43
+ 45 00 00 + 55 51 15 22 39 35 28 -43
+ 43 00 00 + 55 51 55 22 40 04 29 -44
+ 41 00 00 + 55 50 33 22 40 33 30 -44
+ 39 00 00 + 55 47 12 22 41 03 31 -45
+ 37 00 00 + 55 41 51 22 41 34 32 -45
+ 35 00 00 + 55 34 29 22 42 07 33 -45
+ 33 00 00 + 55 25 05 22 42 40 34 -46
+ 31 00 00 + 55 13 38 22 43 14 35 -46
+ 29 00 00 + 55 00 06 22 43 50 36 -47
+ 27 00 00 + 54 44 27 22 44 27 37 -47
+ 25 00 00 + 54 26 36 22 45 05 38 -48
+ 23 00 00 + 54 06 32 22 45 45 39 -48
+ 21 00 00 + 53 44 09 22 46 27 40 -48
+ 19 00 00 + 53 19 24 22 47 10 42 -49
+ 17 00 00 + 52 52 12 22 47 55 43 -49
+ 15 00 00 + 52 22 27 22 48 41 44 -49
+ 13 00 00 + 51 50 04 22 49 30 45 -50
+ 11 00 00 + 51 14 55 22 50 21 46 -50
+ 9 00 00 + 50 36 54 22 51 14 48 -50
+ 7 00 00 + 49 55 53 22 52 10 49 -50
+ 5 00 00 + 49 11 45 22 53 08 50 -51
+ 3 00 00 + 48 24 19 22 54 10 51 -51
+ 1 00 00 + 47 33 28 22 55 14 53 -51
- 1 00 00 + 46 39 01 22 56 21 54 -51
- 3 00 00 + 45 40 49 22 57 32 56 -51
- 5 00 00 + 44 38 39 22 58 46 57 -51
- 7 00 00 + 43 32 22 23 00 04 59 -52
- 9 00 00 + 42 21 46 23 01 27 60 -52
- 11 00 00 + 41 06 39 23 02 53 62 -51
- 13 00 00 + 39 46 48 23 04 24 63 -51
- 15 00 00 + 38 22 02 23 06 00 65 -51
- 17 00 00 + 36 52 08 23 07 40 67 -51
- 19 00 00 + 35 16 55 23 09 26 68 -51
........ shortened ..........................
- 49 00 00 - 1 16 59 23 46 13 61 -33
- 51 00 00 - 4 42 10 23 49 09 58 -31
- 53 00 00 - 8 15 47 23 52 05 54 -28
- 55 00 00 - 11 58 00 23 54 59 51 -26
- 57 00 00 - 15 48 56 23 57 49 47 -24
- 59 00 00 - 19 48 35 24 00 34 43 -21
- 61 00 00 - 23 56 44 24 03 12 38 -18
- 63 00 00 - 28 12 48 24 05 39 34 -15
- 65 00 00 - 32 35 35 24 07 54 30 -13
- 67 00 00 - 37 03 00 24 09 53 25 -10
- 69 00 00 - 41 31 50 24 11 33 20 -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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