Update for (227) Philosophia - January 27/28, 2003 - South Africa
Update computed by Jan Manek; issued 19 Jan 2003 21:25 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(227) Philosophia / TYC 1403-00969-1 on January 27/28, 2003
visible from South Africa, S Brazil, S Uruguay, N Argentina and mid-Chile
Summary
In the night of January 27/28, 2003 a faint 11.8 mag star TYC 1403-00969-1
will be occulted by a 90 km asteroid (227) Philosophia. This update is based on
USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.
The updated path shows ~11 path width south shift with time 0.8 minutes later compared to
Edwin Goffin's nominal prediction.
Updated path runs south of South Africa ~1:35.3 UT with Cape Town close to north limit, later over
S Brazil ~1:43.3 UT, S Uruguay ~1:43.8 UT, N Argentina around 1:44.2 UT and mid-Chile ~1:44.7 UT.
Please check the path chart for details.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: January 28, 2003 @ 01:35 UT (S.Africa)
01:44 UT (S.America)
* magnitude of target star: 11.8
* magnitude drop [mag]: 1.6
* estimated maximum duration [s]: 7.0
* path description: given above
* Goffin's original chart reference: A03_0125
The occultation path:
* approximate ground width [km]: 130
* uncertainty [path widths]: 1.0
* uncertainty in time [s]: 8
* 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 1403-00969-1
* constellation: Leo
* J2000 position [h,m,s; o,',"]: 09h 33m 04.7522s; +17o 26' 15.006"
* position source: recent UCAC position combined with Tycho-2 proper motion
* estimated accuracy ["]: 0.03" (0.02", 0.02")
* V mag [mag]: 11.78
* B-V [mag]: +0.96
* remarks:
Target star is in west Leo, about 8.2 degrees west of 3.5 mag star eta Leonis = SAO 98955
or 1.4 degrees northwest of 5.7 mag star 8 Leonis = SAO 98673.
!!! IMPORTANT !!!
Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields
the 'non-stars' are often real stars or blends of close pairs. Be careful about this.
Close finding chart (prepared in GUIDE7):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 13.5
* labeled stars have indicated SAO numbers
* remarks:
Data for the minor planet:
* general information:
number, name: (227) Philosophia
approx. diameter [km]: 90
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone)
number of used observations: 120 USNO
number of rejected observations: 15 USNO
time covered by the observations: 1998 03 11 - 2003 01 12
rms residuals ["] (RA,DE): 0.08", 0.08"
estimated positional accuracy at epoch of event ["]: 0.06", 0.05"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 01:39.1 UT
* approx. V mag of minor planet at event [mag]: 13.1
* geocentric parallax of minor planet ["]: 4.184
* magnitude drop [mag]: 1.6
* estimated maximum duration [s]: 7.0
* apparent motion of minor planet ["/h]: 30.35
* angular distance to moon, phase of moon [deg,%]: 113, 21%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2003 Jan 28
227 Philosophia
1h 39.1m UT
03-00969-1 11.8 9 33 4.752 17 26 15.01TYC 1403-00969-1
13.1 90 7.0 2.102 -2.100 4.35
-8.433 17.435 158.42 -18.34
1.6523 -.10094 -.69885 -7.17917 1.03990 -0.00133 0.00015
2000 287.8473082003 121.00000261.841766327.8096449.147429 0.199193803.155614402.527035598.695 0.15
RATE 1.7582400 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
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 ' "
Latitude Latitude
28 0 0 -38 11 31 1 34 30 25 -18 -37 33 49 -38 49 40
27 0 0 -37 50 47 1 34 35 26 -18 -37 13 10 -38 28 52
26 0 0 -37 30 13 1 34 39 27 -19 -36 52 41 -38 8 13
25 0 0 -37 9 49 1 34 44 28 -20 -36 32 22 -37 47 44
24 0 0 -36 49 36 1 34 49 28 -21 -36 12 13 -37 27 26
23 0 0 -36 29 34 1 34 54 29 -22 -35 52 16 -37 7 19
22 0 0 -36 9 43 1 34 59 30 -22 -35 32 30 -36 47 24
21 0 0 -35 50 5 1 35 4 30 -23 -35 12 56 -36 27 40
20 0 0 -35 30 39 1 35 10 31 -24 -34 53 35 -36 8 9
19 0 0 -35 11 26 1 35 15 32 -25 -34 34 27 -35 48 52
18 0 0 -34 52 27 1 35 21 33 -25 -34 15 33 -35 29 47
17 0 0 -34 33 42 1 35 26 33 -26 -33 56 53 -35 10 57
16 0 0 -34 15 12 1 35 32 34 -27 -33 38 27 -34 52 22
........................... shortened .............................
- 41 0 0 -26 1 8 1 42 15 37 -42 -25 26 43 -26 35 54
- 42 0 0 -26 3 55 1 42 22 36 -42 -25 29 29 -26 38 42
- 43 0 0 -26 7 8 1 42 28 36 -41 -25 32 40 -26 41 56
- 44 0 0 -26 10 45 1 42 34 35 -41 -25 36 17 -26 45 35
- 45 0 0 -26 14 48 1 42 40 34 -40 -25 40 17 -26 49 39
- 46 0 0 -26 19 15 1 42 46 34 -40 -25 44 43 -26 54 8
- 47 0 0 -26 24 7 1 42 52 33 -39 -25 49 34 -26 59 1
- 48 0 0 -26 29 24 1 42 58 32 -39 -25 54 49 -27 4 20
- 49 0 0 -26 35 6 1 43 4 32 -38 -26 0 29 -27 10 4
- 50 0 0 -26 41 12 1 43 9 31 -38 -26 6 33 -27 16 13
- 51 0 0 -26 47 43 1 43 15 30 -37 -26 13 2 -27 22 46
- 52 0 0 -26 54 39 1 43 20 29 -37 -26 19 55 -27 29 44
- 53 0 0 -27 1 59 1 43 26 29 -36 -26 27 13 -27 37 7
- 54 0 0 -27 9 44 1 43 31 28 -35 -26 34 55 -27 44 54
- 55 0 0 -27 17 53 1 43 36 27 -35 -26 43 1 -27 53 6
- 56 0 0 -27 26 26 1 43 41 27 -34 -26 51 31 -28 1 42
- 57 0 0 -27 35 23 1 43 45 26 -33 -27 0 26 -28 10 42
- 58 0 0 -27 44 44 1 43 50 25 -33 -27 9 44 -28 20 7
- 59 0 0 -27 54 29 1 43 54 24 -32 -27 19 25 -28 29 55
- 60 0 0 -28 4 38 1 43 59 23 -31 -27 29 31 -28 40 7
- 61 0 0 -28 15 10 1 44 3 23 -31 -27 39 59 -28 50 42
- 62 0 0 -28 26 5 1 44 7 22 -30 -27 50 51 -29 1 41
- 63 0 0 -28 37 24 1 44 11 21 -29 -28 2 6 -29 13 4
- 64 0 0 -28 49 5 1 44 15 20 -28 -28 13 44 -29 24 49
- 65 0 0 -29 1 10 1 44 19 19 -28 -28 25 45 -29 36 58
- 66 0 0 -29 13 37 1 44 22 18 -27 -28 38 8 -29 49 29
- 67 0 0 -29 26 26 1 44 25 18 -26 -28 50 53 -30 2 22
- 68 0 0 -29 39 38 1 44 29 17 -25 -29 4 1 -30 15 38
- 69 0 0 -29 53 11 1 44 32 16 -25 -29 17 30 -30 29 16
- 70 0 0 -30 7 7 1 44 35 15 -24 -29 31 21 -30 43 16
- 71 0 0 -30 21 23 1 44 37 14 -23 -29 45 33 -30 57 37
- 72 0 0 -30 36 1 1 44 40 13 -22 -30 0 6 -31 12 19
- 73 0 0 -30 50 60 1 44 42 13 -21 -30 15 0 -31 27 22
- 74 0 0 -31 6 19 1 44 45 12 -20 -30 30 15 -31 42 46
- 75 0 0 -31 21 58 1 44 47 11 -20 -30 45 50 -31 58 31
- 76 0 0 -31 37 57 1 44 49 10 -19 -31 1 44 -32 14 35
........................... 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-|
--------------------------------------------------------------------U---U---
Be sure to use the RELOAD button of your browser,
so you will surely use the latest version of predictions page!