Update for (925) Alphonsina - November 29/30, 2003
Update computed by Jan Manek; issued 23 Nov 2003 20:26 +0100 (CET)
2nd update computed by Jan Manek; issued 26 Nov 2003 23:04 +0100 (CET)
Jan Manek's update
IOTA/IOTA-ES occultation update for
(925) Alphonsina / TYC 3359-02490-1 on November 29/30, 2003
visible from Scandinavia, central Europe and Italy
Summary
In the night of November 29/30, 2003 a faint 11.8 mag star TYC 3359-02490-1
will be occulted by a 57 km asteroid (925) Alphonsina. This update is based on
USNO/Flagstaff, TMO and Ondrejov astrometry for the asteroid and Tycho-2 star position.
The updated path shows ~6 path width south shift with small time shift compared to
Edwin Goffin's nominal prediction.
Updated path runs due to south shift over Scandinavia around 17:41 UT, central Europe around 17:43 UT and Italy ~17:44 UT.
Please check the path chart for details.
The target Tycho-2 star has no proper motion, is not in UCAC2, AC2000.2 ... Therefore the large uncertainty.
On December 22/23, 2003 will be excellent occultation of 6.2 mag star HIP 23799 running over areas with a lot of observers.
This occultation is a good chance to test if Alphonsina has the expected diameter. Unfortunately we don't have good star position so
we can't use even the positive report for improvement of the December event.
Here is current station list for European cities.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: November 29, 2003 @ 17:43 UT (Europe)
* magnitude of target star: 11.8
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 5.2
* path description: given above
* Goffin's original chart reference: A03_1134
The occultation path:
* approximate ground width [km]: 80
* uncertainty [path widths]: 6.5
* uncertainty in time [s]: 35
* 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 3359-02490-1
* constellation: Auriga
* J2000 position [h,m,s; o,',"]: 05h 36m 37.078 s; +45o 39' 57.58 "
* position source: Tycho-2
* estimated accuracy ["]: 0.4" (0.3", 0.3")
* V mag [mag]: 11.79
* B-V [mag]: +0.68
* remarks:
Target star is in north Auriga, about 3.5 degrees east of 0.2 mag star alpha Aurigae = SAO 40186
or 2' east of 8.4 mag star SAO 40471.
This Tycho-2 star has no proper motion, is not in UCAC2, AC2000.2 ... Therefore the large uncertainty.
!!! 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 GUIDE8):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 12.5
* labeled stars have indicated SAO numbers
* remarks: Second chart shows 30' blowup to show correctly the star in field.
Data for the minor planet:
* general information:
number, name: (925) Alphonsina
approx. diameter [km]: 57
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), Ondrejov (Kusnirak, Sarounova, Manek)
number of used observations: 95 USNO, 18 TMO, 12 Ondrejov
number of rejected observations: 22 USNO
time covered by the observations: 1998 08 02 - 2003 11 08
rms residuals ["] (RA,DE): 0.06", 0.06"
estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 17:38.4 UT
* approx. V mag of minor planet at event [mag]: 12.2
* geocentric parallax of minor planet ["]: 5.210
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 5.2
* apparent motion of minor planet ["/h]: 32.29
* angular distance to moon, phase of moon [deg,%]: 120, 40%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2003 Nov 29
925 Alphonsina
17h 38.4m UT
11.8 5 36 37.078 45 39 57.58TYC 3359-02490-1* 12.4
12.2 57 5.2 1.688 -2.993 -7.72
-248.646 45.669 -87.53 -21.49
17.6403 -.16903 .69032 -6.01846 -1.47871 -0.00174 -0.00219
2000 301.80751020031127.00000202.449343299.80220321.073101 0.080634832.699917552.482210178.335 0.15
RATE 2.2216640 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Centre Star Star Sun Path Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
...................................... shortened .............................................
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Latitude Latitude Latitude Latitude
22 0 0 67 17 6 17 40 36 41 69 -27 .. .. .. 64 17 31 .. .. .. 48 17 0
21 0 0 63 47 49 17 41 9 40 66 -28 67 1 25 61 34 48 .. .. .. 46 45 13
20 0 0 60 57 42 17 41 35 38 63 -27 63 14 25 59 7 36 .. .. .. 45 13 52
19 0 0 58 26 13 17 41 58 37 61 -27 60 17 38 56 50 32 .. .. .. 43 43 4
18 0 0 56 6 23 17 42 18 35 59 -27 57 42 28 54 40 52 .. .. .. 42 12 56
17 0 0 53 54 52 17 42 36 33 57 -26 55 20 22 52 37 2 .. .. .. 40 43 34
16 0 0 51 49 49 17 42 53 32 55 -26 53 7 25 50 38 3 .. .. .. 39 15 4
15 0 0 49 50 2 17 43 9 30 54 -25 51 1 27 48 43 14 .. .. .. 37 47 33
14 0 0 47 54 46 17 43 23 29 52 -24 49 1 10 46 52 6 .. .. .. 36 21 4
13 0 0 46 3 28 17 43 37 27 51 -23 47 5 42 45 4 20 .. .. .. 34 55 42
12 0 0 44 15 44 17 43 49 25 50 -22 45 14 26 43 19 39 .. .. .. 33 31 31
11 0 0 42 31 17 17 44 0 24 49 -21 43 26 56 41 37 52 .. .. .. 32 8 35
10 0 0 40 49 53 17 44 10 22 48 -20 41 42 52 39 58 49 .. .. .. 30 46 57
9 0 0 39 11 21 17 44 20 20 47 -19 40 1 59 38 22 24 .. .. .. 29 26 40
8 0 0 37 35 33 17 44 28 19 46 -18 38 24 6 36 48 30 54 44 44 28 7 46
7 0 0 36 2 23 17 44 36 17 45 -17 36 49 2 35 17 2 51 20 12 26 50 18
6 0 0 34 31 44 17 44 43 15 45 -16 35 16 41 33 47 57 48 34 27 25 34 18
5 0 0 33 3 31 17 44 49 14 44 -15 33 46 56 32 21 10 46 9 12 24 19 48
4 0 0 31 37 41 17 44 54 12 43 -14 32 19 41 30 56 39 43 57 27 23 6 48
3 0 0 30 14 10 17 44 59 11 43 -12 30 54 53 29 34 20 41 55 39 21 55 21
2 0 0 28 52 55 17 45 3 9 42 -11 29 32 26 28 14 12 40 1 42 20 45 27
1 0 0 27 33 53 17 45 6 7 42 -10 28 12 18 26 56 13 38 14 14 19 37 6
0 0 0 26 17 1 17 45 9 6 41 -9 26 54 24 25 40 19 36 32 19 18 30 21
...................................... 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 AT worldonline.cz |-O-O-|
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Jan Manek's 2nd update
IOTA/IOTA-ES occultation update for
(925) Alphonsina / TYC 3359-02490-1 on November 29/30, 2003
visible from W Norway, Netherlands, Belgium, France and E Spain
Summary
In the night of November 29/30, 2003 a faint 11.8 mag star TYC 3359-02490-1
will be occulted by a 57 km asteroid (925) Alphonsina. This update is based on
USNO/Flagstaff, TMO and Ondrejov astrometry for the asteroid and recent astrometry star position.
The updated path shows ~3 path width north shift with time 1.5 minutes later compared to
Edwin Goffin's nominal prediction or ~9 path widths north of first update.
Updated path runs due to north shift over W Norway ~17:42.7 UT, Netherlands and Belgium ~17:43.7 UT,
France from north to south around 17:44.3 UT and E Spain ~17:45.0 UT.
Please check the path chart for details.
Main reason for another update was that I got new data for target star. Recent UCAC2 star position was kindly provided by Marion and Norbert Zacharias.
Moreover Herbert Raab organised with Reiner Stoss starfield imaging at station 620 on Mallorca from which I have performed astrometry of the target star.
Combining these data with the original Tycho-2 data was derived proper motion and current star position could be determined with rather good accuracy.
It turned out that the star has noticeable proper motion so it moved more than 0.5" in last 12 years and the new path is totally out if my previous error estimate.
On December 22/23, 2003 will be excellent occultation of 6.2 mag star HIP 23799 running over areas with a lot of observers.
This occultation is a good chance to test if Alphonsina has the expected diameter and possibly even to check the ephemeris.
Here is current station list for observers and European cities.
Clear sky and good luck !!!
The event at one glimpse:
* date and approx. UT time of event: November 29, 2003 @ 17:44 UT (Europe)
* magnitude of target star: 11.8
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 5.2
* path description: given above
* Goffin's original chart reference: A03_1134
The occultation path:
* approximate ground width [km]: 90
* uncertainty [path widths]: 1.3
* uncertainty in time [s]: 7
* 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 3359-02490-1
* constellation: Auriga
* J2000 position [h,m,s; o,',"]: 05h 36m 37.0261s; +45o 39' 57.040"
* position source: UCAC2 and recent astrometry
* estimated accuracy ["]: 0.04" (0.03", 0.03")
* V mag [mag]: 11.79
* B-V [mag]: +0.68
* remarks:
Target star is in north Auriga, about 3.5 degrees east of 0.2 mag star alpha Aurigae = SAO 40186
or 2' east of 8.4 mag star SAO 40471.
Recent UCAC2 star position was kindly provided by Marion and Norbert Zacharias.
Moreover Herbert Raab organised with Reiner Stoss starfield imaging at station 620 on Mallorca from which I have performed astrometry of the target star.
Combining these data with the original Tycho-2 data was derived proper motion and current star position could be determined with rather good accuracy.
!!! 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 GUIDE8):
* occulted star is in center - labeled with cross
* field is 3.0x3.0 degrees
* limiting magnitude is 12.5
* labeled stars have indicated SAO numbers
* remarks: Second chart shows 30' blowup to show correctly the star in field.
Data for the minor planet:
* general information:
number, name: (925) Alphonsina
approx. diameter [km]: 57
* orbital information
orbit source: calculation Manek
source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), Ondrejov (Kusnirak, Sarounova, Manek)
number of used observations: 95 USNO, 18 TMO, 12 Ondrejov
number of rejected observations: 22 USNO
time covered by the observations: 1998 08 02 - 2003 11 08
rms residuals ["] (RA,DE): 0.06", 0.06"
estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
remarks:
Data for the event:
* UT date and time of least geocentric approach: 17:39.7 UT
* approx. V mag of minor planet at event [mag]: 12.2
* geocentric parallax of minor planet ["]: 5.210
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 5.2
* apparent motion of minor planet ["/h]: 32.29
* angular distance to moon, phase of moon [deg,%]: 120, 40%
* remarks:
Elements for WinOccult:
============ cut here ===========================================
2003 Nov 29
925 Alphonsina
17h 39.7m UT
11.8 5 36 37.026 45 39 57.04TYC 3359-02490-1 12.5
12.2 57 5.2 1.688 -2.993 -7.72
-248.958 45.669 -87.84 -21.49
17.6610 -.18723 .76434 -6.01854 -1.47883 -0.00174 -0.00219
2000 301.80751020031127.00000202.449343299.80220321.073101 0.080634832.699917552.482210178.335 0.15
RATE 2.2216640 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================
Calculator(s): Jan Manek
Path coordinates:
Centre Star Star Sun Path Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
...................................... shortened .............................................
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Latitude Latitude Latitude Latitude
9 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 60 0 50
8 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 54 35 18
7 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 51 17 8
6 0 0 57 53 50 17 42 56 31 52 -20 .. .. .. 53 43 4 .. .. .. 48 34 7
5 0 0 52 30 3 17 43 40 27 49 -19 55 54 33 50 16 42 .. .. .. 46 10 23
4 0 0 49 13 53 17 44 4 24 48 -18 51 19 18 47 31 2 .. .. .. 43 59 34
3 0 0 46 33 20 17 44 22 22 46 -17 48 12 15 45 6 35 55 13 21 41 58 22
2 0 0 44 12 25 17 44 36 20 45 -15 45 36 40 42 56 1 50 19 48 40 4 47
1 0 0 42 4 40 17 44 48 18 44 -14 43 19 15 40 55 39 47 10 42 38 17 32
0 0 0 40 6 42 17 44 59 16 43 -13 41 14 20 39 3 19 44 35 18 36 35 44
- 1 0 0 38 16 32 17 45 7 14 42 -12 39 18 49 37 17 35 42 18 56 34 58 43
- 2 0 0 36 32 49 17 45 15 12 42 -10 37 30 51 35 37 31 40 15 32 33 26 0
- 3 0 0 34 54 40 17 45 21 11 41 -9 35 49 12 34 2 24 38 21 49 31 57 12
- 4 0 0 33 21 23 17 45 26 9 40 -8 34 12 59 32 31 43 36 35 52 30 32 0
- 5 0 0 31 52 28 17 45 30 7 40 -7 32 41 33 31 5 3 34 56 21 29 10 9
- 6 0 0 30 27 31 17 45 33 6 39 -5 31 14 26 29 42 4 33 22 24 27 51 28
- 7 0 0 29 6 14 17 45 35 4 39 -4 29 51 14 28 22 31 31 53 19 26 35 46
- 8 0 0 27 48 21 17 45 37 3 38 -3 28 31 39 27 6 11 30 28 36 25 22 53
- 9 0 0 26 33 38 17 45 38 1 38 -1 27 15 27 25 52 52 29 7 52 .. .. ..
- 10 0 0 .. .. .. .. .. .. .. .. .. 26 2 23 .. .. .. 27 50 48 .. .. ..
...................................... 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 AT worldonline.cz |-O-O-|
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