Archive for April, 2011

Mittwoch, April 20th, 2011

Station Map for the Occultation by (1902) Shaposhnikov at Friday, 2011 April 22 (~ 03:15 UT)

Trans-Atlantic-Event!
Path will cross Canada too.

Magnitude of target star 2UCAC 32545066: 11.8 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 12.1 mag (data from UCAC3)

The max duration is expected to be 5.9 sec with a max drop of 3.9 mag.
The event will take place at an altitude of 29 deg and at azimuth 246 deg. The sun will be at an altitude of -24 deg. (At predicted centre line for longitude W 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.93 path widths.
The probabilities to see a positive event:

Centre line: ~  41 %
Path limits: ~  36 %
1 sigma lines:  ~ 14 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0422_1902_23677.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110422_23677_Sites.txt
Good luck with your observation!

Oliver Klös
IOTA-ES

(1902) Shaposhnikov, 2011 April 22, Station Map

Sonntag, April 17th, 2011

Station Map for the Occultation by (581) Tauntonia at Wednesday, 2011 April 20 (~ 03:33 UT)

Trans-Atlantic-Event!

Path will cross E Canada and NW U.S.A. too.

V-Magnitude of target star TYC 1992-01497-1: 12.0 mag
Johnson B-V Colour Index: + 0.4
UCAC instrumental „pseudo-R“ fit-model magnitude: 11.5 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.7 mag (the magnitude of the asteroid).

The max duration is expected to be 6.1 sec with a max drop of 2.8 mag.
The event will take place at an altitude of 32 deg and at azimuth 279 deg. The sun will be at an altitude of -16 deg. (At predicted centre line for longitude E 01 deg)

There is a 1 sigma uncertainty interval of  ± 0.73 path widths.
The probabilities to see a positive event:

Centre line: ~  51 %
Path limits: ~  42 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0420_581_23670.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110420_23670_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(581) Tauntonia, 2011 April 20, Station Map

Freitag, April 15th, 2011

Station Map for the Occultation by (1080) Orchis at Tuesday, 2011 April 19 (~ 19:26 UT)

 UPDATE (S.Preston), 2011 April 16:

Path shift of ~ 10 km to the North (perpendicular to the path)

V-Magnitude of target star TYC 1855-01011-1: 9.8 mag
Johnson B-V Colour Index: + 0.5
UCAC instrumental „pseudo-R“ fit-model magnitude: 9.7 mag (data from UCAC3)

The max duration is expected to be 0.6 sec with a max drop of 6.8 mag.
The event will take place at an altitude of 28 deg and at azimuth 278 deg. The sun will be at an altitude of -14 deg. (At predicted centre line for longitude E20 deg)

There is a 1 sigma uncertainty interval of  ± 1.69 path widths.
The probabilities to see a positive event:

Centre line: ~  23 %
Path limits: ~  22 %
1 sigma lines:  ~ 10 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0419_1080_25038.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110419_25038_Sites.txt

Good luck with your observation!

Oliver Klös

IOTA-ES

(1080) Orchis, 2011 April 19; Station Map

Freitag, April 15th, 2011

Station Map for the Occultation by (554) Peraga at Sunday, 2011 April 17 (~ 19:58 UT)

Magnitude of target star 2UCAC 39302834: 13.0 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.2 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 13.6 mag (the magnitude of the asteroid).

The max duration is expected to be 4.0 sec with a max drop of 1.1 mag.
The event will take place at an altitude of 45 deg and at azimuth 253 deg. The sun will be at an altitude of -18 deg. (At predicted centre line for longitude E10 deg)

There is a 1 sigma uncertainty interval of  ± 1.05 path widths.
The probabilities to see a positive event:

Centre line: ~  37 %
Path limits: ~  33 %
1 sigma lines:  ~ 13 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0417_554_28708.htm

Good luck with your observation!

Oliver Klös
IOTA-ES

(554) Peraga, 2011 April 17, Station Map

Mittwoch, April 13th, 2011

Station Maps for the Occultation by (58) Concordia at Saturday, 2011 April 16 (~ 23:25 UT)

Magnitude of target star 2UCAC 31339336: 12.9 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.2 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.3 mag (the magnitude of the asteroid).

The max duration is expected to be 10.1 sec with a max drop of 0.49 mag.
The event will take place at an altitude of 42 deg and at azimuth 195 deg. The sun will be at an altitude of -34 deg. (At predicted centre line for longitude E10 deg)

There is a 1 sigma uncertainty interval of  ± 0.71 path widths.
The probabilities to see a positive event:

Centre line: ~  52 %
Path limits: ~  42 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0416_58_25988.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110416_25988_Sites.txt
Good luck with your observation!

Oliver Klös
IOTA-ES

(58) Concordia, 2011 April 16; Station Map NORTH (58) Concordia, 2011 April 16, Station Map SOUTH

Mittwoch, April 13th, 2011

Station Map for the Occultation by (709) Fringilla at Saturday, 2011 April 16 (~ 19:36 UT)

V-Magnitude of target star TYC 4905-00342-1: 12.4 mag
Johnson B-V Colour Index: + 0.6
UCAC instrumental „pseudo-R“ fit-model magnitude: 12.1 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 14.3 mag (the magnitude of the asteroid).

The max duration is expected to be 16.6 sec with a max drop of 2.1 mag.
The event will take place at an altitude of 38 deg and at azimuth 177 deg. The sun will be at an altitude of -15 deg. (At predicted centre line for longitude E15 deg)

There is a 1 sigma uncertainty interval of  ± 0.55 path widths.
The probabilities to see a positive event:

Centre line: ~  63 %
Path limits: ~  47 %
1 sigma lines:  ~ 16 %
2 sigma lines: ~ 2 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0416_709_23658.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110416_23658_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20April.htm

Good luck with your observation!

Oliver Klös
IOTA-ES

(709) Fringilla at Sunday, 2011 April 16, Station Map

Montag, April 11th, 2011

Station Map for the Occultation by (640) Brambilla at Tuesday, 2011 April 12 (~ 18:43 UT)

V-Magnitude of target star TYC 0741-01511-1: 10.8 mag
Johnson B-V Colour Index: + 0.5
UCAC instrumental „pseudo-R“ fit-model magnitude: 10.5 mag (data from UCAC3)

The max duration is expected to be 3.9 sec with a max drop of 4.4 mag.
The event will take place at an altitude of 46 deg and at azimuth 235 deg. The sun will be at an altitude of -11 deg. (At predicted centre line for longitude E 13 deg)

There is a 1 sigma uncertainty interval of  ± 0.75 path widths.
The probabilities to see a positive event:

Centre line: ~  49 %
Path limits: ~  41 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0412_640_23644.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110412_23644_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(640) Brambilla, 2011 April 12, Station Map

Montag, April 11th, 2011

Station Map for the Occultation by (59) Elpis at Tuesday, 2011 April 12 (~ 02:33 UT)

Magnitude of target star 2UCAC 27508035: 13.1 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.5 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 13.0 mag (the magnitude of the asteroid).

The max duration is expected to be 43.0 sec with a max drop of 0.7 mag.
The event will take place at an altitude of 31 deg and at azimuth 163 deg. The sun will be at an altitude of -23 deg. (At predicted centre line for latitude N 45 deg)

There is a 1 sigma uncertainty interval of  ± 0.72 path widths.
The probabilities to see a positive event:

Centre line: ~  51 %
Path limits: ~  42 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0412_59_25980.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110412_25980_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(59) Elpis, 2011 April 12, Station Map

Montag, April 11th, 2011

Station Map for the Occultation by (511) Davida at Tuesday, 2011 April 12 (~ 01:13 UT)

Magnitude of target star 2UCAC 25860399: 12.4 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 12.4 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.6 mag (the magnitude of the asteroid).

The max duration is expected to be 41.4 sec with a max drop of 0.9 mag.
The event will take place at an altitude of 18 deg and at azimuth 136 deg. The sun will be at an altitude of -27 deg. (At predicted centre line for longitude E 20 deg)

There is a 1 sigma uncertainty interval of  ± 0.24 path widths.
The probabilities to see a positive event:

Centre line: ~  96 %
Path limits: ~  50 %
1 sigma lines:  ~ 16 %
2 sigma lines: ~ 2 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0412_511_26172.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110412_26172_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20April.htm

Good luck with your observation!

Oliver Klös
IOTA-ES

(511) Davida, 2011 April 12, Station Map

Sonntag, April 3rd, 2011

Station Map for the Occultation by (85) Io at Thursday, 2011 April 07 (~ 23:27 UT)

Magnitude of target star 2UCAC 27306564: 13.2 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.7 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 11.7 mag (the magnitude of the asteroid).

The max duration is expected to be 20.6 sec with a max drop of 0.24 mag only.
The event will take place at an altitude of 24 deg and at azimuth 142 deg. The sun will be at an altitude of -37 deg. (At predicted centre line for longitude 0 deg)

There is a 1 sigma uncertainty interval of  ± 0.62 path widths.
The probabilities to see a positive event:

Centre line: ~  58 %
Path limits: ~  45 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0407_85_25971.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110407_25971_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(85) Io, 2011 April 07, Station Map