IOTA-ES : Call for Observations

Station Maps for the Occultation by (22) Kalliope and its Satellite Linus at Tuesday, 2011 November 22 (~ 02:39 UT)

Magnitude of target star 2UCAC 42217550 : 10.8 mag
UCAC instrumental “pseudo-R” fit-model magnitude: 10.8 mag (data from UCAC3)

(22) Kalliope:
The max duration is expected to be 25.4 sec with a max drop of 0.7 mag.
The event will take place at an altitude of 69 deg and at azimuth 212 deg. The sun will be at an altitude of -39 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.27 path widths.
The probabilities to see a positive event:

Centre line: ~ 88 %
Path limits: ~ 50 %
1 sigma lines:  ~ 16 %
2 sigma lines: ~ 2 %

Linus:
The max duration is expected to be 4.3 sec with a max drop of 0.6 mag.
The event will take place at an altitude of 73 deg and at azimuth 189 deg. The sun will be at an altitude of -45 deg. (At predicted centre line for longitude 0 deg)

There is a 1 sigma uncertainty interval of  ± 2.11 path widths.
The probabilities to see a positive event:

Centre line: ~ 19 %
Path limits: ~ 18 %
1 sigma lines:  ~ 9 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
(22) Kalliope:
http://asteroidoccultation.com/2011_11/1122_22_24271.htm

Linus:
http://asteroidoccultation.com/2011_11/1122_Linus_29104.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
(22) Kalliope:
http://www.poyntsource.com/New/Google/20111122_24271_Sites.txt

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

Good luck with your observation!

Oliver Klös
IOTA-ES

 Maps for (22) Kalliope:

Map for Linus:

Station Map for the Occultation by (248) Lameia at Monday, 2011 November 21 (~ 04:46 UT)

V-Magnitude of target star TYC 1342-01919-1: 10.5 mag
Spectral type: K5
Johnson B-V Colour Index: + 1.3
UCAC instrumental “pseudo-R” fit-model magnitude: 9.8 mag (data from UCAC3)

Trans-Atlantic-Event!
Path will cross SE U.S.A. and Mexico too!

The max duration is expected to be 10.5 sec with a max drop of 3.9 mag.
The event will take place at an altitude of 47 deg and at azimuth 244 deg. The sun will be at an altitude of -18 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.48 path widths.
The probabilities to see a positive event:

Centre line: ~ 70 %
Path limits: ~ 48 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1121_248_24267.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111121_24267_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (40) Harmonia at Monday, 2011 November 21 (~ 02:00 UT)

V-Magnitude of target star TYC 0644-00335-1: 11.1 mag
Johnson B-V Colour Index: + 0.6
UCAC instrumental “pseudo-R” fit-model magnitude: 11.0 mag (data from UCAC3)

Trans-Atlantic-Event!
Path will cross U.S.A. and Mexico too!

The max duration is expected to be 14.4 sec with a max drop of 0.24 mag.
The event will take place at an altitude of 37 deg and at azimuth 248 deg. The sun will be at an altitude of -50 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.17 path widths.
The probabilities to see a positive event:

Centre line: ~ 100 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1121_40_24266.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111121_24266_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (54) Alexandra at Monday, 2011 November 21 (~ 00:43 UT)

Magnitude of target star 2UCAC 43432380 : 12.7 mag
UCAC instrumental “pseudo-R” fit-model magnitude: 13.0 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.8 mag (the magnitude of the asteroid).

The max duration is expected to be 21.8 sec with a max drop of 0.8 mag.
The event will take place at an altitude of 66 deg and at azimuth 119 deg. The sun will be at an altitude of -55 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.45 path widths.
The probabilities to see a positive event:

Centre line: ~ 73 %
Path limits: ~ 49 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1121_54_28849.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111121_28849_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Minor Path Shift of Occultation by (266) Aline at Sunday, 2011 November 20

Steve Preston has calculated a minor path shift of ~ 14 km to the East (perpendicular to the path) at his prediction of Nov. 18th compared to the station map of Nov. 17th.

O.K.

Station Map for the Occultation by (266) Aline at Sunday, 2011 November 20 (~ 04:45 UT)

V-Magnitude of target star TYC 0769-01187-1: 11.4 mag
Johnson B-V Colour Index: + 0.5
UCAC instrumental “pseudo-R” fit-model magnitude: 11.4 mag (data from UCAC3)

The max duration is expected to be 14.4 sec with a max drop of 2.0 mag.
The event will take place at an altitude of 47 deg and at azimuth 212 deg. The sun will be at an altitude of -21 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.48 path widths.
The probabilities to see a positive event:

Centre line: ~ 70 %
Path limits: ~ 48 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1120_266_24263.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111120_24263_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (75) Eurydike at Saturday, 2011 November 19 (~ 21:59 UT)

Magnitude of target star 2UCAC 42391466 : 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 0.8 mag to 13.0 mag (the magnitude of the asteroid).

The max duration is expected to be 7.4 sec with a max drop of 0.8 mag.
The event will take place at an altitude of 41 deg and at azimuth 85 deg. The sun will be at an altitude of -62 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 1.70 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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1119_75_28845.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111119_28845_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (1867) Deiphobus at Thursday, 2011 November 17 (~ 17:18 UT)

V-Magnitude of target star TYC 0539-01224-1: 10.2 mag
Spectral type: F8
Johnson B-V Colour Index: + 0.5
UCAC instrumental “pseudo-R” fit-model magnitude: 10.0 mag (data from UCAC3)

The max duration is expected to be 9.2 sec with a max drop of 5.8 mag.
The event will take place at an altitude of 44 deg and at azimuth 193 deg. The sun will be at an altitude of -17 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.76 path widths.
The probabilities to see a positive event:

Centre line: ~ 49 %
Path limits: ~ 41 %
1 sigma lines:  ~ 15 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1117_1867_24254.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111117_24254_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (2067) Aksnes at Wednesday, 2011 November 16 (~ 21:47 UT)

V-Magnitude of target star TYC 5812-01158-1: 10.6 mag
Johnson B-V Colour Index: + 0.6
UCAC instrumental “pseudo-R” fit-model magnitude: 10.3 mag (data from UCAC3)

The max duration is expected to be 8.5 sec with a max drop of 6.4 mag.
The event will take place at an altitude of 14 deg and at azimuth 232 deg. The sun will be at an altitude of -51 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 2.06 path widths.
The probabilities to see a positive event:

Centre line: ~ 19 %
Path limits: ~ 19 %
1 sigma lines:  ~ 9 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_11/1116_2067_24251.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111116_24251_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

Station Map for the Occultation by (272) Antonia at Wednesday, 2011 October 05 (~ 04:37 UT)

V-Magnitude of target star TYC 0645-00211-1: 11.3 mag
Johnson B-V Colour Index: + 0.8
UCAC instrumental “pseudo-R” fit-model magnitude: 11.1 mag (data from UCAC3)

Trans-Atlantic Event!
Path will cross SE Canada and U.S.A. too.

The max duration is expected to be 3.1 sec with a max drop of 3.6 mag.
The event will take place at an altitude of 37 deg and at azimuth 245 deg. The sun will be at an altitude of -11 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 1.73 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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_10/1005_272_24118.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20111005_24118_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES