IOTA-ES : Call for Observations

Station Maps for the Occultation by (436) Patricia at Monday, 2009 February 09 (~ 22:47 UT)

WEST and EAST

V-Magnitude of target star HIP 34278: 11.3 mag
Johnson B-V Colour Index: + 0.6
The UCAC2 gives a “pseudo-R magnitude” of  10.8 mag

The max duration is expected to be 5.3 sec with a max drop of  3.6 mag.
The event will take place at an altitude of 71 deg and at azimuth 263 deg. The sun will be at an altitude of -54 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.81 path widths.
The probabilities to see a positive event:

Centre line: ~  46 %
Path limits: ~  39 %
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/2009_02/0209_436_17246.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20090209_17246_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s data):
http://astrosurf.com/eaon/Occultations%20February.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (187) Lamberta at Sunday, 2009 February 08 (~ 01:57 UT)

Magnitude of target star 2UCAC 28028576: 13.3 mag

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 12.1 mag (the magnitude of the asteroid).

The max duration is expected to be 9.0 sec with a max drop of  0.3 mag.
The event will take place at an altitude of 22 deg and at azimuth 151 deg. The sun will be at an altitude of - 38 deg. (At predicted centre line for longitude E 20 deg)

There is a 1 sigma uncertainty interval of  ±  0.84 path widths.
The probabilities to see a positive event:

Centre line: ~  45 %
Path limits: ~  38 %
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/2009_02/0208_187_19885.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20090208_19885_Sites.txt

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (105) Artemis at Tuesday, 2009 February 03 (~ 19:53 UT)

Magnitude of target star 2UCAC 29228009: 13.5 mag

The max duration is expected to be 10.4 sec with a max drop of  0.49 mag only..
The event will take place at an altitude of 32 deg and at azimuth 153 deg. The sun will be at an altitude of - 29 deg. (At predicted centre line for longitude 0 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/2009_02/0203_105_19871.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20090203_19871_Sites.txt

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (1632) Siebohme at Tuesday, 2009 February 03 (~ 18:35 UT)

V-Magnitude of target star TYC 0634-00848-1: 10.4 mag
Johnson B-V Colour Index: + 0.4
The UCAC2 gives a “pseudo-R magnitude” of 10.3 mag

The max duration is expected to be 1.2 sec with a max drop of  6.1 mag.
The event will take place at an altitude of 55 deg and at azimuth 213 deg. The sun will be at an altitude of - 15 deg. (At predicted centre line for longitude 0 deg)

There is a 1 sigma uncertainty interval of  ±  2.30 path widths.
The probabilities to see a positive event:

Centre line: ~  17 %
Path limits: ~  17 %
1 sigma lines:  ~ 8 %
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/2009_02/0203_1632_18820.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20090203_18820_Sites.txt

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

Good luck with your observation!

Oliver Klös

IOTA-ES