Archive for September, 2011

Donnerstag, September 22nd, 2011

Station Maps for the Occultation by (912) Maritima at Sunday, 2011 September 25 (~ 03:51 UT)

WEST and EAST

V-Magnitude of target star TYC 2447-00490-1: 9.9 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 9.1 mag (data from UCAC3)

The max duration is expected to be 3.5 sec with a max drop of 3.8 mag.
The event will take place at an altitude of 62 deg and at azimuth 102 deg. The sun will be at an altitude of -17 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.50 path widths.
The probabilities to see a positive event:

Centre line: ~ 68 %
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_09/0925_912_24073.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110925_24073_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(912) Maritima, 2011 September 25, Station Map WEST(912) Maritima, 2011 September 25, Station Map EAST

Donnerstag, September 22nd, 2011

Station Map for the Occultation by (1036) Ganymed at Sunday, 2011 September 25 (~ 02:46 UT)

V-Magnitude of target star TYC 3670-00426-1: 11.4 mag
Johnson B-V Colour Index: + 1.1
UCAC instrumental „pseudo-R“ fit-model magnitude: 11.0 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 9.3 mag (the magnitude of the asteroid).

OCCULTATION BY A NEA (Near Earth Asteroid)!
There are more occultations to come in the next months crossing Europe!
Have a look for future events at the special webpage:
http://www.iota-es.de/ganymed_2011.html

The max duration is expected to be 3.0 sec with a max drop of 0.15 mag.
The event will take place at an altitude of 72 deg and at azimuth 289 deg. The sun will be at an altitude of -24 deg. (At predicted centre line for latitude N 52 deg 6min)

There is a 1 sigma uncertainty interval of  ± 0.44 path widths.
The probabilities to see a positive event:

Centre line: ~ 74 %
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_09/0925_1036_24072.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110925_24072_Sites.txt

Good luck with your observation!

Oliver Klös

IOTA-ES

(1036) Ganymed, 2011 September 25, Station Map

Sonntag, September 18th, 2011

Station Map for the Occultation by (429) Lotis at Wednesday, 2011 September 21 (~ 02:52 UT)

V-Magnitude of target star TYC 1319-01856-1: 11.5 mag
Johnson B-V Colour Index: + 0.0
UCAC instrumental „pseudo-R“ fit-model magnitude: 11.1 mag (data from UCAC3)

The max duration is expected to be 3.2 sec with a max drop of 3.2 mag.
The event will take place at an altitude of 45 deg and at azimuth 113 deg. The sun will be at an altitude of -23 deg. (At predicted centre line for longitude E 15 deg)

There is a 1 sigma uncertainty interval of  ± 0.70 path widths.
The probabilities to see a positive event:

Centre line: ~ 53 %
Path limits: ~ 42 %
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_09/0921_429_24061.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110921_24061_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(429) Lotis, 2011 September 21, Station Map

Sonntag, September 18th, 2011

Station Map for the Occultation by (895) Helio at Tuesday, 2011 September 20 (~ 18:11 UT)

V-Magnitude of target star TYC 2764-01038-1: 12.5 mag
Johnson B-V Colour Index: + 0.9
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.1 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.2 mag (the magnitude of the asteroid).

The max duration is expected to be 11.7 sec with a max drop of 1.2 mag.
The event will take place at an altitude of 44 deg and at azimuth 83 deg. The sun will be at an altitude of -12 deg. (At predicted centre line for longitude E 15 deg)

There is a 1 sigma uncertainty interval of  ± 0.47 path widths.
The probabilities to see a positive event:

Centre line: ~ 71 %
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_09/0920_895_24059.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110920_24059_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(895) Helio, 2011 September 20, Station Map