Archive for August, 2011

Samstag, August 6th, 2011

Station Maps for the Occultation by (372) Palma at Wednesday, 2011 August 10 (~ 22:09 UT)

NORTH and SOUTH

Magnitude of target star 2UCAC 42524779: 13.3 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.3 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 12.2 mag (the magnitude of the asteroid).

The max duration is expected to be 12.4 sec with a max drop of 0.34 mag.
The event will take place at an altitude of 29 deg and at azimuth 75 deg. The sun will be at an altitude of -25 deg. (At predicted centre line for longitude E 11 deg 3 min)

There is a 1 sigma uncertainty interval of  ± 0.59 path widths.
The probabilities to see a positive event:

Centre line: ~ 60 %
Path limits: ~ 45 %
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_08/0810_372_28542.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110810_28542_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES

(372) Palma, 2011 August 10, Station Map NORTH(372) Palma, 2011 August 10, Station Map SOUTH

Freitag, August 5th, 2011

Station Map for the Occultation by (1036) Ganymed at Saturday, 2011 August 06 (~ 22:50 UT)

V-Magnitude of target star TYC 4264-01166-1: 12.2 mag
Johnson B-V Colour Index: + 0.4
UCAC instrumental „pseudo-R“ fit-model magnitude: 11.6 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 10.5 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 3.6 sec with a max drop of 0.21 mag.
The event will take place at an altitude of 71 deg and at azimuth 36 deg. The sun will be at an altitude of -26 deg. (At predicted centre line for longitude E 17 deg)

There is a 1 sigma uncertainty interval of  ± 0.65 path widths.
The probabilities to see a positive event:

Centre line: ~ 54 %
Path limits: ~  44 %
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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_08/0806_1036_23940.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110806_23940_Sites.txt

Good luck with your observation!

Oliver Klös

IOTA-ES

(1036) Ganymed, 2011 August 06, Station Map