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CALL FOR OBSERVATION

Occultations by Near Earth Asteroid 1036 Ganymed for 2011

Dear IOTA Members,

This year sees a favorable apparition for 1036 Ganymed, a near -Earth Asteroid (NEA) which, at 40 km diameter, the largest known of its class. The object is expected to become as bright as 8th magnitude in October and November. Steve Preston has posted path predictions for 39 occultations of stars by this asteroid that will occur between the end of this month (April) and the end of the year. This presents an opportunity to characterize this large NEA. In particular, it may be possible to produce a combined shape and ephemeris solution of the asteroid using a large number of occultation chords, lightcurves, and astrometry of the asteroid and the stars to be occulted. Radar observations are also expected to take place at opposition near the end of the year.

In support of this effort, we would like to issue a call for observations of as many of these occultations as possible and also astrometry and Ganymed and the target stars. A list of predictions is provided below along with the geographical region where the occultation occurs. Currently, the uncertainty in most of the occultation paths is of the order of the path itself, ie it is good given the relatively small size of the asteroid but it can be better. The predicted occultations are short, 1-4 sec in duration and the flux drop is typically about a magnitude. The durations become longer and the flux drop smaller as the asteroid approaches the Earth in the Autumn. For these reasons, video or drift scan observations are preferred over the visual method. Also, please note that the predictions will be refined as time passes so be sure to check the latest predictions before setting off on a trip to observe an occultation. Hopefully, this call will result in a sufficient critical mass of observations for a dedicated publication.

Clear Skies and Good Luck!

Apostolos Christou

Jan Manek

Steve Preston

April 2011

SE Australia

http://www.asteroidoccultations.com/2011_04/0423_1036_26004.htm


May 2011

W Europe

http://www.asteroidoccultations.com/2011_05/0516_1036_26040.htm

SE Australia

http://www.asteroidoccultations.com/2011_05/0521_1036_26047.htm

Australia

http://www.asteroidoccultations.com/2011_05/0521_1036_26049.htm

Eastern USA & Canada

http://www.asteroidoccultations.com/2011_05/0523_1036_26052.htm

Europe

http://www.asteroidoccultations.com/2011_05/0530_1036_26072.htm

Eastern USA & Canada

http://www.asteroidoccultations.com/2011_05/0530_1036_26073.htm


June 2011

Indonesia, Australia

http://www.asteroidoccultations.com/2011_06/0612_1036_26092.htm

Eastern USA & Canada

http://www.asteroidoccultations.com/2011_06/0615_1036_26099.htm

UK, Europe, Africa

http://www.asteroidoccultations.com/2011_06/0616_1036_26105.htm

Eastern USA & Canada

http://www.asteroidoccultations.com/2011_06/0618_1036_25136.htm

Indonesia, W Australia

http://www.asteroidoccultations.com/2011_06/0624_1036_26122.htm

Indonesia, E Australia

http://www.asteroidoccultations.com/2011_06/0626_1036_26124.htm


July 2011

S Europe, NW Africa

http://www.asteroidoccultations.com/2011_07/0716_1036_23893.htm

Japan, Indonesia

http://www.asteroidoccultations.com/2011_07/0716_1036_23894.htm

SE Asia

http://www.asteroidoccultations.com/2011_07/0716_1036_23895.htm

Germany, Austria, Italy, N africa

http://www.asteroidoccultations.com/2011_07/0723_1036_23915.htm

NE China, S Japan

http://www.asteroidoccultations.com/2011_07/0728_1036_23924.htm


August 2011

W Asia, Turkey, S Greece, Africa

http://www.asteroidoccultations.com/2011_08/0802_1036_23929.htm

W Asia, Turkey, S Greece, Africa

http://www.asteroidoccultations.com/2011_08/0802_1036_24664.htm

Europe

http://www.asteroidoccultations.com/2011_08/0806_1036_23940.htm

China, India

http://www.asteroidoccultations.com/2011_08/0818_1036_23965.htm

Europe

http://www.asteroidoccultations.com/2011_08/0826_1036_23980.htm

USA, Mexico

http://www.asteroidoccultations.com/2011_08/0828_1036_23983.htm


September 2011

N USA, S Canada

http://www.asteroidoccultations.com/2011_09/0902_1036_24000.htm

USA, Mexico

http://www.asteroidoccultations.com/2011_09/0903_1036_24005.htm

Canada, NW USA

http://www.asteroidoccultations.com/2011_09/0907_1036_24020.htm

NE Asia, N Japan

http://www.asteroidoccultations.com/2011_09/0910_1036_24027.htm

USA, Mexico (morning twilight)

http://www.asteroidoccultations.com/2011_09/0917_1036_24050.htm

Europe, Africa

http://www.asteroidoccultations.com/2011_09/0925_1036_24072.htm

Europe, Africa

http://www.asteroidoccultations.com/2011_09/0928_1036_24086.htm


October 2011

S Asia, Indonesia

http://www.asteroidoccultations.com/2011_10/1001_1036_24105.htm

N Europe, W Asia, Middle East

http://www.asteroidoccultations.com/2011_10/1001_1036_24106.htm

Russia, Mongolia, China, Indonesia, Australia

http://www.asteroidoccultations.com/2011_10/1006_1036_25299.htm

Canada, NE USA, S America

http://www.asteroidoccultations.com/2011_10/1007_1036_24124.htm

S Japan, Indonesia,

http://www.asteroidoccultations.com/2011_10/1007_1036_24128.htm

E Russia, S Japan, Indonesia

http://www.asteroidoccultations.com/2011_10/1008_1036_24132.htm


November 2011

N & E Europe, Turkey, Africa

http://www.asteroidoccultations.com/2011_11/1102_1036_24196.htm

Canada, W USA

http://www.asteroidoccultations.com/2011_11/1120_1036_24264.htm