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Subject: Re: [vsnet-unknown 169] Re: [vsnet-chat 6714] Query object by Cucarella From: Anton_Paschke@swissre.com Date: Mon, 21 Jul 2003 10:56:04 +0200 Dear prof Kato, > I would carefully examine the discrepant image and see if the >unusual object has the same seeing profile as other stars in the >frame. On the first glance (just looking on the GIF images) I have the impression, that the object has the same shape as stars. Of course, a closer examination should be done. But basicaly there are two alternatives: the spot is caused by light, that passed trough the telescope optics or it is caused by cosmic ray impact on the chip. I have observed similar cases too. I believe, that they were abundant in nights when the weather changed and stars began to faint behind thin clouds. ( Only my guess, no statistics, no proof) It could be an pointlike electric discharge in the atmosphere. Once I discussed the subject with my former colegues on the institute of the physics of the atmosphere here on the Swiss Federal Technology Institute, but we came to no firm conclusion. One or two spoiled ccd images are not sufficient data for deeper research. with best regards Anton Paschke This e-mail, including attachments, is intended for the person(s) or company named and may contain confidential and/or legally privileged information. Unauthorized disclosure, copying or use of this information may be unlawful and is prohibited. If you are not the intended recipient, please delete this message and notify the sender
Return to the Powerful Daisaku Nogami
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