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From: jules@astro.columbia.edu
Subject: Predicting future visibility
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Date: Mon, 10 Dec 2012 22:49:47 GMT
From: jules@astro.columbia.edu
To: xmmhelp@sciops.esa.int
Cc: jules@astro.columbia.edu
Subject: Predicting future visibility
Full_Name: Jules Halpern
Submission from: (NULL) (128.59.168.156)


I am interested in a target whose visibility has been decreasing to almost
nothing in recent years.  I would like to know if it is possible to predict
if/when the visibility is going to increase again, lets say to 20 ks.

The coordinates are (J2000) 14 12 56. +79 22 04

Figure 120 of Section 4.2.3 Sky visibility during the XMM-Newton mission
is not designed precisely enough to make this calculation.



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From: Pedro M. Rodriguez Pascual <xmmhelp@sciops.esa.int>
To: jules@astro.columbia.edu
Subject: Re: Predicting future visibility (PR#51450)
Date: Tue Dec 11 09:18:15 2012
Hello,

Unfortunately, predictions for visibility on a timescale of several years are
not very accurate, specially for extreme cases close to the apparent path of
Earth as seen by XMM. With our current estimates for the orbit evolution, the
longest continuous visibility of your target will not be longer than 10ks before
2020.

Sincerely,

Pedro


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