<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Column label: TELESCOP</TITLE> <META NAME="description" CONTENT="Column label: TELESCOP"> <META NAME="keywords" CONTENT="vol2"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol2.css"> <LINK REL="next" HREF="node571.html"> <LINK REL="previous" HREF="node569.html"> <LINK REL="up" HREF="node569.html"> <LINK REL="next" HREF="node571.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html8647" HREF="node571.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html8644" HREF="node569.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html8638" HREF="node569.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html8646" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html8648" HREF="node571.html">Column label: DIAM</A> <B> Up:</B> <A NAME="tex2html8645" HREF="node569.html">Permanent telescope parameters</A> <B> Previous:</B> <A NAME="tex2html8639" HREF="node569.html">Permanent telescope parameters</A> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION003231000000000000000"> Column label: TELESCOP</A> </H2> <P> This is the name of the telescope focus, using the standard ESO archive notation [<A HREF="node649.html#E92">5</A>]. The name begins with an abbreviation for the telescope's governing organization. The next part of the name is the aperture in decimeters (preceded by letters A, B, etc. if there are multiple telescopes with similar apertures). The name ends with the suffix P for prime focus, A for Cassegrain focus, C for coudé, and N<I>x</I> for Nasmyth foci. <P> Thus, for example, the Cassegrain focus of the ESO 1.5-meter telescope is designated ESO15A. But this telescope has an asymmetrical mounting that is difficult to switch from one side of the pier to the other. In this case, it is necessary to operate on one side only during the night; this is indicated by appending the letter E or W to show which side of the pier the telescope is actually used on. So, for the 1.5-m telescope used east of the pier, the designation of the Cassegrain focus is ESO15AE. <P> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
