diff --git a/tleupdate b/tleupdate
index 3499e1b..dd61f91 100755
--- a/tleupdate
+++ b/tleupdate
@@ -11,27 +11,30 @@ cd $ST_TLEDIR
 # Get date
 DATE=`date +%Y%m%d_%H%M%S`
 
-# Get cookie
-wget --post-data=$ST_LOGIN --cookies=on --keep-session-cookies --save-cookies=/tmp/cookies.txt 'https://www.space-track.org/ajaxauth/login' -o /tmp/stget.log
+# Get space-track catalog
+if [[ ! -z "${ST_LOGIN}" ]]; then
+    # Get cookie
+    wget --post-data=$ST_LOGIN --cookies=on --keep-session-cookies --save-cookies=/tmp/cookies.txt 'https://www.space-track.org/ajaxauth/login' -o /tmp/stget.log
 
-# Get data
-wget  --keep-session-cookies --load-cookies=/tmp/cookies.txt 'https://www.space-track.org/basicspacedata/query/class/tle_latest/ORDINAL/1/EPOCH/%3Enow-30/format/3le' -O catalog.tle
-dos2unix catalog.tle
+    # Get data
+    wget  --keep-session-cookies --load-cookies=/tmp/cookies.txt 'https://www.space-track.org/basicspacedata/query/class/tle_latest/ORDINAL/1/EPOCH/%3Enow-30/format/3le' -O catalog.tle
+    dos2unix catalog.tle
 
-# Determine if we have gsed on our system, which probably means that the regular 'sed'
-# is BSD sed, which has a differnet syntax. Use GNU sed instead...
-gsed_exists=$(which gsed)
-if [ -n "$gsed_exists" ]; then
+    # Determine if we have gsed on our system, which probably means that the regular 'sed'
+    # is BSD sed, which has a differnet syntax. Use GNU sed instead...
+    gsed_exists=$(which gsed)
+    if [ -n "$gsed_exists" ]; then
 	SED=gsed
 	echo "Using GSED"
-else
+    else
 	SED=sed
-fi
+    fi
 
-# Fix missing leading zeros
-$SED -i -e "s/^1     /1 0000/g" -e "s/^2     /2 0000/g" -e "s/^1    /1 000/g" -e "s/^2    /2 000/g" -e "s/^1   /1 00/g" -e "s/^2   /2 00/g" -e "s/^1  /1 0/g" -e "s/^2  /2 0/g" catalog.tle
-cp catalog.tle ${DATE}_catalog.txt
-rm login
+    # Fix missing leading zeros
+    $SED -i -e "s/^1     /1 0000/g" -e "s/^2     /2 0000/g" -e "s/^1    /1 000/g" -e "s/^2    /2 000/g" -e "s/^1   /1 00/g" -e "s/^2   /2 00/g" -e "s/^1  /1 0/g" -e "s/^2  /2 0/g" catalog.tle
+    cp catalog.tle ${DATE}_catalog.txt
+    rm login
+fi
 
 # Get classfd
 wget http://www.prismnet.com/~mmccants/tles/classfd.zip --no-check-certificate -O classfd.zip