ESTIMATED DATES OF FUTURE SOHO KEYHOLES Note: These dates may change slightly and are only to be taken as guidelines for e.g. scheduling of observing campaigns etc. Please contact the SOHO Science Operations Coordinators in case you have questions. In general, for each keyhole, data losses will almost certainly occur between the last and first full days of high rate on 34m stations (i.e. the "34m keyholes"). Data losses are less likely (but cannot be excluded) in the adjacent "26m keyholes" (between last full day of high rate on 26m and last full day of high rate on 34m, and first full day of high rate on 34m and first full day of high rate on 26m). Note: DSN decommissioned its last 26m antenna in early August 2009. On 14 August the SOHO High-Gain Antenna (HGA) Z-axis was successfully moved from -18.55 to -16.7 degrees to shorten the keyhole durations. Since no 26m antennae are used any more, the previous 26m keyhole period is now in effect "DSS-27 keyhole". [------ 34m keyhole ------] Last FULL DAY Last day First day First FULL DAY w/high rate 26m w/high rate 34m w/high rate 34m w/high rate 26m -------------------------------------------------------------------------- 2004 15-Mar-04 19-Mar-04 03-Apr-04 07-Apr-04 16-Jun-04 19-Jun-04 30-Jun-04 03-Jul-04 12-Sep-04 17-Sep-04 01-Oct-04 05-Oct-04 12-Dec-04 16-Dec-04 26-Dec-04 30-Dec-04 -------------------------------------------------------------------------- 2005 02-Mar-05 10-Mar-05 24-Mar-05 01-Apr-05 05-Jun-05 09-Jun-05 20-Jun-05 25-Jun-05 30-Aug-05 06-Sep-05 22-Sep-05 29-Sep-05 02-Dec-05 06-Dec-05 17-Dec-05 21-Dec-05 -------------------------------------------------------------------------- 2006 21-Feb-06 28-Feb-06 16-Mar-06 22-Mar-06 26-May-06 31-May-06 11-Jun-06 15-Jun-06 20-Aug-06 28-Aug-06 13-Sep-06 20-Sep-06 23-Nov-06 27-Nov-06 08-Dec-06 12-Dec-06 -------------------------------------------------------------------------- 2007 12-Feb-07 19-Feb-07 06-Mar-07 13-Mar-07 17-May-07 21-May-07 01-Jun-07 06-Jun-07 10-Aug-07 18-Aug-07 03-Sep-07 10-Sep-07 14-Nov-07 18-Nov-07 29-Nov-07 03-Dec-07 -------------------------------------------------------------------------- 2008 03-Feb-08 10-Feb-08 25-Feb-08 03-Mar-08 06-May-08 10-May-08 22-May-08 26-May-08 31-Jul-08 07-Aug-08 23-Aug-08 31-Aug-08 04-Nov-08 08-Nov-08 19-Nov-08 23-Nov-08 -------------------------------------------------------------------------- 2009 24-Jan-09 31-Jan-09 15-Feb-09 22-Feb-09 27-Apr-09 01-May-09 13-May-09 17-May-09 21-Jul-09 28-Jul-09 14-Aug-09 21-Aug-09 29-Oct-09 31-Oct-09 08-Nov-09 11-Nov-09 -------------------------------------------------------------------------- 2010 20-Jan-10 24-Jan-10 04-Feb-10 08-Feb-10 21-Apr-10 23-Apr-10 02-May-10 04-May-10 17-Jul-10 21-Jul-10 02-Aug-10 07-Aug-10 19-Oct-10 22-Oct-10 30-Oct-10 02-Nov-10 -------------------------------------------------------------------------- 2011 11-Jan-11 15-Jan-11 26-Jan-11 30-Jan-11 12-Apr-11 14-Apr-11 22-Apr-11 25-Apr-11 07-Jul-11 12-Jul-11 23-Jul-11 28-Jul-11 10-Oct-11 13-Oct-11 21-Oct-11 23-Oct-11 -------------------------------------------------------------------------- 2012 02-Jan-12 06-Jan-12 17-Jan-12 21-Jan-12 01-Apr-12 04-Apr-12 12-Apr-12 15-Apr-12 26-Jun-12 01-Jul-12 12-Jul-12 17-Jul-12 30-Sep-12 03-Oct-12 10-Oct-12 13-Oct-12 23-Dec-12 27-Dec-12 07-Jan-13 11-Jan-13 -------------------------------------------------------------------------- 2013 20-Mar-13 24-Mar-13 04-Apr-13 08-Apr-13 12-Jun-13 19-Jun-13 06-Jul-13 13-Jul-13 17-Sep-13 22-Sep-13 03-Oct-13 07-Oct-13 09-Dec-13 18-Dec-13 01-Jan-14 08-Jan-14 -------------------------------------------------------------------------- 2014 11-Mar-14 15-Mar-14 26-Mar-14 30-Mar-14 02-Jun-14 09-Jun-14 26-Jun-14 04-Jul-14 08-Sep-14 12-Sep-14 23-Sep-14 27-Sep-14 30-Nov-14 07-Dec-14 23-Dec-14 30-Dec-14 -------------------------------------------------------------------------- 2015 02-Mar-15 06-Mar-15 17-Mar-15 21-Mar-15 24-May-15 31-May-15 16-Jun-15 24-Jun-15 -------------------------------------------------------------------------- Revision 20