After the January 11, 2010 VLA correlator shut-down this page has become obsolete and will not be maintained any further. For EVLA observing using the new WIDAR correlator please refer to the new EVLA page, in particular the new version of this page.

VLA/EVLA Configuration Plans and Proposal Deadlines

The antennas in the Very Large Array are used like the zoom lens in a camera. When they are in the A configuration, the telescopes extend over the 21 kilometer (13 mile) length of each arm. This simulates a single dish that is 36 kilometers (22 miles) in diameter. In this configuration, we have the most magnification and can see the greatest detail. The size of the array gradually decreases with the B and C configurations until, in the D configuration, the telescopes are all placed within .6 kilometer (.4 mile) of the center. In the smaller configurations, scientists can study the overall structure of the source they are observing. By observing the same source in each configuration, scientists can gather a great deal more information.

The telescopes are moved about every four months. The configurations listed below with a lower-case "n", such as "DnC" and "BnA" are hybrid configurations in which the antennas on the east and west arms are moved in for the next configuration, but those on the north arm remain extended for a short time to enhance our view of sources in the southern sky.

VLA Configuration Plans for 2009
Observing Period
Configuration
Proposal Deadline
2009 Jan 23 - 2009 Feb 09
BnA
2008 Oct 1
2009 Feb 13 - 2009 May 18
B
2008 Oct 1
2009 May 29 - 2009 Jun 15
CnB
2009 Feb 2
2009 Jun 19 - 2009 Sep 14
C
2009 Feb 2
2009 Sep 25 - 2009 Oct 12
DnC
2009 Jun 1
2009 Oct 16 - 2010 Jan 11
D
2009 Jun 1

At the end of the VLA D configuration in 2010 Jan the VLA correlator will be turned off, and the VLA will not be available for an interval of up to 2 months while hardware is moved from the VLA correlator to the new correlator for the Expanded Very Large Array (EVLA). When observing resumes with the EVLA, it will be in the D configuration. For the EVLA, the order of the configurations will be: D, DnC, C, CnB, B, BnA, A. For more information on the EVLA, see the EVLA Observational Status Summary.

EVLA Configuration Plans for 2010-2012
Trimester
Observing Period
Configuration
Proposal Deadline
2010a
2010 Mar 01 - 2010 May 24
D
2009 Oct 1
2010a
2010 May 28 - 2010 Jun 14
DnC
2009 Oct 1
2010b
2010 Jun 25 - 2010 Sep 13
C
2010 Feb 1
2010b
2010 Sep 17 - 2010 Oct 04
CnB
2010 Feb 1
2010c
2010 Oct 15 - 2011 Jan 03
B
2010 Jun 1
2010c
2011 Jan 07 - 2011 Jan 24
BnA
2010 Jun 1
2011a
2011 Feb 04 - 2011 May 09
A
2010 Oct 1
2011b
2011 May 27 - 2011 Aug 15
D
2011 Feb 1
2011b
2011 Aug 19 - 2011 Sep 06
DnC
2011 Feb 1
2011c
2011 Sep 16 - 2011 Dec 12
C
2011 Jun 1
2011c
2011 Dec 16 - 2012 Jan 03
CnB
2011 Jun 1
2012a
2012 Jan 13 - 2012 Apr 16
B
2011 Oct 3
2012a
2012 Apr 20 - 2012 May 07
BnA
2011 Oct 3
2012b
2012 May 18 - 2012 Aug 27
A
2012 Feb 1
2012c
2012 Sep 14 - 2012 Dec 10
D
2012 Jun 1
2012c
2012 Dec 14 - 2012 Dec 31
DnC
2012 Jun 1

Modified on Tuesday, 24-Aug-2010 15:41:11 MDT by schedsoc