The Facilities Summary (FACSUM) display is an informational widget providing the current telescope status (pointing, date, guiding, focus, etc.). FACSUM is a monitor program and offers no controls. Below is a description of the information items located on the FACSUM widget.

To start FACSUM, right click on a blue background desktop in your VNC session and from the popup menu select, depending on the instrument:

K2 Telescope Status Menu → FACSUM


Telescope GUIs → FACSUM

Stop FACSUM by using the Close option from the window menu, accessible by clicking the button at the top left of the window.

FACSUM: Typical status during a slew.

Status Indicators
Name Description Indicators
Telescope Telescope Status Tracking
Not Controlling
No Status
Mirror Active Control System Status Running
No Status
Guider Guiding status Guiding
Not Guiding
No Status
Dome Dome status Tracking
In Position
No Status
Rotator Instrument Rotator Status Tracking
No Status
FocalStn Focal Station N/A
Information Fields
Name Description
LST Gives the Local Siderial Time. This corresponds to the Right Ascension currently crossing the meridian.
UT Universal Date and Time (note: 10 hours ahead of HST)
Target Name of the target as given in the starlist. The target will read slewing when moving to an object. Note: The target name is written in white above the base coordinates, and there is not label.
Base Coordinates RA (α) and Dec (δ) to which the telescope was originally pointed. Due to tweaks required to center objects, atmospheric dispersion, etc., this will tend to differ from the current coordinates.
Current coordinates RA (α) and Dec (δ) now lying at the selected pointing origin.
Offset These numbers, lying below the current coordinates indicate the offsets between the base and current coordinates. [arcsec]
Equinox Equinox of the coordinate system. [years]
Time to
limit (h)
Time remaining until this target will become inaccessible due to either telescope constraints (Tel) or rotator constraints (Rot).
El Current telescope altitude angle. [degrees]
Az Azimuth angle of the telescope. [degrees]
Dome Azimuth angle of the dome. [degrees]
TopShut Angle of the dome top shutter. [degrees]
BotShut Angle of the dome bottom shutter. [degrees]
HA Hour angle. The difference between the LST and the RA, this gives a measure of how long until (or since) the object crosses the meridian.
Airmass The number of airmasses lying along the path to the target. When overhead, the value is 1.
Focus Position of the secondary mirror piston, a gross measure of focus. [mm]
INST Current operating instrument
PO Current selected pointing origin (see the pointing origins documentation )
CA, CE Pointing model parameters for the Azimuth and Elevation axes
Rot Mode Current operating mode of the rotator. Options are: Stationary, Position angle, Vertical
Sky PA Position angle of the instrument relative to celestial North. [degrees]
Drive Physical rotator angle. [degrees]
ACS Move M1 Active Control System moves. [nm]
Sens Res M1 edge sensor. [nm]
Sens Range M1 edge sensor range. [μm]