Light curve (dialog)¶
The “Light curve” dialog is used to make a light curve of an object. The light curve is common output of the reduction of CCD frame.
Activating the dialog¶
The dialog can be activated:
- from the main menu: .
- from the main toolbar:
The “Plot light curve” dialog appears. Check the options. Fill in the object coordinates and the observer coordinates, if necessary. Confirm the dialog.
Light curve dialog¶

Light curve
(1) The actual data set is shown here.
(2) You can switch the labels on the X axis between Julian date (JD) or date and time (UTC).
(3) It is also possible to switch between apertures.
(4) The list of available data sets is displayed here.
Data sets¶
Depending on the type of the light curve and the status of the options, the following data sets are available:
Differential magnitudes
- V-C - Differential magnitude of the variable star w.r.t. the comparison star
- V-Kn - Differential magnitude of the variable star w.r.t. the n-th check star
- C-Kn - Differential magnitude of the comparison star w.r.t. the n-th check star
Ensemble photometry
- V-C - Differential magnitude of the variable star w.r.t. the artificial comparison star
- V-Kn - Differential magnitude of the variable star w.r.t. the n-th check star
- Cm-Kn - Differential magnitude of the m-th comparison star w.r.t. the n-th check star
Instrumental magnitudes
- V - Instrumental magnitude of the variable star
- C - Instrumental magnitude of the comparison star
- Kn - Instrumental magnitude of the n-th check star
All stars (differential)
- IDnnn-C - Differential magnitude of the object with ID = nnn w.r.t. the comparison star
All stars (instrumental)
- IDnnn - Instrumental magnitude of the object with ID = nnn
Auxilliary data sets
The following data sets are optional:
- HELCOR - The heliocentric correction; in days
- AIRMASS - The air mass coefficient
- ALTITUDE - The apparent altitude in degrees; positive values above the horizon, negative values below the horizon
Statistics¶
The Statistics is a tool that computes and shows the minimum, maximum, sample mean and standard deviation.
To activate the tool:
- From the local menu, select . A new panel on the right side of the preview window appears.
If no points are selected, all points in the data set are included in the computation. To restrict the data for the statistics, press and hold the Shift key and draw a rectangle in a graph while you keep the left mouse button pressed down.
Measurement¶
The Measurement tool displays two cursors in the graph. The cursors can be adjusted by dragging them using the left mouse button. The position of each cursor, their distance and statistics for the data between cursors is presented.
To activate the tool:
From the local menu, select
. A new panel on the right side of the preview window appears.Measurement tool
(1) Choose the axis you want to measure.
(2) Positions of the cursor 1 and 2 are displayed here.
(3) Distance between cursor 1 and 2.
(4) When cursors are defined on the independent (X) axis, number of points (frames) between cursor 1 and 2 are displayed and also minimum, maximum, mean value and sample deviation are presented.