calibration

Data Release 10 is now available.

Through a grant from the Robert Martin Ayers Sciences Fund, the AAVSO is performing an all-sky photometric survey. This survey is conducted in eight filters: Johnson B and V, plus Sloan u', g′, r′, i′, z_s and Z. It is valid from about 7th magnitude to about 17th magnitude.

Welcome to the AAVSO's Research Portal.  From this page, you can find information about obtaining AAVSO data, requesting new observations, or learning more about the AAVSO, its data, and its services for the research community.  Its purpose is to facilitate your use of the AAVSO's resources in your research efforts.

See the blue boxes on the right hand side of this page to access the AAVSO data archives or to find out  how to work with the AAVSO to obtain new scientific data.

This information was originally published as a series of reports by AAVSO observer Doug West in 2003, outlining his experiments and calibrations of the Optec SSP-4 infrared photometer

• Report 1 (Initial testing)
• Report 2 (SNR testing)
• Report 3 (Transformation)
• Report 4 (Observations)

SSP-4 Photometer Observation Report and Analysis #1

By Doug West
16 May 2003

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET:  aavso@cfa     SPAN:  cfa::aavso
INTERNET:  aavso@cfa.harvard.edu
Tel. 617-354-0484       FAX 617-354-0665

AAVSO ALERT NOTICE 196 (January 12, 1995)

OUTBURST OF 2110+13 EF PEGASI

A number of papers have been written discussing visual magnitude estimates in comparison to photometry.  Multiple studies have shown that visual magnitude estimates compare very favorably with instrumental photometry in terms of sensitivity and consistency.  As with all data, care must be taken to understand what visual magnitude estimates represent, what their bandpass is, and when their use is appropriate.

Photographers sometimes include a color chart in their photographs. The chart helps them get proper color balance in the final prints.