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photoelectric photometry

PEPObs user guide

PEPObs was developed from legacy code used to reduce photoelectric photometry submitted to the AAVSO PEP program.  We have retained most of the original fields for backwards compatibility with old PEP reports.  What follows is a guide to  fields in the online form with formatting instructions.  In the examples, the quotes ("") should not be included.

PEP Newsletter v18n1

Message from the Editor

Once again, photoelectric photometry was well represented at the AAVSO Fall Meeting, held this year in Chicopee and South Hadley MA, with Tom Dennis and Ron Zissell as hosts.

PEP Newsletter v17n2

Photoelectric Photometry Newsletter, Vol. 17, No. 2
April 1997
J. Percy, editor


Long-term photometric campaign on the Luminous Blue Variable P Cygni

New: Preliminary results, 2010 November 4

The 2010 report by E. Pollman and T. Bauer is available from this link.  For the 2009 report, see this link

AAVSO Special Notice #131, November 7, 2008

List of target, comparison, and check stars for PEP-V observations

The link below contains the list of current stars in the PEP database.  V band observations of these stars may be reduced via the PEPObs web tool.  This list is also used by the BVI reduction spreadsheet.

Click here to obtain a comma-separated (.csv) list of PEP target, comparison, and check stars.  This file evolves over time.  The current version is as of October 3, 2020. A "Change Log" can be found here.

The format of the lines is as follows:

PEP Newsletter v22n1

Photoelectric Photometry Newsletter

Volume 22, No. 1, January 2003

Editor: John R. Percy

Contributions to this Newsletter are gratefully received at any time. Please send them to: John Percy, Erindale Campus, University of Toronto, Mississauga ON, Canada L5L 1C6; e-mail: All material in this Newsletter has been written by the Editor unless otherwise indicated.

SSP-4 Targets and Comparison Stars

SSP-4 Targets and Comparison Stars

Table 1 - SSP-4 Target List



Spectral Class

Var Type

Period (d)

Comparison Star, Check Star

PEP Newsletter v24n1; July 2006

Volume 24, Number 1; July 2006

Editor: John R. Percy

PEP Newsletter

Photoelectric Photometry Newsletters

The Photoelectric Photometry Newsletter is no longer issued as a separate AAVSO publication. Beginning in August 2008, articles on photoelectric photometry are now included in the AAVSO Newsletter.

Past issues:

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