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comparison stars

Special Notice #387: EE Cep eclipse and comparison stars

July 24, 2014:The eclipse of EE Cep (AAVSO Alert Notice 502) appears to be gradually beginning, according to observations in the AAVSO International Database. Please observe this system according to the instructions given in the Alert Notice.

Special Notice #373: Comparison star changed for HD 15407A

October 24, 2013: HD 15407A is one of the targets in the current observing campaign by Huan Meng and Dr. George Rieke (runs through December 2013; see AAVSO Alert Notice 482). The very nearby star marked 96 (HD 15407B, AUID 000-BKY-170) was selected as the comparison star for this target. However, it has been found that the published magnitude of this star is questionable, and the astronomers have withdrawn it as the comparison.

Charts and Sequences Updates September 2012

The latest release of APASS has allowed us to create new sequences and improve older sequences for hundreds of stars.

If you would like to request a new comparison star sequence for a star that currently does not have one please see the instructions for doing so located here.

If you find an error or have issues with an existing sequence, please submit those to CHET.

Request Comparison Stars for Variable Star Charts

[Note: If your variable star has an existing sequence, even if it is only one comparison star, please request assistance via CHET. This page is only for variables that have NO comparison stars. Thank you.]

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

The link below contains the list of the current stars in the AAVSO PEP-V program.  Observations of any of these stars made using the AAVSO standard PEP method and these comparison and check stars may be submitted to AAVSO headquarters for automated data processing.

Click here to obtain a comma-separated (.csv) list of PEP-V target, comparison, and check stars.

This file is the current revision as of 2015 January 05.

AAVSO Photometric All-Sky Survey: Data Release 1

AAVSO Photometric All-Sky Survey (APASS)

Data Release 1

September 10, 2010

Arne Henden (AAVSO), Matthew Templeton (AAVSO), Dirk Terrell (SwRI), Tom C. Smith (DRO), Stephen Levine (Lowell), Doug Welch (McMaster)

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484