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.
[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.]
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.
June 22, 2005
SUBJECTS:
1. REQUEST TO MONITOR THE CV SDSS161033 (1605-00) FOR HST OBSERVATIONS
2. TU CAS COMPARISON STARS
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 However, it has been found that the published magnitude of this star is questionable, and the astronomers have withdrawn it as the comparison.
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.
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:
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)
