Photoelectric Targets and Data Reduction
Spreadsheet for reducing BVRI data (Change Log) NEW
How to export a WebObs-compatible upload file from the BVRI spreadsheet .docx version text version
photometry
Bands in optical data in the AAVSO International Database
Bands in optical data in the AAVSO International Database (AID)
Each variable star observation in the AID contains a field that specifies the band (filter) used in making the observation.
For data downloaded from the AID using the data-download tool, the band is given as an abbreviation (e.g., visual is Vis, Johnson V is V).
In special cases, the band (e.g. visual) may be represented as a number (e.g., 0). The following numbers represents the following bands:
Alert Notice 703: TCP J21040470+4631129 images, photometry, and spectroscopy urgently requested - REVISED
Note: This Alert Notice was revised from its original text to correct a misinterpretation of the request from Dr. Echevarria, to update the recent observations, and to update the status of scheduled HST observations. - Elizabeth O. Waagen, 2 April 2020
April 2, 2020 (original issued April 1, 2020)
Exoplanets and the Search for Extraterrestrial Life
Variable Stars and the Stories They Tell: Exoplanets and the Search for Extraterrestrial Life
©February 2018 by Dale Alan Bryant
(In memory of M.I.T. astrophysicist Dr. Philip Morrison - who started all this...)
Though the figures are tough to keep up with - they are changing, almost daily - the Kepler Space Telescope (KST) has discovered, to date, over 4,500 exoplanet candidates, ~3,400+ of which have been confirmed.
APASS: The AAVSO Photometric All-Sky Survey
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.
The AAVSO Research Portal
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 gray 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.
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.]
How to report new variable star discoveries
What do I do when I discover a new variable star?
(Jump to Reporting Possible Nova Discoveries)
Special Notice #405: Request for Monitoring of V4641 Sgr
August 4, 2015: Dr. Gregory Sivakoff (U. of Alberta) has requested optical monitoring of the galactic microquasar V4641 Sgr beginning immediately, and continuing for the next 120 days, or until it is no longer observable from your location.