- Find Data
  
  Variable Star Index VSX Photometry WebObs Spectroscopy AVSpec Exoplanets Exosite Solar Data Download Data AID
- Observe
  
  Observing Campaigns Variable Star Plotter VSP
- Process Data
  
  Photometric Reduction VPhot
- Submit Data
  
  Photometry WebObs Spectroscopy AVSpec Exoplanets Exosite
- Tools
  
  Julian Date Calculator Telescope Time AAVSOnet Journal JAAVSO

About Us Awards Board Blog Staff Policies Contact Us

What Are Variable Stars? Tutorials Manuals Find a Mentor

Meetings Forums Find a Member AAVSO Communications Programs & Events

Welcome Research Opportunities Volunteer Opportunities Become a Member FAQ

Store

Sign up

Sign in

About Us Get Started Forums Contact Us Donate

Home
JAAVSO
Article

Journal of the AAVSO

Volume 19 number 2 (1990)

Charles A. Whitney

Abstract

No abstract for this article is avaialable.