M. F. A'Hearn writes: "The Working Group on Standard Filters for Cometary Photometry established by IAU Commission 15 announces the availability of sets of standardized filters for photoelectric photometry (non-imaging) of comets. Observers wishing to obtain a set of filters should contact me at the address: Astronomy Program, University of Maryland, College Park, MD 20742, U.S.A."
International Astronomical Union Circular
- Pub Date:
- May 1981