Audio recordings of Helen Hogg's appearances on TV Ontario, circa 1970.  Courtesy Randy Attwood.

by K.E. Chilton, F.R.A.S.

• ECLIPSING BINARIES
  • Algol type Variables
  • Beta Lyrae Stars
  • W Ursae Majoris Stars
  • Peculiar Eclipsing Binaries—W Ser, UX UMa types
• INTRINSIC VARIABLES
  • RR Lyrae Stars
  • Classical Cepheids
  • Beta Canis Majoris Variables
  • Delta Scuti Variables
  • Long Period Variables
  • Semi-Regular Variables—A, B, C, D
  • RV Tauri Stars
  • Irregular Variables
  • Eruptive Variables—U Gem, Z Cam
  • Nebular Variables—RV Aur, T Ori, T Tau

POSSIBLE MAGNITUDE VARIATIONS OF SATURN'S SATELLITES

by K.E. Chilton, Planetary Coordinator

For many years it has been known that he magnitude of Iapetus, Saturn's outermost moon, is variable. Recent observations have indicated that some of the other moons may vary in brightness, too. (Refs. 1,2) This was pointed out in Planetary Bulletin No.9. However, observers were left ot their own devices to work out the positions of the satellites.

Published in the October 1970 National Newsletter. [PDF]

The Moon that Never Was (Maybe?)

After reading about the “Planet That Never Was” in the last issue of the NEWSLETTER, I thought that our readers might be interested in a satellite which was photographed 13 times near the turn of the century but has never been seen since. This was Themis, a supposed tenth moon of Saturn.