British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images Alex Pratt

Observation by Alex Pratt: Lunar occultation of Aldebaran - disappe...

Uploaded by

Alex Pratt


Alex Pratt


2017 Nov 06 - 02:32


2017 Nov 06 - 13:22



  • NexStar 127mm f/12 Mak-Cass
  • Watec 910 video camera
  • IOTA-VTI GPS video time inserter

1/2000th sec



Target name

Aldebaran - alpha Tauri - R 692


Lunar occultation of Aldebaran - disappearance at bright limb

About this image

I am now the steward of Melvyn Taylor's 127mm f/12 Maksutov-Cassegrain alt/az telescope.

The Aldebaran occultation (disappearance at bright limb, reappearance at dark limb), was an ideal first opportunity to use this fine little 'scope. I prefer Mak-Cass optics to Schmidt-Cass designs; they have larger f/ratios and can give notably sharp images with good contrast, particularly useful for lunar occultations.

Aldebaran is a type K5 giant star, so as expected, its occultations aren't instantaneous. The DB and RD events have durations of about 0.1s on the videos.

I always use Vega as first-light guest object for a new telescope (one of the few things I have in common with the great Leslie Peltier!) so that tradition can be maintained with a view through the eyepiece on the next clear night. 

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.