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

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Alex Pratt

Observer

Alex Pratt

Observed

2017 Nov 06 - 02:32

Uploaded

2017 Nov 06 - 13:22

Objects

Aldebaran
Conjunction

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

1/2000th sec

Location

Z92

Target name

Aldebaran - alpha Tauri - R 692

Title

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. 

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