λ Tauri

Lambda Tauri is an eclipsing variable which can be studied over the course of several nights.

The companion partially eclipses the primary every 3 days 23 hours. This means that once you establish the maximum, it will last another two nights before it begins to dim. Then it remains at the minimum very briefly, just one evening, before beginning to brighten again.

The maximum is about 3.4 while the minimum is 4.2.

Lambda is ten degrees southwest of Aldebaran: binoculars.

To gauge the visual magnitude of lambda, compare with nearby gamma (3.65) to the northeast about half way to Aldebaran, and xi (3.73) to the southwest the same apparent distance as Aldebaran.

In the same field is 30 Tauri, a binary (Struve 452) with a colourful contrast, blue and red: 5.1, 9.8; 58, 9.6".

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1999-2014 by Richard Dibon-Smith.