Xi Arietis [SEP] constellation
Xi Arietis
Xi Arietis, Latinized from ξ Arietis, is the Bayer designation for a binary star system in the northern constellation of Aries. It has an apparent visual magnitude of 5.46, and so is dimly visible to the naked eye. Based upon an annual parallax shift of as seen from Earth, it is distant from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.24 due to interstellar dust.
This is a double-lined spectroscopic binary. The spectrum
Guideline tensioner
A guideline tensioner is a hydropneumatic device used on an offshore drilling rig that keeps a positive pulling force on the guidelines from the platform to a template on the seabed.
The guidelines act as a guidance for equipment and tools that must be lowered to the template. If there was no tensioner and the platform moved, the guidelines would become slack and could be broken. For this reason a number of guideline tensioners are mounted between the platform and riser. Each of these guideline tensioners consists of a hydraulic cylinder