Long Range Sensors Detect….
- Observing highlights for this week
- Meet Rigel–Orion’s Bright blue star
- “Observing” Exoplanets
- Observing highlights for this week: Look for Mars and more stars of Star Trek: Aldebaran and Capella. Charts are here.
- Meet Rigel: There’s a reason Star Trek chose Rigel to be one of the stars hosting inhabited worlds we meet in the future–it’s one of the brightest, and its constellation of Orion is one of the largest, obvious from even from bright urban streets. Rigel’s blue colour is clearly visible without optical aid.
A picture of brilliant Rigel (to the left) alongside reflection nebula IC 2118.
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Rigel is a blue-white supergiant, about 800 light-years distant but luminous enough to still shine in our sky as the seventh brightest star. ….roughly 75 times the diameter of the Sun… If our Sun and Rigel could swap places, Rigel would be large enough to nearly encompass the orbit of the planet Mercury. The reason behind Rigel’s immense diameter lies in the fact that it has extinguished its supply of hydrogen and has moved on to the next phase of its lifecycle, which causes the star to expand vastly. But even as it ages, Rigel remains very hot, and this high temperature is the cause of its blue color.
For enjoyable early evening viewing, opt for late fall or early winter, when Orion pops up over the eastern horizon not long after dusk. Later, in early spring, you can easily catch Orion riding high in the southern sky just after sunset. This is also a fine time for observing, with warmer evenings and the constellation placed high up in clearer air. READ MORE
- “Observing” Exoplanets: Exoplanets pepper the night sky–3,878 spread across 2,896 planetary systems as of November 14, 2018 We may not be able to observe them directly, but we can use their host stars as surrogates to envision them in our mind’s eye. READ MORE, and View Charts