LONDON: Over the next few nights, observers with clear skies and a great view of the low western horizon may be able to observe a triple conjunction between the planets Mercury and Jupiter and the bright star Regulus.
Look for this celestial trio Friday night (Aug. 7), with Jupiter, Regulus and Mercury aligning to form an equilateral triangle in the western night sky that measures about 1 degree per side. Mercury will be on top, Regulus to the left, and Jupiter to the right.
Currently, Jupiter is the brightest of the three, at magnitude -1.7. Mercury is shining with a magnitude -0.7, while Regulus is the faintest of the three, with a magnitude +1.3. Brightness in astronomy is measured on an upside-down scale where the faintest stars visible to the naked eye are magnitude 6, the brightest stars are around magnitude 0, and really bright objects like the sun, moon, and planets have negative magnitudes.
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