When you face southwest and crane your head way, way up, the cross appears to stand upright. Its brightest stars form the big Northern Cross. ■ Cygnus the Swan floats just about straight overhead these evenings. #Sky and telescope magazine oct 2015 download full#For full timetables of the Red Spot's transits as well as the doings of Jupiter's moons and their shadows, see the Celestial Calendar section of Sky & Telescope magazine. ■ Jupiter's Great Red Spot should cross Jupiter's central meridian around 9:04 p.m. That's theoretically discernable by eye - but without near-match comparison stars nearby, good luck. The dwarf passes in front of the bright star every orbit from our point of view, dimming it by 0.24 magnitude. Jupiter is 175 times brighter! How early (or more likely, late) in twilight can you first make out Delta Cap?ĭelta Cap is an interesting star: a magnetic white subgiant, spectral class A7m, nine times brighter than the Sun and closely orbited by a small, dim orange dwarf almost exactly once a day. Tonight they're 1.5° apart, about a finger's width at arm's length. As the stars come out this week, look for 3rd-magnitude Delta Capricorni just below or lower left of Jupiter. The components of Beta are half as far apart, much more unequal, and oriented roughly the same way as the Alpha pair. Alpha is a wide pair of yellow-orange giants that the smallest binoculars easily resolve so does our chart below. The scene is shown below for late twilight this evening.įarther to the upper right of Saturn, look for Alpha and Beta Capricorni. All week Jupiter shines just above or upper right of 3rd-magnitude Delta Capricorni, Deneb Algedi (the name means "Tail of the Young Goat"). ■ Bright Jupiter and fainter Saturn continue to dominate the southern evening sky, 16° apart. As of September 21st it was back up to magnitude 6.7, more than twice as bright as its original March eruption from its 15th-magnitude baseline. Nova Cassiopeiae 2021 carries on, fluctuating unpredictably as it remains in binocular view six months after its March explosion.
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