Wonder where the moon’s been hiding lately? Unless you’re up around 3 a.m. it’s been scarce this past week. All that time our favorite cratered world has been slimming down in the morning sky.
Now it’s a waning crescent fingernail, what many consider the moon’s most eye-catching phase.
Tuesday morning June 24 at dawn the thin crescent will join Venus in the constellation Taurus just below the pretty Pleiades star cluster. About 1 1/2 degrees or three moon diameters will separate Venus and the moon. To see this beautiful conjunction, look low in the northeastern sky at the start of dawn.
For the best view of the Seven Sisters, I recommend binoculars. Whenever I’ve had a reason to be up before sunrise in early summer I make a point of looking at the cluster. Taurus, neighboring Auriga and the Pleiades all belong to the winter sky, but we get a preview of that inevitable season as early as the first mornings of summer. There’s something delicious about seeing the first stars of winter as the robins sing in the dewy woods.
Live in the far southern U.S.? You’ve got one more lunar visitation. This one will be challenging. On Thursday morning, the moon, just 21 hours before new, will glide a fraction of a degree south of the planet Mercury in a bright sky only minutes before sunrise. The moon will hover very low (5 degrees) in the northeast in a bright sky. Whatever you do, bring binoculars. You might need them to find the moon at all.
Like the moon, Mercury’s an extremely thin crescent and very faint, shining at just magnitude 3.5. Skywatchers might spot it in binoculars, but I’m not betting on it. With very clear skies, there’s a chance of seeing the planet directly above the northern cusp of the moon with a small telescope. Should you succeed, you’ll be rewarded with the rare sight of two delicate crescents one atop the other. Find a location with a wide open view to the northeast and start looking about 15 minutes before sunrise.
The moon will cover up or occult the planet for observers in northern South America, but again, this will happen in a bright sky and prove tricky to see.
Just a reminder. Although no auroras showed last night at mid-latitudes, there’s still a chance for a minor storm tonight. I’ll send out a notice if that happens.