That semi-circular feature, 155 miles (249 km) in diameter, is a large impact crater that has been flooded by the same basalts that filled the much larger Mare Imbrium to its east - forming a round bay on the western edge of the mare. On Monday night, May 29, the terminator on the waxing gibbous moon will bisect Sinus Iridum, the Bay of Rainbows. Thursday, May 18: Razor-thin moon with Mercury and Jupiter (before sunrise) Binoculars and backyard telescopes will show the event, but extra caution must be taken to avoid pointing optics anywhere near the sun. For all but the most westerly locations, the event will occur in daylight, making finding the moon and Jupiter a challenge. The times vary by location, so use an app like Starry Night to look up your own circumstances. Jupiter will emerge from behind the dark edge of the moon about 70 minutes later. PDT and 11:40 GMT, the orbital motion of the moon (green line) will cause the bright, leading edge of the moon to pass in front of, or occult, Jupiter for skywatchers located in northern Central America, the northern Caribbean, most of North America, Greenland, Iceland, Svalbard, the northern British Isles, Scandinavia, and northwest Russia. Observers viewing them from southerly latitudes will see them, and nearby Mercury, more easily. Look above the eastern horizon just before sunrise on Wednesday, May 17 to see the very slim crescent of the old moon shining very closely to the right (or celestial southwest) of Jupiter's bright dot. Sunday, May 7: Bright moon in the Scorpion's clutches (early hours) It's southerly radiant makes the Eta-Aquariids Shower better for observers located closer to the tropics. True Eta-Aquariids meteors will appear to be traveling away from a radiant point in Aquarius, which will rise above the southeastern horizon around 2:30 a.m.
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Expect to see some fireball meteors - but less than the few dozen meteors per hour that are typical during the peak.Ī nearly full moon will lessen the show this year, but it will sink low before dawn on Saturday. Since viewing meteors requires a dark sky, watch for them before dawn on Saturday morning and then again on Saturday evening. The shower, which runs from April 19 to May 28, will peak in intensity on Saturday afternoon, May 6 in the Americas. The annual Eta-Aquariids Meteor Shower is produced when Earth's orbit carries us through a cloud of particles left behind by repeated passages of Halley's Comet. Saturday, May 6: Eta-Aquariids meteor shower peak (pre-dawn) No part of this event will be visible in the Americas. For much of Africa the moon will rise while partially eclipsed. At greatest eclipse at 17:24:04 GMT, 97% of the moon's diameter will sit within the shadow. Observers in Asia, Southeast Asia, and Australia will see the moon begin to dip into the shadow at 15:13:39 GMT and move clear of it at 19:31:54 GMT. This full moon will pass through the Earth's penumbral shadow, very slightly dimming the northern part of the moon's disk. Other common names are the Full Milk Moon, Full Flower Moon, or Full Corn Planting Moon. The Cherokee call it Ahnisguti, the "the Planting Moon", when the fields are plowed and sown. The Cree of North America call it Athikipisim, the "the Frog Moon" - the time when frogs become active in ponds and swamps. For them, it signifies a time when Mother Earth again provides healing medicines. The indigenous Ojibwe groups of the Great Lakes region call the May full moon Zaagibagaa-giizis "Budding Moon" or Namebine-giizis, the "Sucker Moon". Full moons in May always shine in or near the stars of Libra or Scorpius. The moon will reach its full phase on Friday, May 5 at 1:34 p.m. Wednesday, May 3: Bright moon passes Spica (evening) Use high magnification to look around Copernicus for small craters with bright floors and black haloes - impacts through Copernicus' white ejecta that excavated dark Oceanus Procellarum basalt and even deeper highlands anorthosite. Starting several nights before the moon reaches its full phase, Copernicus exhibits heavily terraced edges (due to slumping), an extensive ejecta blanket outside the crater's rim, a complex central peak, and both smooth and rough terrain on the crater's floor.Īround the full moon, Copernicus' ray system, extending 500 miles (800 km) in all directions, becomes prominent. This 800 million-year-old impact scar is visible with unaided eyes and binoculars - but telescope views will reveal many more interesting aspects of lunar geology. The prominent crater Copernicus is located in eastern Oceanus Procellarum - due south of Mare Imbrium and slightly northwest of the moon's center. (Image credit: Chris Vaughan Starry Night)
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