The Sky This Week: April 14 – 17

Frühling - Natur

The Sky This Week: April 14 – 17

Thursday, April 14
Asteroid 6 Hebe currently lies among the background stars of eastern Leo the Lion, just a stone’s throw from 2nd-magnitude Denebola. This region rides high in the southeast during the early evening hours and peaks in the south around 11 p.m. local daylight time. This evening, 10th-magnitude Hebe lies some 2.5° due north of Denebola.

Friday, April 15
Although Jupiter reached opposition and peak visibility over a month ago (on March 8), it remains a stunning sight from dusk until the start of morning twilight. The giant planet shines at magnitude –2.4 against the backdrop of Leo the Lion. Turn a telescope on Jupiter and you will see a 43″-diameter disk with lots of atmospheric detail. And this evening, you also can observe the shadows of two of its large moons. Volcanic Io casts its shadow onto the jovian cloud tops starting at 6:55 p.m. EDT (unfortunately still during daylight), but the black dot doesn’t leave the disk until 9:10 p.m. If you miss Io, you don’t have to wait long for icy Europa’s shadow to show up. It traverses Jupiter from 9:32 p.m. until 12:18 a.m.

Saturday, April 16
Mars pokes above the eastern horizon just after 11 p.m. local daylight time this week and remains prominent until morning twilight is well underway. The Red Planet’s eastward motion relative to the background stars of southern Ophiuchus comes to a halt today; it then starts moving westward at the start of its so-called retrograde loop. This is a sure sign that Mars is approaching peak visibility, which it will reach at opposition in late May. Our neighboring world currently shines at magnitude–1.0, trailing only the Moon, Jupiter, and Sirius. When viewed through a telescope, Mars appears 14″ across and should display a prominent north polar cap as well as subtle dark markings.

Sunday, April 17
The waxing gibbous Moon’s motion through the night sky carries it near Jupiter tonight. The night sky’s two brightest objects appear only 2° apart, or about four times the Moon’s diameter.
 

Source

Astronomy Magazine