The Ellensburg WA sky for the week of 3/3/18

Saturday: The CWU Physics Department and the College of the Sciences is hosting its first Saturday planetarium show today from noon to 1 pm. Dr Cassie Fallscheer will give a presentation about what can be seen in the spring sky this year. There will be a show at noon on the first Saturday of every month hosted by different CWU astronomers and astronomy educators. The planetarium is room 101 in Science Phase II, just off the corner of 11th and Wildcat Way, H-11 on the campus map found at https://www.cwu.edu/facility/campus-map. 

The planets Mercury and Venus are as close together in the night sky as they are going to get for this orbital cycle. At 6:30 p.m., they are less than a pinky thickness from each other a half a fist held upright and at arm's length above the west horizon. Venus is the much brighter of the two. 

Sunday: It is often said that Earth is a water world because about 70% of the Earth’s surface is covered by water. What would it look like if all that water on the surface were gathered up into a ball? That “ball” would be about 700 km in diameter, less than half the diameter of the Moon. The Astronomy Picture of the day shows us right here https://apod.nasa.gov/apod/ap120515.html. 

Monday: The bright star Spica is the first stop on the Moon's Morning March Tour.  Spica is about one fist to the lower left of the Moon at 6:00 a.m. 

Tuesday: Avast ye matey. Swab the poop deck. Pirates love astronomy. In fact, the term “poop” in poop deck comes from the French word for stern (poupe) which comes for the Latin word Puppis. Puppis is a constellation that represents the raised stern deck of Argo Navis, the ship used by Jason and the Argonauts in Greek mythology. Argo Nevis was an ancient constellation that is now divided between the constellations Puppis, Vela and Carina. The top of Puppis is about a fist and a half to the left of the bright star Sirius low in the southern sky at 9 p.m. Zeta Puppis, the hottest, and thus the bluest, naked eye star in the sky at 40,000 degrees Celsius is near the uppermost point in Puppis. 

Wednesday: Jupiter, next up on the Moon's Morning March Tour, is about a half a fist to the lower right of the moon at 6 a.m. 

Thursday: The bright star Antares is one fist below the Moon at 6 p.m. While it is below the Moon is altitude, it is well above the Moon in size. Antares is a red supergiant with 400 times the diameter of the Sun. If Antares replaced our Sun in the Solar System, it would fill the entire Solar System nearly out to the planet Jupiter. 

Friday: Next week, the Moon visits Mars and Saturn in the morning sky. But you can visit them this morning. At 6 a.m., Mars is two fists above and a little east of due south. Saturn is about one fist to the left of Mars and two fists above the southeast horizon. 

The positional information in this column about stars and planets is typically accurate for the entire week. For up to date information about the night sky, go to https://nightsky.jpl.nasa.gov/planner.cfm.  

The Ellensburg WA sky for the week of 2/24/18

Saturday: Tonight is a great night to look for the Big Dipper. Tomorrow will be a great night to look for the Big Dipper. In fact, every night for many centuries will be great nights to look for the Big Dipper. But the Big Dipper’s shape slowly changes over many, many, many, many centuries. (Have I reached my word count yet?) Tens of thousands of years ago, it didn’t look like a dipper and tens of thousands of years from now, it will no longer look like a dipper. For a short video simulation of the changing Big Dipper, go to http://goo.gl/df1yV. For a look at the current Dipper, face northeast at 8 p.m. The lowest star, Alkaid, is two and a half fists held upright and at arm's length above the horizon. 

Sunday: At 6 a.m., Jupiter is two and a half fists above the south-southwest horizon, Mars is two fists above the south-southeast horizon and Saturn is one and a half fists above the southeast horizon. 

Monday: The universe contains everything from gigantic galaxy clusters to tiny parts of atoms so it is difficult to visualize all of it on the same scale. Cary and Michael Huang have created an interactive scale model of the universe which allows you to “slide” from a vantage point outside the known universe down to the smallest things ever theorized. To take this trip, go to http://htwins.net/scale2/. 

Tuesday: Venus is a little less than half a fist above the west-southwest horizon at 6:15 p.m. It's a real challenge to find in the glare of the recently set Sun but I believe in you! Much more difficult is Mercury, to the lower right of Venus, just above the horizon. 

Wednesday: It’s getting dark. The last remnant of twilight has disappeared. Suddenly, you notice a large softly radiant pyramid of light in the western sky. The base of this ghostly triangle is along the west horizon and the peak stretches two or three fists above the horizon. It is not really a ghost. It is an effect called the zodiacal light. This light comes from sunlight reflecting off dust grains in our solar system. The effect is the most visible when the band of constellations called the zodiac makes a steep angle with the horizon. You need a clear dark sky with no haze or light pollution to see the zodiacal light. At its brightest, the zodiacal light rivals the light of the central Milky Way. Look for the ghostly patch after twilight for the next few weeks. 

Thursday: Two of the best, and certainly the most available, “tools” for viewing the night sky are your eyes. Your eyes let you see the entire sky in just a few seconds. Your eyes can read star charts, decipher astronomy apps, and spot meteors while your friend is still setting up her tripod. Your naked eyes are not as effective as gathering light. They work well when the light source is comparatively bright and the detailed features are fairly large. It’s best to practice on a special Solar System body known scientifically as the Magnificent Optical Object of Nearness. Artists such as Jan van Eyck and Leonardo da Vinci produced the first realistic naked eye depictions of the Magnificent Optical Object of Nearness. This week you can use your own eyes to observe evidence of violent collisions and ancient lava flows. For more information to observe the Magnificent Optical Object of Nearness, better known as the Moon, go to http://goo.gl/JLhraO. 

Friday: The CWU Physics Department and the College of the Sciences is hosting its monthly First Saturday planetarium show tomorrow from noon to 1 pm. Dr Cassie Fallscheer will give a presentation about what can be seen in the spring sky this year. Shows are free and open to all ages. There will be a show at noon on the first Saturday of every month hosted by different CWU astronomers and astronomy educators. The planetarium is room 101 in Science Phase II, just off the corner of 11th and Wildcat Way, H-11 on the campus map found at https://www.cwu.edu/facility/campus-map. 

The positional information in this column about stars and planets is typically accurate for the entire week. For up to date information about the night sky, go to https://nightsky.jpl.nasa.gov/planner.cfm.