The Ellensburg, WA sky for the week of February 25, 2023

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 https://youtu.be/txJH8RlIoXQ. For a look at the current Dipper, face northeast at 8:00 p.m. The lowest star, Alkaid, is two fists held upright and at arm's length above the horizon. 

Sunday: The weather has been cold. It will feel good to think ahead about spring. The spring triangle, the nearly equilateral triangle of Spica, Arcturus, and Denebola. It is called the spring triangle because the three stars are rising as the Sun is setting near the start of spring. Since spring is currently a month away, the three stars rise a few hours after sunset. By 11:00 p.m., the bright star Arcturus is two and a half fists above due east. Spica is one fist above the southeastern horizon. Denebola, the dimmest of the three but still the 60th brightest star in the night sky, is four and a half fists above the southeastern horizon.

Monday: Mars is a little bit below the Moon; both are high in the southwestern sky at 9:00 p.m. Observers in eastern Greenland, the Norwegian island of Svalbard, and northwestern Russia will see the moon occult, or block, Mars.

Tuesday: Last week we learned that Clyde Tombaugh discovered the first planet 9. Will you discover the new Planet 9? You and thousands of others will have the opportunity to comb through images of the sky from NASA’s Wide-field Infrared Survey Explorer (WISE). You’ll view short “flipbook” movies of the same patch of sky on different nights. Any point of light that moves could be Planet 9 or another undiscovered Solar System object. Read about how you can join the search for Planet 9 at https://www.zooniverse.org/projects/marckuchner/backyard-worlds-planet-9. 

Wednesday: Venus and Jupiter are less than a half a degree apart from each other, one and a half fists above the western horizon at 7:00 p.m. They are so close in the sky; you couldn’t fit the Full Moon between them.

Thursday: On these late winter mornings, it is still difficult to get going. You just want to plop into a chair and sit still. But are you really sitting still? You’re moving at about 700 miles per hour due to the rotation of the Earth on its axis and 66,000 miles per hour due to the revolution of the Earth around the Sun. If that’s not enough, the entire solar system is orbiting the center of the galaxy at a whopping 480,000 miles per hour! So, while you may be sitting still with respect to your living room (and all the overachievers in your house), you are NOT sitting still with respect to the center of the galaxy. For more information about this concept, go to https://nightsky.jpl.nasa.gov/docs/HowFast.pdf. 

Friday: More celestial evidence that spring is around the corner. The wintertime constellation Orion is moving towards the western horizon. Orion’s belt is two and a half fists above the southwestern horizon at 10:00 a.m.

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 February 18, 2023

Saturday: On February 18, 1930, Clyde Tombaugh discovered Pluto, at that time classified as the ninth planet. However, as astronomers started discovering a lot of similar objects in that part of the Solar System, they realized that they had a classification crisis on their hands. Should everything in this region of the Solar System be named a planet? Eventually the International Astronomical Union (IAU) reclassified Pluto and all future Pluto-like objects as dwarf planets. This week you can celebrate the discovery with the people at Lowell Observatory, the “home” of Pluto’s discovery. Go to https://iheartpluto.org/ for more information about online events this weekend.

Sunday: Mercury is just barely above the southeastern horizon at 6:35 a.m. This is probably the last day you have a chance to see it in the morning sky for a few months.

Monday: This President’s Day, let’s remember Abraham Lincoln: 16th president, country lawyer, man on the penny, wrestler, and astronomer. Astronomer? Well, maybe not an astronomer, but someone who used observational evidence from the sky to solve a problem. In 1858, Lincoln defended Duff Armstrong, a family friend who was accused of murder. The prosecution thought they had a strong case because their primary witnesses claimed to have observed the killing by the light of the nearly full moon. Let’s listen in on the trial courtesy of the 1939 film, Young Mr. Lincoln.

Lincoln: How’d you see so well?

Witness: I told you it was Moon bright, Mr. Lincoln.

Lincoln: Moon bright.

Witness: Yes.

(Dramatic pause as Lincoln reaches for something)

Lincoln: Look at this. Go on, look at it. It’s the Farmer’s Almanack (sic). You see what it says about the Moon. That the Moon… set at 10: 21, 40 minutes before the killing took place. So you see it couldn’t have been Moon bright, could it?

Lincoln used the known information about Moon rising and setting times for August 29, 1858 as evidence in a trial. This is one of the earliest uses of forensic astronomy. For more information about Lincoln’s “almanac trial”, go to http://goo.gl/r83q4X.

Tuesday: Venus and Jupiter line up near the 1.5 day old waxing crescent moon throughout the day. Their proximity to the moon makes them good targets for daytime naked eye viewing. Wait until after 5:00 when the Sun is low in the sky and you can situate yourself so the Sun is behind something. First center the moon in the field of view of your binoculars. Then move your binoculars upward until you see a bright point of light. This is Venus. Next pull the binoculars away and look at that spot with the naked eye. See where it is with respect to the moon. Look away and look back again. Did you see Venus without binoculars? Now use your binoculars to move from the moon to Venus. Then move your binoculars to the upper left until you see another point of light, about one sixth as bright as Venus. Next pull the binoculars away and look at that spot with the naked eye. See where it is with respect to the moon. Look away and look back again. Did you see Jupiter without binoculars? This planet is more challenging because it is dimmer and farther from the moon in the sky.

Wednesday: Mars is nearly seven fists above due south at 7:00 p.m.

Thursday: 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.

Friday: Two bright stars, Vega and Deneb, are hugging the northern horizon together at 11:00 p.m. Vega, the brighter of the two, is about a half a fist above the northeastern horizon. Supergiant Deneb to two and a half fists to the left of Vega, closer to due north.

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 February 11, 2023

Saturday: Spica is about one and a half fists to the right of the moon at 6:00 am tomorrow morning. Does it remind you of a moth flying around the lightbulb-like moon? It should because Spica is a genus of moths found mainly in China.

Sunday: Are you going to watch the super bowl tonight? Is the bowl really that super? After all, half the night the bowl is tipped upside down, spilling out all of its contents. But don’t just focus on the functionality of the bowl. Think about how it inspires people all across the world to look at the night sky. In Mongolia, participants in the super bowl are known as gods. An Arabian story says the super bowl is a coffin. I encourage you to go outside tonight at about 8:00 p.m., after whatever unimportant thing you have been doing since 3:30 p.m. Look low in the north-northwestern sky and watch the super bowl, also known as the Big Dipper, balancing on the end of its handle, proudly displaying its large bowl. 

Monday: Neptune is about a pinky width to the upper left of Venus at 6:00 tonight. Normally it is difficult to find in the sky. But you may use Venus as a guide for the next three nights. First find Venus, one and a half fists above the west-southwest horizon. Tomorrow night, Venus will have moved up towards Neptune so they’ll be about half the distance apart. By Wednesday night, Neptune will be below Venus.

Tuesday: According to Greek mythology, the beautiful princess Andromeda was chained to a rock next to the ocean. Cetus the sea monster was about to devour her in order to punish her family. It seemed that all was lost. But, along came the great warrior Perseus, fresh off his defeat of the evil Gorgon, Medusa. The only similarity between Andromeda and Medusa was that Andromeda caused people to stand still and stare at her beauty while Medusa turned people to stone because of her ugliness. (And, you thought you looked bad in the morning.) Even though Perseus’ standing as the son of King Zeus and the slayer of Medusa was probably enough to win Andromeda under normal circumstances, Andromeda’s impending death-by-sea-monster was not a normal circumstance. So, Perseus drove his sword into the sea monster's neck and killed it. In a little known addendum to the story, Perseus carved “Percy (heart symbol) Andi” in the rock, thus originating the use of the heart symbol as a substitute for the word “love”.

You can find these lovers in the sky this Valentine’s Day. Just remember it is rude to stare – because you never know who might turn to stone. First, find the Great Square of Pegasus at 7:00 p.m. between one and a half and three and a half fists above the west horizon. The lowest star in Andromeda is the top star in the square. This represents Andromeda’s head. Perseus is at her feet, nearly straight overhead. Mirphak, the brightest star in Perseus, is about eight fists above the west horizon. Perseus’ body is represented by the line of stars to the left and right of Mirphak.

Wednesday: Jupiter is two fists above the west-southwestern horizon at 7:00 p.m.

Thursday: The sky is so wondrous. It makes me want to sing. Who can forget that memorable song by Three Dog Constellations Night, “The sky is black. The stars are white. Together we learn to find the light.” Well, maybe it didn’t go like that. Which is good. Because not all stars are white. Most stars are too dim to notice a color. But, two of the stars in the constellation Orion provide a noticeable contrast with each other. Betelgeuse, five fists above due south at 8:30 p.m. is a red giant. Rigel, the bright star about two fists to the lower right of Betelgeuse, is a blue giant.

By the way, the three dog constellations are Canis Major, the greater dog, found one and a half fists to the lower left of Orion; Canis Minor, the lesser dog, found two and a half fists to the left of Betelgeuse; and Canes Venatici, the hunting dogs, found low in the northeast sky, halfway between the Big Dipper and the horizon. Canis Major contains Sirius, the brightest star in the nighttime sky.

Friday: The good news is the days are getting longer and the nights are getting shorter. The better news for most readers of this column is the farther north you go in the United States, the longer the days get. Here in Ellensburg, there are almost two more hours of daylight than on the first day of winter. In the southern part of the US, there is only 50 more minutes of sunlight. If you’d like to have your own fun with day lengths and other time questions, go to https://www.timeanddate.com/sun/.

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 February 4, 2023

Saturday: The Beehive Cluster is less than a half a fist to the right of the moon at 7:00 p.m. They will stay together throughout the night. The Beehive Cluster was described by the ancient Roman astronomer Ptolemy as “a nebulous mass in the breast of Cancer [the crab]”.

Sunday: Venus is a little less than one fist above the west-southwestern horizon at 6:30 p.m. Jupiter is three fists above the southwestern horizon at this time.

Monday: Let’s review three important sets of three cats. There’s Josie, Valerie, and Melody of Josie and the Pussycats. Felix, Tom, and Sylvester from old time cartoons. And, if you want to get away from the mind-numbing effects of television, there’s Leo the lion, Leo Minor, and Lynx in the night sky. Leo is by far the most prominent of these three constellations. Its brightest star called Regulus is four fists above the east-southeastern horizon at 10:00 p.m., about a half a fist to the upper right of the moon. The backwards question mark-shaped head of Leo is above Regulus and the trapezoid-shaped body is to the left of it. Leo Minor consists of a few dim stars right above Leo. Pretty wimpy. The long dim constellation called Lynx spans from just above Leo Minor to nearly straight overhead. You and fellow stargazers won’t need to wear a long tail or ears for hats to enjoy these stellar cats.

Tuesday: Mercury is just above the southeastern horizon at 6:30 a.m.

Wednesday: At 9:45 p.m., the blue giant star called Adhara is one and a half fists above due south. It is the 22nd brightest star in the sky. Currently over 430 light years away, Adhara was only 34 light years away five million years ago. That proximity made it the brightest star in the nighttime sky at the time.

Thursday: You can set your watch tonight by carefully observing Caph, the bottom star in the E-shaped Cassiopeia. It will be due northwest at exactly 8:00 p.m. However, another star in Cassiopeia is causing astronomers to doubt whether or not they can use neutron stars as the most precise known clocks in the universe. Neutron stars have such a precise spin rate that they are used to set super accurate clocks on Earth. In 2013, astronomers using NASA’s Swift x-ray telescope noticed that the neutron star called 1E 2259+586 exhibited a spin glitch that had never been seen before. The spin rate of about eight times a minute decreased by 2.2 millionths of a second. Read more about this at http://goo.gl/C4V8R1. In 2016, astronomers using NASA’s Swift x-ray telescope observed the slowest rotating neutron star, once every 6.5 hours. What is it with using a telescope named Swift to make discoveries about something slowing? Maybe that slow developing question will be answered at https://tinyurl.com/y6ag6g7c. 

Friday: Mars is six and a half fists above due south at 7:30 p.m. Normally that would be interesting enough. But tonight Mars has an unusual neighbor. The comet C/2022 E3 is right next to Mars in the sky. You’ll need binoculars for a chance to see it. But bright Mars makes the perfect guide. See The Sky Live for more information, including maps on how to find the comet.

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.