Thursday, July 13, 2017

The Ellensburg WA sky for the week of 7/15/17

Saturday: Jupiter is two fists held upright and at arm’s length above the southwest horizon ay 10 p.m. With binoculars or a small backyard telescope, you can see up to four if its moons. With a large backyard telescope you can see its Great Red Spot, a storm larger than the Earth. With the URL to this Sky and Telescope article:, you can really see Jupiter’s Great Red Spot. The NASA Juno probe recently sent back the first close-up images of the Spot. Over the past few decades, it has been getting smaller and less red. Soon it will be called the “So-so rust-colored spot”. Jupiter and the future So-so rust-colored spot are two fists above the southwest horizon at 10 p.m.

Sunday: The Southern Delta Aquarid meteor shower peaks for the next few weeks into mid-August. Meteor showers are named after the constellation from which the meteors appear to originate. These meteors appear to come from a point in Aquarius near the star Delta Aquarii, also known as Skat. This point is about one and a half fists held upright and at arm’s length above the southeast horizon at 1 am tonight. You can follow this point throughout the night, as it will remain a fist above Fomalhaut, the brightest star in that section of the sky. The best time to view the shower is just before morning twilight. For more information about this year’s shower, go to As your Mother might say, dress warm and sit in a comfortable chair for maximum enjoyment. Meteors are tiny rocks that hit the Earth and burn up in the atmosphere.

Monday: Say "Cheese". 167 years ago today, Vega, in the constellation Lyra the lyre, became the first star ever photographed. The photograph was taken at the Harvard Observatory using the daguerreotype process. Vega is the third brightest nighttime star we can see in Ellensburg, behind Sirius and Arcturus. Vega is nearly straight overhead at 11:00 tonight. 

Tuesday: Last week marked the two-year anniversary of NASA’s New Horizons probe passing by Pluto. If the band Nirvana was still together, they’d probably rewrite one of their hit songs to be called Heart-Shaped Spot, after one of Pluto’s most distinctive features. “She eyes me like a dwarf planet when I am weak. I’ve been imaging your heart-shaped spot for weeks.” Astronomers think this heart-shaped spot is a large plain of nitrogen ice that consists of convective cells 10-30 miles across. Solid nitrogen is warmed in the interior of Pluto, becomes buoyant, and bubbles up to the surface like a lava lamp. You will find great pictures and information about what New Horizons found this past year at Hey, wait, I’ve got a new complaint. People should be more interested in astronomy.

Wednesday: Saturn is two fists above due south at 10:30 p.m.

Thursday: Take a two and a half hour walk. Too long, you say? Forty-eight years ago today, Neil Armstrong and Buzz Aldrin took the first ever walk by humans on another world. They spend two and a half hours setting up scientific instruments and collecting rocks for study back on Earth. Michael Collins orbited the Moon in the spacecraft the astronauts would use to return to Earth.

Friday: One month from today, the Moon will pass between the Earth and Sun as seen from a large swath across the United States. This total solar eclipse will be the first one visible in the lower 48 states since 1979. If you want to travel to the path of totality, plan ahead. Scientists estimate that this might be the most viewed total solar eclipse in history. Leave early. Make sure you have a full tank of gas. Bring extra food and water. Don’t forget safe solar eclipse glasses and the proper filters for your binoculars or telescope. For more information about the eclipse, go to the Great American Eclipse website at

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

No comments: