Saturday: You can see some stars during the day with a small telescope or binoculars. The best candidate today is Spica because it is so close to the moon in the sky. First find the moon, due south at 7:00 p.m. Then aim your small telescope or binoculars at the moon. Spica is to the lower left of the moon. As time passes, the moon slowly moves eastward, to the left, with respect to the background stars. Follow these two objects until about 7:15 p.m. the moon will move between Spica and Earth, blocking it from view. This is called an occultation. By 8:35, Spica will reappear from the right, the lit, side of the moon.
Sunday: Mercury is a half a fist above the west-northwestern
horizon at 9:30 p.m.
Monday: Nine years ago today, NASA’s New Horizons probe
passed by Pluto. If the band Nirvana were 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 http://pluto.jhuapl.edu/.
Pluto, itself, is exactly two fists above due south.
Hey, wait, I’ve got a new complaint. People should be more
interested in astronomy. The best group to start with is children. If you are
stuck at home, wondering what to do, go to the NASA Kids Club website at https://www.nasa.gov/kidsclub/. There
are fun and educational activities for younger children. Older children may
like my favorite NASA website about planets outside our Solar System. I suggest
first exploring the “Galaxy of Horrors!” at https://exoplanets.nasa.gov/alien-worlds/galaxy-of-horrors/.
Tuesday: Saturn is one fist above the east-southeastern
horizon at midnight.
Wednesday: Say "Cheese". 174 years ago, 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.
Thursday: The Southern Delta Aquarid meteor shower has a
long gradual peak 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 two and a half fists above the
southeast horizon at 3:00 am early this morning. You can follow this point
throughout the night and for the next few weeks, as it will remain a fist above
Fomalhaut, the brightest star in that section of the sky. Read about the
shower, at https://earthsky.org/?p=159138.
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.
Friday: Take a two and a half hour walk today. Too long, you
say? 55 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. Their
colleague Michael Collins orbited the Moon in the spacecraft the astronauts
would use to return to Earth. While everyone seems to know about Armstrong and
Aldrin, spend some time learning more about Collins by reading https://time.com/5624528/michael-collins-apollo-11/.
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.
All times are Pacific Time unless noted.
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