2020: August 22: Jupiter, Saturn, Bright Evening Planets

Jupiter and Saturn, August 21, 2020
2020, August 21: Jupiter is 2.4° to the lower left of Pi Sagittarii (π Sgr) and 2.2° to the lower right of 50 Sagittarii (50 Sgr). On for the next few weeks, watch Jupiter move closer to π Sgr and farther from 50 Sgr.

Jupiter and Saturn shine brightly in the southern skies before midnight.

by Jeffrey L. Hunt

Bright Jupiter and Saturn shine from the southern skies before midnight.  They appear low in the southeast as the sky darkens after sunset.

The brightest planets appear as overly bright stars in our sky.  They rise in the east and set in the west each day along with the other stars, sun, and moon.

As the planets revolve around the sun, they move slightly eastward as compared to the starry background.

There are times when our faster moving planet approaches, passes, and moves away from the planets outside Earth’s orbit.  These outer planets seem to move westward compared to the background of stars.  This retrograde motion is an illusion. 

The planets’ retrograde motions are displayed before and after the outer planets are at opposition, when Earth is between the sun and the planet. At this time, the planets are near their closest points to Earth.  The sun and planets are in opposite directions in the sky. The distant worlds shine brightly in our sky all night.

Jupiter was at opposition on July 13 and Saturn followed a week later.  Mars is approaching its opposition on October 13, 2020.  It is closest to Earth a week earlier.

Jupiter and Saturn are retrograding.  Jupiter’s retrograde ends September 12 and Saturn, September 28.  Mars begins to retrograde September 9.  It is the bright star high in the south before sunrise.  (Venus is “that brilliant star in the east” as the morning twilight brightens.)

Watch Jupiter and Saturn continue to retrograde.  On the image above, Jupiter is 2.4° to the lower left of Pi Sagittarii (π Sgr) and 2.2° to the lower right of 50 Sagittarii (50 Sgr). For the next few weeks, watch Jupiter move closer to π Sgr and farther from 50 Sgr.

Saturn is 2.0° to the lower left of 56 Sagittarii (56 Sgr).  Watch it move beneath the star before its retrograde ends at the end of September.

Look for Venus and Mars in the morning before sunrise.

Over a week after its first appearance (heliacal rising) in the morning sky, Sirius, the night’s brightest star, shines from the east-southeast nearly 45 minutes before sunrise.

Here is a daily summary about the planets during August.

2021, May 13: The crescent moon is 3.2° to the upper left of Mercury.

2021, August 11: Waxing Moon, Evening Star

August 11, 2021:  The waxing crescent moon is to the upper left of Evening Star Venus this evening in the western sky.

The Crescent Moon, November 16, 2020

2021, August 10: Evening Star Venus, Crescent Moon

August 10, 2021:  The crescent moon is near Venus in the western sky after sunset.

2021, May 13: The crescent moon is 3.2° to the upper left of Mercury.

2021, August 9: Evening Moon, Mars

August 9, 2021: After the New moon yesterday morning, the crescent moon appears in the evening sky during bright twilight near Mars.

2021, May 13: Brilliant Venus, Mercury, and the crescent moon in the evening sky.

2021, August 3: Four Evening Planets: Venus, Mars, Saturn, Jupiter

August 3, 2021:  Four planets appear in the evening sky.  Brilliant Evening Star Venus and dim Mars are in the west after sunset.  A little later during the evening, Saturn and Jupiter are easily visible in the southeast.

Saturn (NASA)

2021, August 2: Saturn at Opposition

August 2, 2021: Saturn is at opposition with the sun.  Earth is between the sun and the planet.



Categories: Astronomy, Sky Watching

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