2020, December 1-7: Jupiter Closes Gap on Saturn

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Jupiter closes in on Saturn as a prelude to the December 21, 2020 Great Conjunction.  During the week look for them in the southwest after sunset.  Jupiter is the brightest star in the region.  Saturn is to the Jovian Giant’s upper left. Jupiter sets around 7:30 p.m. CST, about 3 hours after sunset for other locations.

by Jeffrey L. Hunt

As the Great Conjunction of 2020 approaches, Jupiter and Saturn are visible in the southwest after sunset during early December.

Jupiter reduces the separation between the planets in the sky by about 0.5°, about the apparent diameter of the full moon.

For more about the Great Conjunction, read our feature article. This is the closest Jupiter – Saturn conjunction since 1623.

Here is more about the planets during December 2020.

The planets are slowly moving eastward in Sagittarius, in front of several dim stars.

Jupiter is slowly over taking Saturn.

Jupiter sets around 7:30 p.m. CST, about 3 hours after sunset.  Check your local sunset time and look for the pair of planets beginning about 45 minutes after sundown until they are very low in the west, about 2 hours after sunset.

Here are the charts for the week:

December 1, 2020

2020, December 1: One hour after sunset, Jupiter is 19° up in the southwest, 2.1° to the lower right of Saturn. In the starfield, Jupiter is 2.1° to the lower left of 56 Sagittarii (56 Sgr), while Saturn is 3.7° to the upper left of that star. Additionally, Saturn is 4.5° to the lower right of Sigma Capricorni (σ Cap, m = 5.2).

December 2, 2020

2020, December 2: One hour after sunset, Jupiter is 19.0° up in the south-southwest. Dimmer Saturn is 2.0° to the upper left of the Jovian Giant. In the starfield, Jupiter is 2.3° to the lower left of 56 Sagittarii (56 Sgr), and Saturn is 3.8° to the upper left of the star. Additionally, Saturn is 4.4° to the lower right of Sigma Capricorni (σ Cap).

2020, December 3: One hour after sunset, Saturn is 20.0° up in the south-southwest. Dimmer Saturn is 1.9° to the upper left of the Jovian Giant. In the starfield, Jupiter is 2.4° to the lower left of 56 Sagittarii (56 Sgr), and Saturn is 3.9° to the upper left of the star. Additionally, Saturn is 4.3° to the lower right of Sigma Capricorni (σ Cap).

December 4, 2020

2020, December 4: One hour after sunset, Jupiter is 1.8° to the lower right of Saturn. Jupiter is 2.5° to the left of 56 Sagittarii (56 Sgr), while Saturn is 3.9° to the star’s upper left. Saturn is 4.2° to the lower right of Sigma Capricorni (σ Cap).

December 5, 2020

2020, December 5: Jupiter and Saturn are low in the southwest as the sky darkens after sunset. Saturn is 1.7° to the upper left of Jupiter. Among the stars, Jupiter is 2.7° to the left of the star, while Saturn is 4.0° to the upper left of 56 Sagittarii (56 Sgr). Additionally, Saturn is 4.1° to the lower right of Sigma Capricorni (σ Cap).

December 6, 2020

2020, December 6: One hour after sunset, Saturn is nearly 19° in altitude above the southwest horizon, 1.6° to the upper left of Jupiter. Saturn is 4.1° to the upper left of 56 Sagittarii (56 Sgr), while Jupiter is 2.8° to the lower left of the star. Saturn is approaching Sigma Capricorni (σ Cap). This gap is 4.0°.

December 7, 2020

2020, December 7: Jupiter – over 17° up in the southwest – is 3.0° to the left of 56 Sagittarii (56 Sgr). Saturn is 4.2° to the upper left of that star and 3.9° to the lower right of Sigma Capricorni (σ Cap).

2021, February 19-21: Moon in Taurus

February 19-21: The bright moon moves through the constellation Taurus. Use a binocular to see the starry background with the moon.

2021, February 18: Evening Moon, Mars, Pleiades

February 18, 2021: The moon, waxing toward its First Quarter moon phase, is high in the southwest after sunset. Planet Mars is 3.8° to the upper right of the moon. Mars is parading eastward compared to the starry background in eastern Aries as it heads toward the Taurus border.

2021, February 6: Morning Moon, Antares

February 6, 2021: Before sunrise, look east-southeast for the waning crescent moon. It is 4.5° to the upper left of Antares – the rival of Mars.



Categories: Astronomy, Sky Watching

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