A clear sky this morning allowed brilliant Morning Star Venus and bright Mars to put on a planetary display before sunrise.
by Jeffrey L. Hunt
A north breeze that cleared smoke from the western wildfires revealed bright planets and bright stars.
At about 4 a.m. CDT, bright Mars was high in the south-southwest. It is among the dim stars of Pisces. The Red Planet is slowly retrograding – moving westward compared to the starry background. This illusion occurs when our faster moving planet approaches and passes the slower moving outer planets.
Mars is closest to Earth on October 6. As Earth approaches Mars, the Red Planet becomes brighter, but not much larger in appearance to the human eye. While it can double in its apparent size through a telescope, the increase is imperceptible to the human eye (unlike what is shown in the social media memes.)
Earth moves between the sun and Mars on October 13. This is called opposition, because the planets appear on opposite sides of Earth and their place and visible times are opposite of each other.
At opposition, a planet rises at sunset, appears in the south around midnight, and sets in the west as the sun rises in the east. Mars appears at opposition about every 26 months.
On the photo above, Mars appears 1.9° to the upper left of Nu Piscium (ν Psc on the photo) and 2.5° to the lower left of Omicron Piscium (ο Psc).
At this hour, brilliant Venus is low in the east. An hour later, about 90 minutes before sunrise, the planet is higher in the sky.
At this time Venus appears with other bright stars. The night’s brightest star, Sirius, is low in the southeast. About a month ago, the star made its first appearance in the morning sky this year.
The famous constellation Orion – with its bright stars Betelgeuse and Rigel – are to the upper right of the Dog Star.
With a binocular the Orion Nebula, a stellar nursery – is visible as a hazy cloud. The Little Dog Star – Procyon – is nearby. The Gemini Twins – Castor and Pollux appear above Venus
Among the stars Venus is moving eastward in the very dim starfield of Cancer. This morning it is 1.4° to the lower left of Omicron Cancri (ο Cnc on the photo). Watch Venus move farther away from ο Cnc.
Here is a daily summary about the planets during September.
2022, January 3: Venus – Moon Conjunction
January 3, 2022: The moon passes Venus for the final time of this evening appearance of Venus. As night falls, Mercury, Saturn, and Jupiter are visible in the southwest. Mars is in the southeast before sunrise.
2021, December 30: Sirius at Midnight
December 30, 2021: As the year ends and the new one opens, the night sky’s brightest star – Sirius – is in the southern sky at the midnight hour.
2021, December 31: Mars – Moon Conjunction, Four Evening Planets
December 31, 2021: This morning before sunup, the thin waning crescent moon appears near Mars and the star Antares. Four planets – Venus, Mercury, Saturn, and Jupiter – are on parade in the southwest after sundown.
2021, December 30: Scorpion Morning Moon, Four Evening Planets
December 30, 2021: The morning crescent moon seems to be captured in the Scorpion’s pincers to the upper right of Mars. Four Evening Planets – Venus, Mercury, Saturn, and Jupiter – are in the southwest after sundown.
2021, December 28: Andromeda High in South
December 28, 2021: The Great Andromeda Galaxy is nearly overhead at the end of the evening twilight.
Categories: Astronomy, Sky Watching
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