September 2009

Autumnal Equinox

Autumn begins on September 22nd when the Autumnal Equinox occurs. The Autumnal Equinox occurs when the tilt of the Earth is in tangent with the orbit of Earth around the Sun.  This point marks the beginning of Autumn.  An Equinox has an equal amount of daylight and nighttime.

Lunar Events

The Full Moon for September occurs on the 4th.  The Full Moon is called the Full Fruit Moon and is also known as the Barley Moon.

The New Moon for September occurs on Friday, September 18th this will make the weekend of September 19-20 as the best weekend for deep sky observing.

Mercury

Mercury crosses from evening to morning hours this month.  Mercury is observable in the evening until around September 14th when it disappears into the glare of the Sun.  Mercury re-emerges into the evening around September 26th.  Mercury is in retrograde motion between September 7th through September 28th.

The above movie shows the path of Mercury during the month of September. Each frame is one sideal day. Note the retrograde motion as is moves past the Sun as it crosses from evening to morning hours.

Mercury begins September in the constellation Virgo (The Maiden) and on September 22nd it crosses into the constellation Leo (The Lion) where it spend the rest of the month.

Venus

Venus is the Morning Star for September. Venus begins September in the constellation Cancer (The Crab) until September 10th went it moves into the constellation Leo (The Lion).

Mrcury, M44 September 1st finds Venus within 1°15’ for the Beehive Cluster (M44).
On September 16th, the waning, crescent Moon passes within 3°30’ of Venus. Mercury, Moon
Mercury, Regulus On September 20th, Venus passes with 0°30’ of the star Regulus.

Mars

Mars is observable in the morning hours of September in the constellation Gemini (The Twins) this month.  Mars rises around 1:20 am (PDT) at the beginning of September and by the end of the month rises around 12:45 am (PDT).

On September 13th, Mars rises within 3°34’ below the waning, crescent Moon with will pass within 1° of Mars on that day. Mars, Moon

Jupiter

Currently in retrograde motion, Jupiter is located in the constellation Capricornus (The Sea Goat) until January 2010.  Jupiter is observable in the evening and mid-night hours of September; setting around 4:55 am (PDT) at the beginning of the month and setting around 2:50 am (PDT) by the end of September.

Jupiter, Neptune and Moon On September 3rd, the waxing, gibbous Moon rises within 4°30’ of Jupiter and Neptune.
On September 30th, the waxing, gibbous Moon rises within 2°20’ of Jupiter and Neptune. Jupiter, Neptune and Moon

Saturn

Due to its position near the Sun, Saturn is not observable this month.  Saturn ends it long stay in the constellation Leo (The Lion) on September 2nd, when it will pass into the constellation Virgo (The Maiden) where it will remain until December 6th, 2012.

Uranus

September is the best month this year to observe Uranus as it reaches Opposition on September 17th. Uranus is visible all night, all month and is located in the constellation Pisces (The Fish).

Uruanus at Opposition
Uranus at Opposition on September 17th - The above images show the

relative position of the planet Uranus when it is at Opposition on
September 17th, relative to Jupiter, Neptune and the waning, gibbous
Moon.

On September 5th, Uranus rises within 5°15’ of the waning, gibbous Moon.

Neptune

Neptune is observable most of the night in September until the very early morning hours.  At the beginning of the month, Neptune sets around 5:20 am (PDT) and by the end of the month, Neptune sets around 3:25 am (PDT).  Neptune is moving in retrograde motion this month.

Jupiter, Neptune and Moon On September 3rd, the waxing, gibbous Moon rises within 4°30’ of Jupiter and Neptune.
On September 30th, the waxing, gibbous Moon rises within 2°20’ of Jupiter and Neptune. Jupiter, Neptune and Moon

Pluto

Pluto is observable until the late evening hours of September in the constellation Sagittarius (The Archer).  At the beginning of the month Pluto sets around 1:20am (PDT) and at the end of the month Pluto sets around 11:25 pm (PDT).

Pluto is moving in retrograde motion until September 12th.

Pluto
The relative position of pluto this month in the constellation Sagittarius.

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One Response to “September 2009”

  1. Steve Noel Sr….

    Your topic Jupiter Retrograde, June 16th – What is in store for you … was interesting when I found it on Saturday searching for mars retrograde motion as I also have articles and information posted on this subject. Thank You… Best Regards Steve Noe…


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