Moon – Jupiter & Saturn Conjunctions

   The waxing gibbous Moon, over the next two evenings (September 24th and 25th, will pass by two of the giant outer planets. The Moon will pass within about 2-3o from Jupiter and about 1-2o from Saturn.
   Off toward the eastern horizon is the innermost planet Mercury and the bluish-white star Spica in Virgo the Harvest Maiden.


   
   
   

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September Moon at Descending Node

   Wednesday September 23rd the 7-day old first quarter Moon crosses the plane of the ecliptic moving south. This is known as the descending node, one of two intersections the Moon’s orbital path (dark green line) has with the ecliptic.

   On the date of the descending node the first quarter Moon will be about 20o to the east from the heart of Scorpius the Scorpion, the reddish star Antares, and about 15-16o west from Jupiter.
   Mercury and Spica are still a couple of degrees apart but low above the horizon as the Sun is setting.

   
   
   
   
   

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Mercury- Spica & Moon – Antares

   Tuesday September 22nd shortly after sunset local time look toward the western horizon for the innermost planet Mercury to be about 1o from the bluish-white star Spica in Virgo the Harvest Maiden. The two should make for an interesting comparison in apparent magnitudes with Spica at 0.96 and Mercury with a -0.01 apparent magnitude.
   The nearly first quarter but still waxing crescent Moon will be about 7-8o from the reddish star Antares in Scorpius the Scorpion. Both are positioned over the southern horizon.

   
   
   

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September Moon at Perigee

   Our Moon reaches perigee, (closest to Earth), for this orbit, on Friday September 18st. At that time the Moon will be at a distance of 28.15 Earth diameters, 223,122 miles (359,081 km) from the Earth.

   On the day of the perigee Moon the 1.5-day old waxing crescent Moon will be over the western horizon near the innermost planet Mercury. Further to the east are Jupiter and Saturn.

   Does our Moon actually go around the Earth as this graphic shows? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   
   
   
   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to go to bobs-spaces.


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Moon-Venus Conjunction + M44

   Monday morning September 14th look eastward in the pre-dawn skies for the 26-day old waning crescent Moon to be about 4-5o from the planet Venus and about the same distance from the open star cluster M-44, the Beehive Custer.

   The trio should make for an interesting view with binoculars.
   
   
   
   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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September Moon at Ascending Node

   Wednesday September 10th the 22-day old last quarter Moon will be crossing the plane of the ecliptic moving north. This is known as the ascending node, one of two intersections the Moon’s orbital path has with the ecliptic. The ecliptic is actually the Earth’s orbit, and the Moon’s orbit is inclined about 6o from the ecliptic. So there are two node intersections, the ascending and descending nodes.
   On the morning of the node crossing the 22-day old last quarter crescent Moon will be to the east of the reddish star Aldebaran in Taurus the Bull. If you are a late night type watch for the Moon to rise around midnight local time giving you an opportunity to see Mars, Saturn and Jupiter arranged across the sky.

   On the other hand if you are like me and an early morning type then look for the Moon to be high above the southern horizon an hour or two before the Sun rises. Venus will be over the eastern horiozn and Mars over the southwestern horizon.

   Does our Moon actually go around the Earth as many graphics show? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
*Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)
   
   
   
   
   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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Moon – Hyades Conjunction

   Spoiler Alert: This is an early morning thing! The 21-day old Waning gibbous Moon rises late tonight (September 8th) just before midnight and then will be visible above the horizon through the rest of the morning pre-dawn hours on Wednesday September 9th. During that time the Moon will be passing the open star cluster, the Hyades, and will be about 4-5o from the reddish star Aldebaran in Taurus the Bull. From mythology the v-shaped open star cluster is the face of the Bull while Aldebaran, with its reddish color, represents the ‘angry eye’ of Taurus as it prepares to attack.

   An open star cluster, like the v-shaped Hyades and the dipper-shaped Pleiades make for interesting views using binoculars, and especially when another celestial object passes by.

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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The Red Object Tour: From Mars to Aldebaran


   Following a close encounter (conjunction) on September 5th-6th with the ‘Red Planet’ Mars our Moon will orbit eastward waning toward last quarter phase on September 9th. On the 9th the Moon will have a not as close encounter with another red celestial object. This being the reddish star Aldebaran, the ‘angry eye’ of Taurus the Bull.
   Aldebaran is at one of the open ends of the v-shaped open star cluster, the Hyades, the shape making up the Bull’s face.

   You can follow the Moon’s changing daily position with the graphic sequence below.
   
   
   
   
   
   
   
   


   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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September Apogee Moon

   Our Moon reaches apogee, (furthest from Earth), for this orbit, on Sunday September 6th. For this apogee the 19-day old waning gibbous Moon will be at a distance of 31.79 Earth diameters, 252,031 miles (405,606 km) from the Earth.

   On the date of the apogee the 19-day old waning gibbous Moon will be about 5o to the east from the planet Mars and both very visible through the night hours. Not visible to the naked-eye because of the bright Moonshine is the outer planet Uranus with a 5.8 apparent magnitude about 2-3o from the Moon.

   Does our Moon actually go around the Earth as this graphic shows? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   
   
   
   
   
   
   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to go to bobs-spaces.


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Moon-Mars Conjunction

   Saturday evening September 5th watch for the 18-day old waning gibbous Moon to be very close, about 0.5-1o, from the planet Mars. Both objects are bright with Mars having a -1.93 apparent magnitude compared with the Moon’s much brighter -12.0 apparent magnitude.
   For another apparent magnitude comparison look west for the planets Jupiter (-2.52) and Saturn (0.33).

   The two, Mars and the Moon, should make for a striking combination with binoculars or low-power telescope eyepiece.

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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