Waning Crescent Moon – Saturn/Jupiter/Mercury Conjunctions

Tuesday and Wednesday mornings, March 9th and 10th, the thin waning crescent Moon wil be passing by the planets Saturn. Jupiter, and the inner planet Mercury. On the 9th the 26-day old waning crescent Moon will be about 3-4o from Saturn and on the 10th the 28-day old Moon will be about 4-5o and about 6-7o from Mercury.


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.

February Moon at Descending Node

   Saturday February 6th the 25-day old waning crescent 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 25-day old thin waning crescent Moon will be over the eastern horizon at sunrise local time.

   
   
   
   
   

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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Morning and Evening Conjunctions

   Monday morning and evening, January 11th, offer an opportunity for catching a pair of conjunctions. Low over the eastern horizon at sunrise is the 27.7-day old very thin waning crescent Moon about 3-4o from the inner planet Venus.

   This could be a chance to see the Moon when it is about 24-hours from its new phase.

   Low in the western horizon at sunset is the ongoing triple conjunction between Mercury, Jupiter, and Saturn. Monday evening will be the closest Mercury and Jupiter will be as Mercury continues moving eastward away from the two giant planets.

   
   
   
   
   
   
   
   
   

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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January Moon at Descending Node


   Sunday January 10th the nearly 27-day old waning crescent 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 26.7-day old thin waning crescent Moon will be over the eastern horizon at sunrise local time. Just appearing above the horizon is the inner planet Venus.

   
   
   
   
   

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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January Moon at Perigee

click on graphic to see it larger   Our Moon reaches perigee, (closest to Earth), for this orbit, on Saturday January 9th. At that time the Moon will be at a distance of 28.8 Earth diameters, 228,292 miles (367,400 km) from the Earth.

   On the day of the perigee Moon the 25.5-day old thin waning crescent Moon will be over the eastern horizon an hour or so before the Sun rises. And just coming into view over the eastern horizon is the inner planet Venus.

   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 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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Grand Conjunction Part 2: A Triple Conjunction!

   Just when you thought it was over, it is not! Yes Jupiter and Saturn are certainly low over the western horizon and both are setting closer to sunset, however…
   The innermost planet Mercury will be passing by Saturn then Jupiter over the next several evenings (January 7th to 12th) in a series of conjunctions as the graphics below are showing.
   Each of the conjunctions brings the three planets all within the field of view of binoculars and should make for an interesting contrast in apparent magnitudes. Jupiter: -1.94; Saturn: 0.60; Mercury: 0.89.

   
   
            Be careful observing because the Sun is close.

   
   
   

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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Waning Crescent Moon – Venus Conjunction


   Saturday morning December 12th the 27-day old thin waning crescent Moon will be about 3-4o from the inner planet Venus.

    Despite the age and how thin the crescent Moon is the Moon still shines with an apparent magnitude of -9.8 compared with the -3.9 apparent magnitude of Venus. The two should make for good viewing through 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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From Spica to Venus

   Thursday morning December 10th the 25-day old waning crescent Moon will be passing by the blue-white star Spica in the constellation Virgo the Harvest Maiden, coming within about 5o from Spica.

   Over the next two days the Moon will continue moving eastward and waning to an increasingly thin crescent shape. On the morning of the 12th the even thinner crescent Moon will be about 3o from the brightly shining inner planet Venus.
   New Moon is on the 14th just in case you were wondering.

   
   
   
   
   
   

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Moon – Inner Planets & 1 Star

   The waning crescent Moon, as it moves eastward toward new Phase on the 14th, passes by the two inner planets Venus and Mercury. Yesterday the Moon was west from the planets and after 24 hours of revolution the Moon has moved to between the two planets this morning.

   
   
   

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Mercury at Western Elongation – See it in the Morning Skies

   On Tuesday November 10th Mercury, the innermost planet, will reach its orbital position known as greatest western elongation at 19.1o. At that moment Mercury, the Sun, and the Earth, would be arranged in something close to approximating a right angle as this graphic shows. Even though it sounds confusing at western elongation for either Mercury or Venus the inner planet will be to the right of the Sun as we view them, meaning that at western elongation an inner planet rises in the east before the Sun rises. And at eastern elongation with the inner planet on the left side of the Sun the inner planet follows the Sun across the sky setting after the Sun sets.

   From our perspective the orbits of Mercury and Venus appear to move from one side of the Sun to the other – out to the left (east) from the Sun to eastern elongation, then reverse and move westward (inferior conjunction) between the Earth and the Sun to western elongation. From there the inner planet moves eastward going behind the Sun (superior conjunction) and eventually reappearing on the eastern side of the Sun for an eastern elongation. Repeat over and over – do not stop!

   There is a lot to see and a few things you cannot see on the morning of Mercury’s western elongation. Going by relative apparent magnitudes Mercury (-0.52), Venus (-3.99), Spica (0.96), are all easily visible as bright to very bright star-like objects. The 24-day old waning crescent Moon shines at a much brighter apparent magnitude of (-11.52).

   
   
   
   
   

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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