Inner Meets Outers – In A Triple Conjunction

   Sunday morning February 28th the innermost planet, Mercury, and two of the ringed outer planets, Jupiter and Saturn, will be in a triple conjunction as Mercury moves eastward past Saturn and then Jupiter. Mercury will be about 3-4o from Saturn and about 2-3o from Jupiter.
   All three will almost fit within the field of view of binoculars and should make for an interesting contrast in apparent magnitudes however Jupiter (-1.97) far outshines Mercury (0.30) and Saturn (0.71).

   
   
   

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.

Mercury – Saturn – Jupiter Together Again!

   Saturday morning February 20th in the hour or so before the Sun rises look for the innermost planet Mercury to be about 4-5o from Saturn and Jupiter. All three should fit within the field of view of binoculars, but the three planets will be low above the horizon.

   
   
   

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.

Conjunction – Elongation – Conjunction

   Saturday evening watch for the 11-day old waxing gibbous Moon to be in conjunction with and about 3o from the reddish star Aldebaran in the constellation Taurus the Bull.

   Earlier in the evening the innermost planet Mercury was visible over the western horizon shortly after sunset. Mercury, on this date, will be at its Easternmost Elongation for this orbit. At elongation, eastern or western, Mercury, and also Venus, will be as far ‘out’ from the Sun to the right or left as we see the inner planets from Earth. At eastern elongation the inner planets follow the Sun across the sky during the day and appear as evening planets over the western horizon. At western elongation the inner planets ‘lead’ the Sun across the Sky during the day which means they rise ahead of the Sun and are seen as morning planets.

   But Wait – there’s still more!
   Saturn reaches solar conjunction on this date. During solar conjunction for an outer planet that outer planet will either be too close to the Sun to be seen or is on the opposite side of the Sun. When an outer planet reaches solar conjunction it moves from the evening skies to the morning skies.

   
   
   

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Waxing Crescent Moon – Mercury Conjunction

   Did you miss the 27-day old thin waning crescent Moon conjunction with Venus this past Monday morning? I did!
   Well there is an opportunity to see the thin crescent Moon on this side of new phase this Thursday evening January 14th. The 1.7-day young waxing crescent Moon will be over the western horizon in a line-up of sorts with Mercury, Jupiter, and Saturn all angled downward toward the western horizon. From Saturn to the Moon will span about 13o with Mercury, about 3-4o to the west, (down to the right) being the closest of the 3 planets.

   This animated graphic is set for 2-minute intervals starting at 5:30 pm CST.

   
   
   

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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.

   
   
   
   
   
   
   
   
   

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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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New Year’s Eve 2020

   The evening skies of this year’s New Year’s Eve begins at sunset with two of the giant planets, Jupiter and Saturn, low over the western horizon at sunset, but still within about 1o from each other. Higher over the southern horizon is the planet Mars. And with optical assistance or a camera the other two gas giant planets, Uranus and Neptune, as well as Dwarf Planet Ceres could be seen.

   Later, at around midnight and centered over the southern horizon will be the ‘regular’ Northern Hemisphere winter display of stars. This is a familiar groups of bright stars in a rough circle around the constellation of Orion the Hunter, and sometimes referred to as the “Winter Hexagon” or ‘Winter Circle”.

   As the winter hexagon the member stars are Rigel in Orion the Hunter, Aldebaran in Taurus the Bull, Capella in Auriga the Charioteer, Pollux and Castor in the Gemini Twins, Procyon in Canis Minor, and Sirius in Canis Major.


   
   
   
   We’ve survived another orbit.
   
   
          Happy New Year!
   
   
   
   
   
   
   
   
   

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December Moon at Apogee

   Our Moon reaches apogee, (furthest from Earth), for this orbit, on Thursday December 24th. For this apogee the 10-day old waxing gibbous Moon will be at a distance of 31.75 Earth diameters, 251,662 miles (405,011 km) from the Earth.

click on graphic to see it larger   On the date of the apogee, and high above the southern horizon, is the 10-day old waxing gibbous Moon. The Moon will be about 13o to the east from the planet Mars, and about 2-3o from the outer planet Uranus. Jupiter and Saturn, still close together, are low over the southwestern horizon.


   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)

   
   
   
   

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How Close is Close?

   There has been a lot of discussion about what the Grand Conjunction between Jupiter and Saturn will look like to the unaided eye. The separation will be as close as 1/5th the width of the full Moon, which is hard to visualize. Astronomically, using angular angle measurements of degrees, minutes, and seconds, the separation will be 10.0′ (10 minutes). The full Moon, for comparison, is approximately 0.50o , or one-half of a degree.

   Still hard to visualize? Hold a quarter or a nickel at arms length and look at the edge of the coin. The width of the coin’s edge at arm’s length is approximately the separation between Jupiter and Saturn on the 21st.

   Still trying to visualize the 0.10′ separation? From whenever the old days were, there was a test of visual acuity (eyesight!) that involved being able to see the double star in the bend of the handle of the Big Dipper. There are actually 3 stars there but Mizar and Alcor are the two that are more easily seen. So, if you are able to see Mizar and Alcor then you should be able to see the separation between Jupiter and Saturn.

   
   
   

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Crescent Moon – Jupiter/Saturn Conjunctions


   As we are getting ready for the Grand Conjunction on the 21st the Moon reappears in the evening skies and waxes its way past Jupiter and Saturn on Wednesday the 16th and Thursday the 17th.


   The three set around 1-2 hours after local time for sunset, and all will fit within the field of view of 7×50 binoculars as the graphic is showing.

   
   
   
   
   
   
   
   
   

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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