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.

Mercury at Western Elongation

   On Saturday March 6th Mercury, the innermost planet, will reach its orbital position known as greatest western elongation at 27.3o. 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!

   Mercury is currently visible in the morning skies before the Sun rises. This inner planet is steadily moving past Jupiter after having passed by Saturn last week.

   
   
   
   
   

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 on the Move – And A Comet!

   Over the next several mornings the innermost planet, Mercury, will be moving past the planet Jupiter, coming the closest on March 4th in the hour or so before the Sun rises.

   In the same field of view as Mercury and Jupiter is Comet Tempel (10P) a periodic comet that has a 5-year orbit around the Sun. This comet is one of the many comets that is part of the Jupiter family of comets. Tempel (10P) is currently about 2.5 from the Sun and shining at about 10th magnitude. Too faint for the unaided eye or binoculars but possibly visible with a large enough aperture telescope and certainly visible with time exposure pictures.
   
   
   
   

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.

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.

Eppur Si Muove


   February 15th is Galileo Day.
   Quoting Galileo, “and yet it still moves”, in reference to the Earth actually orbiting the Sun. So how to acknowledge his achievements and contributions to modern Science? Read on…

   Jupiter’s Moons
   One enjoyable pasttime is to observe the constantly changing four largest moons orbiting Jupiter. Sometimes known as the Galilean Satellites, they are: Io, Europa, Ganymede, and Callisto. Named after Galileo who made many observations of the moons and from these observations and other observations led him to question the Geocentric model of the solar system. These four planet-sized moons are visible as small bright stars on either side of Jupiter and depending on the time and date of viewing their arrangement around Jupiter is never the same as this animated graphic, set to 1-Earth day intervals, is showing.
   Recreate Galileo’s observations of the Galilean satellites through the use of an online simulation, the Java applet, Juplet. Input dates or times to see the position of the four Galilean satellites.
The Juplet will display the planet and the satellite configuration for the date and time on the computer, or you could easily edit the date and time, and after pressing the Enter key see a different configuration. To keep track of these changes the position of each satellite relative to Jupiter could be drawn on a data table similar to Galileo’s data table.

   This video, ‘Orbs of Jupiter’, was one of the videos I made for a live musical performance at the Gottleib Planetarium at Science City in Kansas City MO. The original videos were made for full-dome projection – this one has been flattened. Music was written by Richard Johnson and performed by Rebecca Ashe (Flute) and Cheryl Melfi (Clarinet). Live and pre-recorded Electro-acoustical sampling by Richard Johnson and Daniel Eichenbaum. The soundtrack for the video is from the live performance by Dark Matter.

   
   
   

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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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.

   
   
   

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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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!
   
   
   
   
   
   
   
   
   

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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