Crescent Moon – Venus Close Conjunction

   Friday morning June 19th about an hour before sunrise look toward the eastern horizon for the 27.5-day old waning crescent Moon and the inner planet Venus. The two will be separated by about 1-2o and both will easily fit within the field of view of binoculars making for a striking view.
   You will be looking at a Moon that is about 24-hours from new Moon phase, and shines with an apparent magnitude of -8.90 compared with Venus shining with a -4.29 apparent magnitude.
   Off to the west over the eastern-southern horizon are the outer planets, Uranus, Neptune, Mars, and Dwarf Planet Ceres. Further to the west are the planets Jupiter and Saturn.

   
   
   

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Moon – Mars/Neptune Conjunction

   Friday June 12th and Saturday June 13th before sunrise local time look toward the eastern horizon for the waning gibbous Moon to be near the planets Mars and Neptune. On both mornings the 20-22 day old Moon will be within about 7-9o from the two planets. Depending on your binoculars all three may fit within the field of view. However given the range of apparent magnitudes the reflected sunlight from Neptune (7.88) and possibly from Mars (-0.20) will be overshadowed by the much brighter Moon’s apparent magnitude (-12.0).


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June Apogee Moon

   Our Moon reaches perigee, (closest to Earth), for this orbit, on Wednesday June 3rd. At that time the Moon will be at a distance of 28.56 Earth diameters, 226,406 miles (364,366 km) from the Earth.

   On the day of the perigee Moon the 13.3-day old waxing gibbous Moon rises a couple of hours before the Sun sets placing the Moon over the southeastern horizon around mid-evening.

   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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May Moon at Apogee

   Our Moon reaches apogee, (greatest distance from Earth), for this orbit, on Monday 18th. At that time the 26.5-day old waning crescent Moon will be at a distance of 31.88 Earth diameters 252,028 miles (405,600 km) from the Earth.

   On the day of the apogee the thin waning crescent Moon rises about 1-2 hours before sunrise local time. Looking carefully with binoculars you may be able to see nearby 4th magnitude star 20 Ceti, one of the many stars that are part of the constellation Cetus the Whale.

   

   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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Mars – Jupiter at Heliocentric Conjunction

   Saturday May 16th the outer planets Mars and Jupiter will reach a point in their respective orbit that has them at nearly the same heliocentric coordinates. This a system of tracking the planets as they make their 360o orbit around the Sun. Each Sun orbiting object’s orbital position is measured using degrees, minutes, and seconds of heliocentric longitude. Each object orbits the Sun at a daily rate determined by dividing 360o by the number of days an object takes to complete one orbit around the Sun.
   As the above graphic shows the two planets are arranged in a straight line out from the Sun. The Earth is not part of the line-up. This is a heliocentric view of their orbital positions with the Sun at the Center. A heliocntric longitude based view is not the same as a view from the surface of the Earth where there is a distinctly different view of the two 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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Moon Mars Conjunction x2

   Thursday morning May 14th the last quarter Moon will be about 8-9o to the west from the ‘Red Planet’ Mars. The following morning, Friday May 15th the waning crescent Moon will be about 6-7o from Mars but this time on the east side.



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-Jupiter-Saturn Conjunction

   Tuesday morning May 12th, before sunrise, the 19-day old waning gibbous Moon will be within a few degrees from the outer planets Jupiter and Saturn. All three will fit within the field of view of 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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May Moon at Descending Node

   Sunday May 10th the 17-day old waning gibbous 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 waning gibbous Moon will be above the southern horizon at sunrise and will be near the western edge of the Milky Way. However the Moon’s reflected sunlight dims out the glow of the Milky Way. To the east are 4 of the visible planets, Jupiter, Saturn, Mars. Dwarf Planet Ceres, and Neptune are also part of the line-up along the ecliptic, but both have apparent magnitudes too dim to be naked-eye visible.

   
   
   
   
   

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 – Antares Conjunction

   Saturday morning May 9th the 16-day old waning gibbous Moon will be about 6-7o from the heart of Scorpius the Scorpion, the reddish star Antares.
   Joining the waning gibbous Moon will be the several of the visible planets arranged west to east starting with Jupiter, then Saturn, and Mars further east. The Dwarf Planet Ceres is also part of the planet spread but at 8th magnitude Ceres would require binoculars to see.

   
   
   
   

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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Saturn at Western Quadrature – 2020

saturn-west-quadrature   Tuesday April 21st, the position of the planet Saturn with respect to the Earth and the Sun places this ringed planet at what is called western quadrature. Saturn is at a 90 degree angle from us as this graphic shows. Think third quarter Moon as that is a fair comparison of the relative positions. At this position Saturn leads the Sun across the sky from east to west as the Earth is rotating, meaning that Saturn rises before the Sun and also sets before the Sun.

Saturn currently is within the constellation of Sagittarius the Archer as this graphic shows. From the northern hemisphere, looking toward the southern horizon, you can find Saturn over the southeastern horizon about midway between Mars to the east, left, and Jupiter to the west, right.

Learn a little (or a lot) about Saturn by visiting the Cassini at Saturn mission web site.
Click here to go to the Cassini Mission web site.

   This is a short 5 minute video I made as part of a live musical performance called “Orbit”. This is a piece from the much longer tour of the solar system performance and video and shows Saturn and some of its moons as viewed from the Cassini spacecraft that month.

   
   
   


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.