Dance of the Planets-Sep. 18

   The ‘dancing’ continues.
   Monday morning September 18th there will be a ‘solar system cluster’ (for lack of another term!), in the hour or so before the Sun rises.
   Look eastward for three planets (Venus, Mars, Mercury), the 27.5-day old thin waning crescent Moon, and the star Regulus in the constellation Leo the Lion.
   The Moon is situated between Venus and Mars and Mercury such that you are able to see the Moon and Venus within one field of view with binoculars, and by shifting your view lower then be able to see the Moon with Mars and Mercury within that field of view.

   
   
   

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.

September Moon at Ascending Node

   Sunday September 17th the waning crescent Moon will be crossing the plane of the ecliptic moving north relative to the ecliptic. 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 September 17th the thin 26.5-day old waning crescent Moon will be within the constellation of Leo the Lion. The Moon will be located about 6o from Venus, and about 9o from the heart of the Lion, the star Regulus. A few more degrees further east from Venus and Regulus (below, as they rise in the morning), is the ‘Red Planet’ Mars, and nearby is the innermost planet Mercury.
   These two planets are close enough for both to be seen in the field of view of binoculars.

   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)

Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

Moon Gets Stung – Sort of


   Saturday morning September 16th the thin waning crescent Moon will be 2-3o from the open star cluster M-44, or as it more commonly known the Beehive Cluster. This should make for a great view using 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.

Moon – Dwarf Planet Ceres Conjunction

   Friday morning September 15th the waning crescent Moon will be within about 6o from the dwarf planet Ceres. Ceres should be just visible with binoculars with an apparent magnitude of between 7th and 8th. Within the binocular field of view, about 3o above Ceres is 3rd magnitude kappa Geminorum. And about 5o from Ceres is the star Pollux, one of the ‘Twin’ stars in Gemini the Twins.

   
   
   

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.

August Perigee Moon

Our Moon reaches perigee, (closest distance to Earth), for this orbit on Friday August 18th. At that time the Moon will be at a distance of 28.70 Earth diameters (366,121 km or 227,497 miles) from the Earth.
   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*

   On the day of the perigee Moon the 26-day old thin waning crescent Moon is above the eastern horizon about 30 minutes to an hour before the Sun rises. The inner planet Venus (-3.97 apparent magnitude) is within about 9o from the Moon while the Dwarf Planet Ceres, at an apparent 8th magnitude is too dim to be visible to the naked eye, is about 8o from the Moon.

   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

Taurus Head-Butts the Moon


   Wednesday morning August 16th the 24-day old waning crescent Moon is within 2-3o from the reddish star Aldebaran and the rest of the stars of the open star cluster the Hyades, forming the v-shaped face of Taurus the Bull.

   
   
   With 10×50 binoculars the Hyades and the Moon will all fit within the field of view as this 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.

Thin Waning Crescent Moon in Conjunction with Venus


   Thursday morning July 20th watch for the thin 26-day old waning crescent Moon to be within 2-3o from the inner planet Venus as both rise a couple of hours before sunrise. The reddish star Aldebaran in Taurus the Bull will be about 10o from the Moon.
   Venus and the Moon will fit nicely 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.