Jupiter Has 2 More

   Outer planet Jupiter has probably more moons than have been counted so far. The greater majority of these satellites of Jupiter orbit in retrograde relative to the rotation direction of the planet. Satellites of any planet that orbit their ‘parent’ planet in retrograde are called irregular satellites to distinguish them from satellites that formed with the planet, and consequently would orbit in the same direction as the planet’s rotation.
   Two recently discovered satellites, bringing the known or at least suspected number to 69, are described via their respective URL with a very official looking but somewhat confusing at first glance bulletin. The links are to the MPEC (Minor Planet Electronic Circular) at the Minor Planet Center.
   Both of these satellites were discovered or co-discovered by Astronomers Scott Sheppard, David Tholen, and Chadwick Trujillo. Given the small size and challenges in imaging these satellites it is amazing that they were discovered. Read more about the discoveries at Sky & Telescope‘s web site.

    MPEC 2017-L47 : S/2017 J 1 click here
    MPEC 2017-L08 : S/2016 J 1 click here

       Take a tour around Jupiter and its many satellites. The sizes of the Galilean satellites, Io, Europa, Ganymede, and Callisto have been made larger than they would actually be given the size Jupiter used in the video.

       
       
       

    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.

ISS Followed the Arc

   Last evening, Sunday June 11th the ISS, International Space Station orbited over my part of the world. The ISS appeared about 45o above the west-northwest horizon and followed a path that went below the bowl of the Big Dipper and in a straight line ‘followed the arc to Arcturus’ in the constellation Bootes the Herdsman. At its peak the ISS reached nearly the zenith and at its brightest had to be at least -3.0 in apparent magnitude. After a several minutes the ISS moved out of sunlight and faded from view above the southeastern horizon.
Camera settings were 18mm; ISO 800; F4.0; 2 sec.
   One dependable and accurate source of viewing information for the ISS is at NASA’s ISS Sightings web site. Here you may learn the time and direction the ISS will appear, its duration of visibility, and its time and direction it will stop being visible.

   In a similar manner the Heavens Above web site will also provide viewing information for the ISS but in addition it will display a star map showing the path across the sky. This sample graphic shows the ISS path for June 12th.

   Want to see what the Earth looks like from the ISS? Click on this link to go to the ISS HD Earth Viewing web site for a view from one of several cameras mounted on the ISS as this screen capture shows. There are two additional maps that show the current position and orbital path of the ISS.
   
   
   

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.

ISS Last Night

   Last evening was my first opportunity to see the ISS in at least a month so I quickly set up my camera aiming it toward Venus and Mars. However my aim was off by quite a bit so I hurriedly readjusted the camera, 3 times, to capture these pictures. All were taken with ISO 800; F5; 18mm; 2.5 second. Pictures were stacked, merged, using Starstax.

   
   
   

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.

ISS This Morning

screenshot_20161231-065616
   This morning I braved the chilly temperature and caught the International Space Station as it orbited a little to the north over my space on the surface.

         A great way to start the end of the year!

   This graphic is a screenshot from my cellphone showing the display from ISS Detector, an extremely useful APP for Android and IOS and tablets like my Kindle Fire.
   
   
   

   The track across the sky lasted about 7 minutes. It started in the west and then followed a path between the two ‘Dippers’ passing the Pointer Stars in the Big Dipper on the way toward Polaris, the North Star.

   
   
   Camera Settings: 18 mm; 3.5 sec. F5.6; ISO 1600

   
   
   

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.

ISS This Evening

   Despite a temperature of 6oF and standing in a couple of inches of snow it was worth it as Venus and Mars shined brightly over my neighbor’s laser light show and I waited patiently for an ISS orbit over my home this evening. This orbit had the International Space Station rising in the northwest and setting in the southeast in a 6-minute visibility that took it nearly to the zenith with its maximum altitude of 85o above the horizon. It’s orbital track had the ISS pass along one side of the ‘Summer Triangle’, the stars Vega and Deneb. As it nears the zenith the ISS will pass very close to the star Alpheratz, the upper left corner star of the asterism “Square of Pegasus”. Alpheratz is actually a star in the constellation of Andromeda the Princess, but it it is commonly used to complete the ‘Square of Pegasus” asterism.

   Camera settings were 18mm; ISO 800; F6.0; 3.2 sec. Pictures stacked using StarStaX. StarStaX is available as Freeware for Mac OS X, Windows and Linux.

   
   
   

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.

ISS This Evening

   This evening, Thursday December 1st, the International Space Station, ISS, did another orbit over my part of the world as it first appeared in the southwest near the setting waxing crescent Moon. It climbed to nearly straight overhead as it passed by the stars of Delphinus the Dolphin, Sagitta the Arrow, and Deneb in the Cygnus the Swan, until it passed out of my camera’s field of view. I continued to watch it cruise past the stars of Cassiopeia the Queen high over the northeast horizon.

   This was my first time for seeing the entire flyover from when the ISS appeared in the southwest until it faded out near Cassiopeia. Pretty cool.
   Camera settings: 21 stacked pictures at 18mm; ISO 1600; f3.5; 3.5 sec; at 2 second intervals.
   

   
   
   

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.

ISS This Morning

   This morning at approximately 5:42 am CST the International Space Station had a brief 3-minute flyover of my part of the world. It first appeared high over the northwest horizon and quickly passed the bowl of the Big Dipper coming close to Merak, the bottom front star making up the Big Dipper’s bowl. Look closely at the next to last line from the right. That is the stars of Coma Berenices (Berenice’s Hair), a small constellation named after Queen Berenice, one of the wives of Ptolemy III, of ancient Egypt.
   Less than a minute later, if that much, the ISS was setting in the southeast as it passed by Jupiter.
   Each picture is a stacked composite of several pictures. Camera was set to ISO 1600; F5.6; 3.2 seconds; 18mm.

   
   
   

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.