Have You Seen Jupiter Lately?

Have You Seen Jupiter Lately?jupiter_1077442_U_000

Today we have seven questions, so we will take ten minutes to complete the quiz today.

With that in mind, ladies and gentlemen, please get out a clean sheet of paper and a No. 2 pencil and prepare for today’s Astronomy Pop Quiz.

DMG procedures and expectations apply; 1) if you find a mistake, please let me know, and b) do your best.

The topic today: Jupiter

You have ten minutes to complete the quiz. Begin now.


  1. This morning (Monday, August 20, 2018) at 13:01 Universal Time (9:01 am eastern time) a moon is going to transit a planet. Which planet?

  1. Name the moon that will transit the face of Jupiter in a few minutes.  

  1. At UT 13:16 we could see two moon shadows on Jupiter. One is the shadow of Europa (#2 above.) What moon is causing the second shadow?

  1. Who first saw the four largest moons of Jupiter?Screen shot 2015-01-10 at 1.07.26 AM

  1. Name the largest (size) of the four Galilean moons.

  1. Which of Jupiter’s Galilean moons is turned inside by the tidal forces with Jupiter?

  1. Today, Jupiter is within one degree of the brightest star in which constellation?

OK, pencils down. Let’s trade with a neighbor and check one another. Here are the correct answers and your “neighbor” who got the correct answer on my Periscope broadcast on August 13, from 8:00 am (eastern US) to 9:00.

Make the World a Better place!

A player who is the first to give the correct answer on the live-show is a winner. Winners who make a contribution to one of my charities in the next 30 days will have the gift matched by me up to $100. My charities are listed on my blog.     Tell the charity to contact me about your contribution.

Link here to my blog “An Island in the Sea of Mystery.”


You are welcome to play with us during the next live broadcast of

“Let’s talk astronomy” this coming Monday beginning at 8 am eastern US time on Periscope.

Periscope is a live video streaming app for Android and iOS available inScreen shot 2015-12-28 at 8.16.26 PM the App Store.

On Monday, August 20, 2018, our Periscope Trivia Contest was about Jupiter.

The questions are given above, the correct answers and the winners are given below.

Congratulations to all winners and thank-you to all participants.

Play live on Let’s talk astronomy” 8 am, Mondays

Correct Answers……..Periscope Winners:

  1. Jupiter………. @Steelman_MJW: Is Jupiter the only planet for lunar transits?

  1. Europa…….. @philipmatthew: For this moon to transit Jupiter just about every orbit, might tell us something abut the orientation of the orbital planes.

    Europa at UT 13:01 Europa transits Jupiter about every four days. The orbital period of Europa is 3.55 days. Coincidence?

  1. Io….………@Pircano:  Double shadows on Jupiter are very cool.

  1. Galileo…………….@Steelman_MJW: in 1609, published in 1510

  1. Ganymede………..@Abir_Stitou: Largest: Ganymede at 5262 km, Callisto (4821),   Io (3643),   Europa (3122)  Ganymede, the largest moon of the Solar system, has a diameter larger than the planet Mercury.

  1. Io………………@philipmatthew: Voyager 1 discovered eight volcanos on this moon, Voyager 2 saw two more. Observations indicate continuous eruptions since then.

  1. Libra…………..@Cedrickbk:   Alpha Libra mag 3.25v, 290 LY distant. Jupiter will be in Libra until late November. Then it will move thru a tiny wedge of Scorpius to mid December, and enter the 13th constellation of the Zodiac, Ophiuchus.

Thanks to the Observer’s Handbook 2018 from The Royal Astronomical Society of Canada. To order a copy visit


Thanks goes out to all participants, and Congratulations to everyone who got one right.


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