If you think my answer is questionable, write yourself a note, do the research and let me know if I’ve erred. Thanks in advance,
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 in the App Store.
On Monday, December 24, 2018, our Astronomy Challenge was about Stars in History.
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 Periscope’s “ Let’s talk astronomy” 8 am (Eastern US time) on Mondays.
Correct Answers……..Periscope Winners:
Thuban, gamma Draconis………. @johnnyboy2222: The Earth’s wobble causes a precession of the pole star, cycling over a 25,800 year period. 4, 800 years ago, Earth’s North Celestial Pole (NCP) was near Thuban, a magnitude 3.7 star, a Type A0 giant 290 light years away.
88 constellations…………@crackback1: The international Astronomical Union established 88 constellations in 1922. There are 48constellations from ancient Greeks, the Dutch added 12 more in the 16th century and 14 more were added in the 1750s
Matthew…….. @ tiki: Why is this part of the story only in one of the gospels?
Polaris……….@joelschultz: Polaris at declination 89 degrees, 15 minutes and 50.8 seconds, A magnitude 2.0 Type F supergiant, Polaris is about 820 light years. It’s a Cepheid variable with a 4 day period. Polaris will be closest to the NCP in the year 2100 at onle a half degree,
Supernova….………@Atheist: Supernovae also seen by Chinese astronomers. What happened to that SN? Check out the Crab Nebula, M1.
Supernova …………..@rossm3838: At magnitude -4, this guest star was visible for 6 months. It was a Type 1 Supernova
Arcturus and Sirius…………@tiki and @Dennis718: proper motion is the motion of a star across our sky.
61 Cygni…………..NO ONE GOT THIS ANSWER: 61 Cygnus by Friedrich Bessel in 1838.. This German astronomer also determined in 1844 that Sirius has a secondary companion.
Cepheid variables…………..@Camerojeff599: Leavitt worked at the Harvard College Observatory. In particular, she studied Cepheids n the Small Magallanic Cloud. (SMC)
Globular Clusters…………..@Pircano: Shapely discovered that the GCs included Cepheid variable stars. Using the Period Luminosity Law (see number 9 above) , he determined that our home galaxy is larger than most thought it was. Shapley also determined that our solar system is some distance from galactic center . He hung onto the idea that the “spiral nebulae” were small and nearby, within the Milky Way Galaxy.
Edwin Hubble…………..@Pircano: Using the 100 inch telescope at Mount Wilson Observatory