Skytour Radio – Hidden In Plain Starlight
March 4th, 2018
In this episode of SkyTour Radio, we delve deeper into the possibilities of Earth like exoplanets in the universe as we discussed last week with Super-Earths such as Kepler 452 b.
We also examine the why new found stars are categorized by looking at the Henry Draper catalogue and one particularly promising star system, HD 7924as well as the Gliese Jahreiss catalogue and one of it’s most encouraging star system GJ 9827.
Henry Draper Catalogue
Giving the spectroscopic classifications for over 359,083 stars as of August 2017, this astronomical star catalogue covers the entire sky almost completely down to an apparent photographic magnitude of about 9; the extensions added fainter stars in certain areas of the sky. The construction of the Henry Draper Catalogue was part of a pioneering effort to classify stellar spectra, and its catalogue numbers are commonly used as a way of identifying stars.
A 7th magnitude K-type main sequence star located approximately 55 light years away in the constellation Cassiopeia, this star is smaller, cooler, dimmer, and less massive than our Sun.In 2009, a super-Earth exoplanet was found in orbit around the star, and in 2015, two more planets were discovered.
Gliese Jahreiss Catalogue
The Gliese Catalogue of Nearby Stars is familiar to astronomers and the extension to the Gliese catalog added many more stars than the original 915. The GJ catalog is a modern star catalogue of all known stars to 22 parsecs (72 ly), which catalogued 1,529 stars listing their known properties and ordered geographically by right ascension. the Third Catalogue of Nearby Stars was published in 1991, containing information on 3,803 stars and although this catalogue is designated as preliminary it is still the one in current use.
a K-type main-sequence star with an apparent magnitude of 10.250, it is 99 light-years (30 parsecs) away, based on parallax and is located in the constellation of Pisces.
It has 3 transiting planets and as of October 2017, it is the closest star discovered to have transiting exoplanets found by either the Kepler or K2 missions.
Due to its close distance the system is considered an excellent target for studying atmospherics of exoplanets.
We will also be discussing the magnitudes of stars, how to decipher the information it gives us and how to gain a better understanding of what these systems are telling us. We will also do some crazy comparisons to show just how bright stars can be. Plus a few more fun forays.
So come join us as we go LIVE March 4th at 9pm EST. You can tune in on http://kgraradio.com or join the discussion in the listener lounge. http://kgraradio.com/chat
SkyTour Radio explores the Universe in a down to Earth manner explaining the science we know in fun and bite-sized terms. Science is for everyone and people shouldn’t require an advanced degree to understand as long as it is delivered in an easy to follow way. From Black Holes to Extraterrestrial Life, we will explore the Universe like never before. Join us to check out such things as how stars form, how they live and, how our fate is intertwined with theirs. On the extraterrestrial life front, we will be speaking to the UFO and science arena’s top researchers and bring UFOlogy into the 21st century.
Skytour Radio Broadcasts LIVE every Sunday starting at 9pm EST. Tune in on http://kgraradio.com or join the discussion by going to http://kgraradio.com/chat Don’t forget you can find out more information, see show updates and get more information on the Sky Tour Radio show page. http://kgraradio.com/skytour-radio/