March 2018 - Utah-Astronomy - mailman.xmission.com

Re: [Utah-astronomy] Last night's lecture
by Joe Bauman 11 Dec '18

11 Dec '18

Brent, speaking of the ISS, I have wondered if it could be put into an orbit that continuously cruised between Earth and Mars. When it swung by Mars it could drop off and retrieved crews. I don't see how the radiation would be any worse than the ISS crews are already exposed to. ------------------------------ On Wed, Feb 25, 2015 8:18 AM MST Brent Watson via Utah-Astronomy wrote: >I attended the lecture last night on trajectories. It was really a good, stimulating talk. Thanks for passing the word along. >There were some interesting side comments made about our launch capabilities and the Mars One effort. Mr. Adamo was not at all enthusiastic about the Mars One effort. His opinion is that the effort is doomed because there is not really a way to assure that folks going there would be safe - primarily from radiation. He has done some work with a former flight surgeon on designing a spacecraft to go to Mars. Their result is that in order to get sufficient shielding (using a water jacket), the spacecraft's mass would be around 380 metric tons. That is for a small crew, probably only about 5 members. For a point of comparison, the ISS mass is 400 metric tons. He made the comment that an astronaut who made this trip could only go to space once in this craft, and then he would be at the limit of radiation exposure for his life. The NASA limit is an increased risk of developing cancer of 5%. >That brings us to our current launch capability. Our latest heavy lift rocket - the one we are currently developing - will have the capability to lift 130 metric tons to a very low earth orbit. So low, in fact, that it would burn up at perigee. The Apollo 17 Saturn 5 rocket lifted 140 metric tons into earth orbit -- higher than the new rocket will go. (I am sorry, but my mind will not allow me to recall the name of our currently being designed rocket.) Recall that it took several dozen shuttle launches to assemble the ISS. The Mars One vehicle would require either a hugely more massive launch rocket or a similar effort to build the craft. >As I mentioned, it was a very intellectually stimulating lecture and did involve several ordinary differential equations. They were nicely explained in English by Mr. Adamo. This was the first time I have seen some real math put to Kepler's laws. There were many charts showing what it takes to leave the earth and go to the moon or Mars. It was a very well done lecture. >The above is my recollection of the lecture, and may not actually represent the opinions of Mr. Adamo. It is only my interpretation of what he said. He knows his stuff, that is apparent. Thanks Patrick and Dr. Sohl for passing the word along. >_______________________________________________ >Utah-Astronomy mailing list >http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy > >Send messages to the list to >Utah-Astronomy(a)mailman.xmission.com > >The Utah-Astronomy mailing list is not affiliated with any astronomy club. > >To unsubscribe go to: >http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy >Then enter your email address in the space provided and click on "Unsubscribe or edit options".

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Blog home
by Joe Bauman 27 Mar '18

27 Mar '18

The first time didn't work, so I'm resending the URL for my blog's home in case you have acquaintances who might like a free subscription. It's http://the-nightly-news.com/ Thank you, Joe Bauman

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Jupiter
by Joe Bauman 27 Mar '18

27 Mar '18

Dear friends of astronomy, The Juno spacecraft has returned surprising discoveriesabout the solar system’s largest planet, Jupiter. Please read about them in mylatest blog, http://the-nightly-news.com/blog/blog-45-new-findings-by-jove Also, could you send a link to others who may be interestedin subscribing? The home page is here: Home. Thank you, Joe

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Stephen Hawking
by Joe Bauman 18 Mar '18

18 Mar '18

http://the-nightly-news.com/blog/blog-44-remembering-stephen-hawking

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A Tribute to Stephen Hawking
by Rodger C. Fry 13 Mar '18

13 Mar '18

All, It sad to hear that Stephen Hawking passed away today. He will go down as one of the most brilliant men of all time. Thanks to Stephen for his contribution to science. Rodger C. Fry

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first night out this year
by daniel turner 13 Mar '18

13 Mar '18

With the warm dry weather for the past week, the snow and mud are gone from the west desert. A clear sky forecast made the case for an observing session so I took my 10x50 binoculars along with a bundle of firewood, it's still chilly at night. Venus and Mercury were very bright at sunset and as the sky darkened the zodiacal light became very prominent as it reached up to meet the milky way at the Pleiades. Andromeda galaxy and M81 were visible to the unaided eye. It was a stunningly clear and dark night. I was buzzed by a pair of F35 fighter jets. These guys are much faster and quieter than the of F16's I usually see on night maneuvers. Also off to the north was activity from low flying Apache helicopters. I let the fire burn to coals so it wouldn't swamp my dark vision, and saw the Coma Stars behind Leo and even the toe of Hercules in the mouth of Draco. It was good and dark clear to the ground and I saw Hydra, Corvus, and Crater rising over the glow of the cities to the east. At midnight the fire was out and the night chill brought a thin dew fall so I packed up and headed home. A Great Time DT

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TESS
by Joe Bauman 08 Mar '18

08 Mar '18

Hi Friends, Here's my latest blog, about an exciting planet-hunter that may be launched next month. Thanks, Joe http://the-nightly-news.com/blog/blog-43-kepler-times-400

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Fw: Celestron 10" Newtonian OTA Special, $399. There are only four available.
by Thomas Sevcik 02 Mar '18

02 Mar '18

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