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#NASASocial #ToBennuAndBack

Asteroid Terms: Explained

There are interesting asteroid characters in our solar system, including an asteroid that has its own moon and even one that is shaped like a dog bone! Our OSIRIS-REx mission launches at 7:05 p.m. EDT today and will travel to asteroid Bennu.

Scientists chose Bennu as the target of the OSIRIS-REx mission because of its composition, size and proximity to Earth. Bennu is a rare B-type asteroid (primitive and carbon-rich), which is expected to have organic compounds and water-bearing minerals like clays.

Our OSIRIS-REx mission will travel to Bennu and bring a small sample back to Earth for study.

When talking about asteroids, there are some terms scientists use that might not be in your typical vocabulary…but we’ll help with that!

Here are a few terms you should know:

Orbital Eccentricity: This number describes the shape of an asteroid’s orbit by how elliptical it is. For asteroids in orbit around the sun, eccentricity is a number between 0 and 1, with 0 being a perfectly circular orbit and 0.99 being a highly elliptical orbit.

Inclination: The angle, in degrees, of how tilted an asteroid’s orbit is compared to another plane of reference, usually the plane of the Earth’s orbit around the sun.

Orbital Period: The number of days it takes for an asteroid to revolve once around the sun. For example, the Earth’s orbital period is 365 days.

Perihelion Distance: The distance between an asteroid and the sun when the asteroid is closest to the sun.

Aphelion Distance: The distance between the asteroid and the sun when the asteroid is farthest away from the sun.

Astronomical unit: A distance unit commonly used to describe orbits of objects around the sun. The distance from the Earth to the sun is one astronomical unit, or 1 AU, equivalent to about 93 million miles or 150 million kilometers.

Diameter: A measure of the size of an asteroid. It is the length of a line from a point on the surface, through the center of the asteroid, extending out to the opposite surface. Irregularly shaped asteroids may have different diameters depending on which direction they are measured.

Rotation Period: The time it takes for an asteroid to complete one revolution around its axis of rotation. For example, the rotation period of the Earth is approximately 24 hours, or 1 day.

Spectral Type: The classification of an asteroid, based on a measurement of the light reflected by the asteroid. 

Watch live launch coverage of OSIRIS-REx to asteroid Bennu starting at 5:30 p.m, on NASA TV: http://www.nasa.gov/nasatv 

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Buster the Atheist Pug returns to demolish a creationist's 'testimony'

Solar System: From TED Talks to Data Releases

Let us lead you on a journey of our solar system. Here are some things to know this week:

1. NASA-Funded Research

It’s all just a click way with the launch of a new public access site, which reflects our ongoing commitment to provide public access to science data.

Start Exploring!

2.  Red Planet Reconnaissance 

One of the top places in our solar system to look for signs of past or current life is Mars. Through our robotic missions, we have been on and around Mars for 40 years. These orbiters, landers and rovers are paving the way for human exploration.

Meet the Mars robots

3. Three Moons and a Planet that Could Have Alien Life

In a presentation at TED Talks Live, our director of planetary science, Jim Green, discusses the best places to look for alien life in our solar system.

Watch the talk

4. Setting Free a Dragon

Tune in to NASA TV on Friday, Aug. 26 at 5:45 a.m. EDT for coverage of the release of the SpaceX Dragon CRS-9 cargo ship from the International Space Station.

Watch live

5. Anniversary Ring(s)

Aug. 26 marks 35 years since Voyager probe flew by Saturn, delighting scientists with rich data and images. Today, thanks to our Cassini spacecraft, we know much more about the ringed planet.

Learn more about Cassini’s mission to Saturn

Learn more about Voyager 2

Discover the full list of 10 things to know about our solar system this week HERE.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Successful Launch of Orbital ATK’s Cygnus Spacecraft

Successful Launch, #FlatEarth crowd!

At 11:05 p.m. (EDT) on March 22 the Atlas V rocket successfully lifted off from Cape Canaveral Air Force Station, Florida.

  Included in the 7,500 pounds of cargo aboard the Orbital ATK Cygnus spacecraft are numerous science payloads to support experiments in biology, biotechnology, physical science and Earth science.  (more…)

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Videos recorded live #ReasonRally in Washington DC are being processed and uploaded as quickly as possible. Subscribe to be alerted to new uploads!

I got bored and went digging through the box of tubes again... Found a nice looking 6F6 GT and a 6Y6 GT, and kind of ran off in high spirits and decided a little broadcast band receiver would be a fun project. For this project I wanted them outside the box (CD case) where I could see 'em. Mounted all the heavy components. (back-to-back Radio Shack 12V CT transformers to make what amounts to an isolation transformer, picking off filament power between the two... Audio output transformer...) I haven't even decided if it's going to be a regenerative or something that requires less fussing with during operation. Any suggestions, anyone?

SDHoS Attends Fundraiser for The Jeremy Fund

SDHoS Attends Fundraiser for The Jeremy Fund

Tonight we are not debunking anything. This will come as a surprise to our regular readers, since we normally spend our time refuting the claims of flat-earthers, conspiracy theorists, science deniers and such.

On Tuesday, June 28th, two representatives from Science Denier Hall of Shame attended a pasta dinner fundraiser for The Jeremy Fund.

I would urge all of our readers to take a look at their…

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Tri-State Freethinkers warn Youngstown City School District

May 23, 2016 For Immediate Release Tri-State Freethinkers warn Youngstown City School District: Intelligent Design has no place in classroom

Cincinnati, OH – Tri-State Freethinkers have written a letter to Interim Superintendent, Stephen Stohla, regarding a lesson plan discoveredon their school district web server that directs students in the study of Intelligent Design and its contrast to…

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