Nebula Images: Http://nebulaimages.com/

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 

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SpaceX Lands the Falcon9 First Stage - A revolution in Rocket Science and Engineering

Today, at 8:33, Spacex made history. They landed the first stage of their Falcon9 rocket after having it successfully deploy a second stage into low earth orbit.

The Video is here:

Unlike other rocket companies, Spacex in not making small hops - they did that 2 years ago with their grasshopper rocket. In fact, this is how they tested the initial avionics systems that would be able to land the rocket in a stable position autonomously. Here is some footage:

Unlike the companies that make these hops, Spacex has to use this stage to help get payloads into low earth orbit… and then recover it! This is incredibly difficult and requires an advanced retro-thrusting maneuver that has never been successful - until now! The diagram below shows this thrusting maneuver, which happens shortly after the second stage has decoupled and ignited.

Spacex claims that this is similar to throwing a pencil over the Empire State Building, then having it flip perfectly, then haveing it fall into a shoebox… easy enough right?

Only, in real life SpaceX isn’t shooting a pencil… they are shooting a rocket! This is the pad that the now famous falcon9 rocket landed on:

Now you might ask, why does this matter? This means space will become cheaper! We can already build satellites that are less than $10,000, as a matter of fact I’m building a small satellite with a team right now! As it currently stands, space travel is too expensive for creative people to take risks. Now, thanks to SpaceX, we may be mining or visiting asteroids, visiting the moon, visiting mars, or doing something crazier - and we may be doing this very soon! The Falcon9 rocket costs $54 million to build but only $200,000 to refuel… let’s put this in perspective… That’s the same amount that it costs to refuel a Boeing 747 (which is the airplane that consumers use to fly around the world). This means that space travel could be as cheap as air travel very soon! Way to go SpaceX!

If you want to watch the full launch and landing video check it out here (this may be moved in the future): http://www.spacex.com/webcast/

Credit: SpaceX

Hat’s off to SpaceX for releasing footage of their attempt to safely land their first stage on a barge so they could reuse it.  The fact that they hit a barge in the middle of the ocean at all is pretty incredible.  Their ultimate goal is to soft land it so they can reuse their rocket engines.  Of course, the engines would have to be refurbished between every shot, but this could end up being an incredible cost savings for low earth orbit resupply missions.  When you watch this video, don’t think about how much money this cost to not work…. but how much future savings something like this could represent!

https://vine.co/v/OjqeYWWpVWK

Thanksgiving...in Space

Since 2000, humans have continuously lived and worked on the International Space Station. That means plenty of crew members have celebrated holidays off the Earth.

Although they’re observing the same holidays, they do so in a slightly different way because of the unique environment 250 miles above the Earth.

Consider the differences of living on Earth and in space…

Food scientists must develop foods that will be easier to handle and consume in an environment without gravity. The food must not require refrigeration and also provide the nutrition humans need to remain healthy.

Freeze drying food allows it to remain stable at room temperature, while also significantly reducing its weight.

Did you know that all the food sent to the space station is precooked? Sending precooked food means that it requires no refrigeration and is either ready to eat or can be prepared by simply adding water or by heating. 

The only exception are the fruit and vegetables stowed in the fresh food locker. The food comes in either freeze-dried containers or thermostabilized pouches. If freeze-dried in a vacuum sealed package, the astronauts have a rehydration system in-flight, which they use restore moisture in their food.  If thermostabilized, the packaging is designed to preserve the food similar to canned products, but instead in a flexible, multi-layered pouch.

So what will the space station crew eat this year (2016) for Thanksgiving?

Turkey

Cherry/Blueberry Cobbler

Candied Yams

Rehydratable Cornbread Dressing

Rehydratable Green Beans and Mushrooms

Rehydratable Mashed Potatoes

What are you bringing to Thanksgiving on Earth this year? Treat your family and friends astronaut-style with this cornbread dressing recipe straight out of our Space Food Systems Laboratory…no freeze drying required!

For spaceflight preparation:

Baked dressing is transferred to metal tray and freeze-dried accordingly. One serving of cornbread dressing shall weigh approximately 145 g prior to freeze-drying and 50 g after freeze-drying.

Learn more about our Food Systems Laboratory in this Facebook Live video: https://www.facebook.com/ISS/videos/1359709837395277/

Happy Thanksgiving!

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What’s Up for October 2016?

What’s Up for October? Moon phases, Astronomy Day, meteors and Saturn!

The new moon phase starts the month on October 1. Of course, the new moon isn’t visible, because it’s between Earth and the sun, and the unlit side is facing Earth. 

Night by night the slender crescent gets bigger and higher in the sky and easier to see just after sunset. On the 3rd and 4th, the moon will pass just above Venus!

A week later on the 9th the moon has traveled through one quarter of its 29-day orbit around Earth, and we see the first quarter phase. Also look for Mars just below the moon.

Join us in celebrating International Observe the Moon Night Saturday, October 8th, with your local astronomy club or science center. Conveniently, the 8th is also Fall Astronomy Day, celebrated internationally by astronomy clubs since 1973.

One week later on the 16th the moon reaches opposition, or the full moon phase, when the moon and the sun are on opposite sides of Earth. And the sun completely illuminates the moon as seen from Earth. 

During this phase, the moon rises in the east just as the sun is setting in the west. Overnight, the moon crosses the sky and sets at dawn.

A week later, on the 22nd of October, the last quarter moon rises at midnight. Later, the pretty and bright Beehive Cluster will be visible near the moon until dawn.

To wrap up the month, 29 days after the last new moon we start the lunar cycle all over again with another new moon phase on October 30th. Will you be able to spot the one-day old moon on Halloween? It will be a challenge!

There are three meteor showers in October–the Draconids, the Taurids and the Orionids. Try for the Draconids on October 8th.  

See the Taurids on October 10th. 

The Orionids will be marred by the full moon on the 21st, but all three meteor showers will offer some possible bright meteors.

Finally, you’ll have an especially pretty view of Saturn, when it forms a straight line with Venus and the red star Antares on the 27th.

You can catch up on NASA’s lunar mission, the Lunar Reconnaissance Orbiter, the Cassini Mission to Saturn and all of our missions at www.nasa.gov.

Watch the full October “What’s Up" video for more:

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