Radar images from May 30, 2012 of Asteroid 1998 QE2, showing its binary companion. Credit: NASA.

Surprise! Earth Passing Asteroid 1998 QE2 Has a Moon

Article Updated: 23 Dec , 2015

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Late yesterday, NASA turned the 230-foot (70-meter) Deep Space Network antenna at Goldstone, California towards Asteroid 1998 QE2 as it was heading towards its closest approach to Earth, and they got a big surprise: the asteroid is a binary system. 1998 QE2 itself is 1.7 miles (2.7 kilometers) in diameter, and the newly found orbiting moon is about 600 meters in diameter.

The radar images were taken were taken on May 29, 2013, when the asteroid was about 3.75 million miles (6 million kilometers) from Earth.

“Radar really helps to pin down the orbit of an asteroid as well as the size of it,” said Paul Chodas of NASA’s Near-Earth Object Program office, speaking during a JPL webcast about this asteroid on May 30. “We now know our size estimates were pretty good, but finding it was a binary was surprising.”

NASA said that about 16 percent of asteroids are binary or even triple systems.

Each of the images above are snippets of about 5 minutes of radar data. You can watch a movie of the data, below:

Other surprises were several radar-dark features, which may be cavities or impact craters, said Marina Brozovic, a scientist at JPL. The asteroid is also rotating more slowly than originally thought.

Near Earth Asteroid (NEA) 285263 (1998 QE2) will pass 5.86 million km from the Earth on Friday, May 31st at 20:59 Universal Time (UT) or 4:59PM EDT. This is the closest approach of 1998 QE2 for this century, and it poses no threat – and there’s not any threat in the future – as it is passing over 15 times as distant as the Earth’s Moon. But the rather large size of this space rock makes it an object of interest for astronomers.

Chodas added that they will continue to take radar data of this asteroid while they can to improve its orbital parameters, and that the presence of the moonlet means they can get an even more precise mass estimate of the asteroid.

Want to try and see this asteroid for yourself? Our very own David Dickinson has written a great “how-to” for this object, but you are going to need a fairly large backyard telescope, since it will be about 100 times fainter than what can be seen with the naked eye, even at closest approach.

The Slooh online telescope will have views of online tomorrow, which you can watch at their website. The webcast will start at 20:30 UTC (4:30 p.m. EDT) on Friday, May 31.

Also, starting at 20:00 UTC (4:00 p.m. EDT), astrophysicist Gianluca Masi will have a webcast from the Virtual Telescope Project in Italy.

Additionally, if you want to have a Bruce Willis-type view of this asteroid, check out NASA’s Eyes on the Solar System. They have a special feature on this asteroid, and you can “ride along with it for the next few days,” said Doug Ellison, Visualization Producer at JPL, speaking during the webcast.

This amazing tool creates realistic simulated views based on real data, and allows you to travel to any planet, moon or spacecraft across time and space, in 3D and in real time — or speed up to see the future.

Just go to the Eyes on the Solar System website, and when the window opens, click on “Tours and Features” in the upper right hand corner, then click on “1998 QE2” in the dropdown box, and away you go. If you click on the “Live” button the left, you’ll see the current location; click on “Ride Along” and find yourself sitting on the asteroid heading towards Earth.

At the bottom control panel “dock” (click on the bottom box on the lower right side if the panel isn’t showing), you can speed up time and see how far from Earth this asteroid will get and where it will go in the future.

Ellison added that right now the imagery on Eyes on the Solar System doesn’t have the moonlet orbiting 1998 QE2, but they will be adding it soon to make the visualization as realistic as possible.

NASA’s @AsteroidWatch Twitter account shared the news about the moon:

Also, if you want more asteroids, on Friday May 31, the White House is hosting an asteroid-themed “We the Geeks” Google+ Hangout starting at 2 p.m. EDT.

The live video conference will feature Bill Nye the Science Guy, former astronaut Ed Lu, NASA Deputy Administrator Lori Garver, and Peter Diamandis, co-founder of asteroid mining company Planetary Resources. They will discuss identification, resource potential and threat of asteroids. Here’s the link the White House’s Google+ page.

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Minor Planet Center
Guest
Minor Planet Center
May 30, 2013 7:24 PM

“Near Earth Asteroid (NEA) 285263 (1998 QE2) will pass 6.2 million kilometers from the Earth”

A little typo there, Nancy: 1998 QE2’s closest approach will be ~5.86 million km away.

—JL Galache
Minor Planet Center

Ben Bernanke
Guest
Ben Bernanke
May 30, 2013 9:06 PM

Please change orbit and hit the federal reserve building. The only way to end QE is for an asteroid to hit Bens printing presses. Paul Krugman will be happy, while it may not be the alien invasion he was looking for to stimulate GDP growth, this should do nicely as a substitute. We should get at least 100 points on the DOW and 50 on the S&P if this even occurs.

DurkaDurka
Guest
DurkaDurka
May 30, 2013 10:06 PM

So, that’s not good. So near Earth asteroid is now Nearer Earth Asteroid.

Aqua4U
Member
May 30, 2013 11:40 PM

Any spectroscopy available for QE2 and partner? Simple chondrite rock(s)? The moonlet appears to have high reflectivity… an icy body?

Minor Planet Center
Guest
Minor Planet Center
May 30, 2013 11:57 PM

No spectroscopy that I’m aware of, certainly not of the moon. We do know it’s a VERY dark asteroid—tit only reflects 6% of the visible light hitting it.

The moon appears bright in the radar images because it’s probably rotating very slowly.

—JL Galache
Minor Planet Center

steph mcd
Guest
steph mcd
May 31, 2013 4:38 PM

A litle typo there, JL. “…tit only reflects 6% of the visible light hitting it…” Or have you inadvertently posted some of your own private bedroom research? wink

Nexus
Member
May 30, 2013 11:53 PM

Why is the little moon so much brighter than the asteroid?

Minor Planet Center
Guest
Minor Planet Center
May 31, 2013 12:06 AM

A much longer (and better) explanation than mine by Emily Lakdawalla:

http://www.planetary.org/blogs/emily-lakdawalla/2013/05301616-say-hi-to-asteroid-1998qe2.html

Cheers,

—JL Galache
Minor Planet Center

Nexus
Member
May 31, 2013 2:32 AM

Thanks for that link. These dopplergrams always confuse me because the images sometimes look like the object and sometimes they don’t.

Bill
Guest
Bill
May 31, 2013 12:42 AM

Moons usually orbit things, they don’t go in straight lines. Are you sure it’s not shooting at us?

Richard Colby-leveymg
Guest
Richard Colby-leveymg
May 31, 2013 1:26 AM
Surprise, 1998 QE2 is a “planet” according to the In’t Astrological Union (IAU) definition. Scroll down to the bottom of the post here: http://www2.ess.ucla.edu/~jlm/epo/planet/planet.html Apparently it has sufficient mass to retain its own satellite, which is surprising. Both of them are soon to be visiting our part of the solar system. The fact that it has a moon shows that 1998 that it has “cleared its neighborhood” of other objects, and is is a full-fledged planet, according to another IAU definition: http://en.wikipedia.org/wiki/Clearing_the_neighbourhood “Clearing the neighbourhood of its orbit” is a criterion for a celestial body to be considered a planet in the Solar System. This was one of the three criteria adopted by the International Astronomical Union (IAU)… Read more »
Minor Planet Center
Guest
Minor Planet Center
June 3, 2013 2:08 PM

Richard,

There are many Near Earth Asteroids in orbits similar to 1998 QE2, so it hasn’t fulfilled that particular requirement of clearing its orbit. Being a binary asteroid has noting to do with clearing its neighbourhood.

—JL Galache
Minor Planet Center

Blahable
Guest
Blahable
May 31, 2013 3:29 AM

niburu….

Planemo
Guest
Planemo
May 31, 2013 7:47 AM

No, no , no …no , come on you guys. You all don’t know who that lil’shinny dude is napping beside that asteroid? No?
Ok, I’ll have to tell you then. He is actually none other then the most vulgar lil’alien dude in the solar system. The woman from Venus cannot get enough of the lil’alien dude. Why its the one and only “Anus from Uranus”. And you all call yourselves scientists?!

….lol…lol.

gl95
Member
gl95
May 31, 2013 1:55 PM
JonHanford
Guest
JonHanford
May 31, 2013 3:00 PM

Yes, but Tom Van Flandern’s “Exploded Planet Hypothesis” would seem to be in doubt. In light of Tom’s NEAR Challenge (“If the NEAR rendezvous with Eros [in January, 1999] shows it to be an isolated, single body, or even a simple ‘binary asteroid’, but without a debris field orbiting it, I will publicly concede before the next Division of Planetary Sciences meeting that the hypothesis leading to that prediction has failed.”) I wonder if Dr Van Flandern made good on the wager? Tom Van Flandern passed away in 2009 and mysteriously his web site has no more about the challenge or the NEAR results(AFAIK no debris fields or moons were found at Eros by NEAR): http://metaresearch.org/solar%20system/asteroids/near/NEARChallengeBackground.asp

gl95
Member
gl95
June 2, 2013 3:35 AM

Hi Jon, thanks for the thoughtful comments. I’m not here to defend what Dr. Van Flandern did, but your question seems to be addressed here: http://metaresearch.org/solar%20system/asteroids/near/NEARChallengeResults.asp

JonHanford
Guest
JonHanford
June 2, 2013 2:37 PM

Thanks for the link Glen.

1MadMax1
Guest
1MadMax1
May 31, 2013 6:22 PM

1998 QE2’s moon should be named ‘Monty’….after Queen Elizabeth’s Corgi, that recently died. Just sayin.

Isisosiris
Guest
Isisosiris
June 1, 2013 2:39 PM

Not only do this classified asteroid seem to hold a near full sphere shape … but I’m reminded of an old star wars saying … “that’s no moon, that’s a base station !” and for the celestial/alien minded having considered advance technology controlling much of what we see as reality … once an object comes into the solar system’s field of illusion, that object will appear to be any corresponding thing the illusion field is program to cast … so the visiting object could very well be a domicile space craft of some kind …

Minor Planet Center
Guest
Minor Planet Center
June 3, 2013 2:33 PM

Then again…it might just be an asteroid. Just sayin’…

—JL Galache
Minor Planet Center

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