Is it a bird? Is it a plane? Is it an asteroid???

2015 HP116

(Image: ESA, image by C.Carreau)

Earlier today, the International Astronomical Union’s Minor Planet Centre (MPC) had a good news to share with the world: the Earth had a new moon! This morning, one of the MPC’s staff members posted a description of the so-called moon, also named 2015 HP116. The small asteroid was supposed to orbite our planet until March 2019.
Unfortunately, the news was disclaimed a few hours later, when scientists realised that our new moon was in fact the ESA’s (European Space Agency) Gaia space telescope. For unknown reasons, the telescope did not show up in the checks supposed to filter out sightings of artificial objects, which led to this confusion.

Click here to read the full article.

NEO NEWS (21 April 2015) NASA ARM, OSIRIS-Rex, and Planetary Defense Conference

Bolden Not Concerned About ARM Criticism

Space News, April 15 2015, by Jeff Foust
[http://spacenews.com/31-space-symposium/#sthash.ivLIzIyJ.dpuf]

NASA Administrator Charles Bolden said April 14 he is not concerned with recent criticism of the Asteroid Redirect Mission (ARM) by the agency’s own advisory group.
The NASA Advisory Council, at an April 10 meeting in Washington, unanimously approved a finding that concluded that NASA should not carry out its current plans for ARM. Those plans involve landing a spacecraft on a near Earth asteroid, grabbing a boulder several meters across, and returning that boulder to orbit around the Moon in order to be visited by astronauts on an Orion spacecraft.
The council instead suggested that NASA develop one of the key ARM technologies, solar electric propulsion, and use it to power a spacecraft on a round-trip flight to Mars. Other reasons for flying ARM, including asteroid science and planetary defense, “do not have value commensurate with their probable cost.”
Bolden, in a brief interview after a panel session of space agency leaders here, said he had not received the formal text of the council’s finding, but did not anticipate NASA making a formal response to it. “It’s just a finding, so there’s no need for a response,” he said, as opposed to a recommendation that would require one.
Asked if he was concerned about this latest criticism of ARM, two years after NASA first announced plans to carry out the mission, Bolden offered a succinct response: “Not really.”

 


 

OSIRIS-REx Mission Progress

NASA Press Release, March 31

[http://www.nasa.gov/press/2015/march/nasa-s-osiris-rex-mission-passes-critical-milestone/]

NASA’s groundbreaking science mission to retrieve a sample from an ancient space rock has moved closer to fruition. The Origins Spectral Interpretation Resource Identification Security Regolith Explorer (OSIRIS-REx) mission has passed a critical milestone in its path towards launch and is officially authorized to transition into its next phase….
“This is an exciting time for the OSIRIS-REx team,” said Dante Lauretta, principal investigator for OSIRIS-Rex at the University of Arizona, Tucson. “After almost four years of intense design efforts, we are now proceeding with the start of flight system assembly. I am grateful for the hard work and team effort required to get us to this point.”
OSIRIS-REx is the first U.S. mission to return samples from an asteroid to Earth. The spacecraft will travel to a near-Earth asteroid called Bennu and bring at least a 60-gram (2.1-ounce) sample back to Earth for study. OSIRIS-REx carries five instruments that will remotely evaluate the surface of Bennu…..OSIRIS-REx is scheduled for launch in late 2016. The spacecraft will reach Bennu in 2018 and return a sample to Earth in 2023.


 

Planetary Defense Conference April 13-17 in Frascati, Italy

Attendance was 245, including 16 from the media. There were 81 oral papers, and approximately the same number of poster papers.

Planetary Society blog: [http://www.planetary.org/blogs/bruce-betts/2015/20150413-planetary-defense-conference.html]

Media Briefing and access to additional information: [http://blogs.esa.int/rocketscience/2015/04/16/planetary-defense-conference-2015-media-briefing/]

 


 

Asteroid Threat Exercise at PDC Meeting

by David Morrison

Over the 5 days of the Planetary Defense Conference in Frascati, the attendees participated in an imaginary impact scenario. The fictional asteroid 2015PDC followed an orbit carefully planned by Paul Chodas (JPL); Mark Boslough (Sandia) modeled the probable effects of impacts over land and sea, and Debbie Lewis (Axiom) stage-managed the exercise. The scientists attending the meeting provided regular strategy inputs to the “world leaders” on how to deal with the possibility of an impact on September 3, 2022. Many volunteered for role-playing to represent the reactions of political leaders and the public.

The exercise began on Day 1 of the conference with the announcement, dated June 9, 2015, of discovery of 2015PDC (a fictitious asteroid with diameter between 150 and 450m) and its predicted close pass by Earth seven years in the future. On Day 2 it was announced that new observations had improved knowledge of the orbit and now predicted a 50% chance of impact, and by December 2016 (18 months after discovery) an impact was certain. Although the exact location could not be determined, the locus of possible impact points was defined by a “risk corridor” that stretched from the Pacific Ocean, across the South China Sea, and into the South Asian mainland. Cities lying close to this path included Manila, Hanoi, Dhaka, Delhi, and Tehran. Here the role-playing began, with the realization that the areas at risk were all in Asia, and that a majority of the world’s Moslems were living along the risk corridor, while most of the decision-making would likely be done in Europe and the United States. The only two nations along risk corridor with substantial space capabilities were China and India.

 

By summer 2019 the risk corridor had shrunk to within the South China Sea. While there could be potential tsunami damage to the nations around this body of water, large population centers such as Dhaka and Delhi were spared. In spite of the reduced risk, the US, ESA, and Russia proposed to launch several kinetic impactor (KI) missions in the only available window in August 2019. This information precipitated the major crises of the exercise, since any KI effort that was not fully successful in moving the target area off the Earth could move it into the heavily populated parts of India and Bangladesh. Thus some nations wanted to take the hit and deal with the resulting tsunami, while others opted for the KI attempts. We faced the new threat of possible warfare between China and India.

The adopted scenario did include the launch of several KI missions, but the deflection was only partially successful. The asteroid split, with one part missing the Earth, while a 100m fragment was still headed for the Ganges and Brahmaputra deltas, including the cities of Delhi and Dhaka. Having tried to deflect the asteroid, we were now dealing with a human-made threat rather than an “act of god”, with associated issues of liability and compensation. India unilaterally decided to attempt a last-minute nuclear strike on the asteroid, but this mission failed. The exercise concluded with asteroid impact near Dhaka on September 3, 2022.

Was this a realistic simulation of an impact threat? The answer is yes, for the orbit of the asteroid and the limited windows for telescopic and radar observations. But the political leaders were being played by scientists with no prior expertise on the nations involved, so their assessments and decisions were strictly amateur. In any case, it was educational for the participants. We got a much better idea of how difficult it would be to measure size and physical properties, and how few opportunities there would be for spacecraft or radar observations, in the case where the asteroid picked us, not the other way around. And it illustrated that while we talk about defending the planet, in a real case individual nations will likely have conflicting priorities on how to deal with the threat.

 



 

NEO News (now in its twentieth year of distribution) is an informal compilation of news and opinion dealing with Near Earth Objects (NEOs) and their impacts. These opinions are the responsibility of the individual authors and do not represent the positions of NASA, Ames Research Center, the International Astronomical Union, NEOShield, or any other organization. If anyone wishes to copy or redistribute original material from these notes, fully or in part, please include this disclaimer.

 

PDC2015: Impact scenario

Note: This article concerns a hypothetical asteroid scenario. The information described in this article does not concern a real world event but is based on the practise scenario used at the PDC2015.


 

The planetary defense conference 2015 has gone through its last day this Friday, and this day was fully dedicated to the conclusion of the PDC2015 impact scenario. During the conference all the experts on planetary defence enacted a scenario in which an asteroid is on collision course with Earth. Using such a scenario the people can learn how political leaders, citizens, and the media would respond in the case of such a threat. 

 

Day 1: An asteroid threat detected

An map of day 1 of the PDC2015 impact scenario with the impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

A map of day 1 of the PDC2015 impact scenario with the impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

On the first day of the conference the organizing committee presented the following scenario: A Near-Earth Asteroid is predicted to pass very close to the Earth on the 3rd of September 2022. The asteroid (designated 2015 PDC) has a chance of 1 in 110 of hitting the Earth. If the Earth would be hit by the asteroid it would strike somewhere on the corridor shown in the picture: The Middle-East, across South-Asia and the Pacific would all be of risk for the impact.

To discuss this scenario the experts were split in four groups. The first group represents the world leaders of countries that are in the path of the asteroid and are thus directly under risk of an impact. The second group represents all other leaders whose countries are not under direct threat from an impact. The third group are people who are living in the countries at risks and whose homes are under risk of being hit. Finally, the fourth group represents the media and needs to estimate how the media would react on this scenario.

See the day 1 scenario information here: http://neo.jpl.nasa.gov/pdc15/day1.html

 

Day 2: April 2016, 43% chance of impact

An image of day 2 of the PDC2015 impact scenario with the asteroid possible tracjectories. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

An image of day 2 of the PDC2015 impact scenario with the asteroid possible tracjectories. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

On the second day of the conference the organisation committee presented the participants with an updated scenario. The first day the scenario took place in June 2015, and the impact chance was smaller than a per cent. Now on day 2 the scenario made a jump in time to April 2016. The asteroid had passed through one orbit around the sun and now it could again be observed more closely again, allowing its orbit to be determined better. It however did not bring good news: The new orbit showed that the asteroid now has a 43% chance of hitting Earth! The image given shows the possible location of the asteroid (the red dots) at the possible time of impact.

The reaction of the experts was still one of doubt. As there was still a larger chance that the asteroid would miss the Earth compared to it actually hitting, all parties did not decide to start a deflection mission yet, but all parties did ask for extra information. Everyone wanted to know more about the asteroid and its orbit. More information was however not available as there were no telescopes or spacecraft available to observe the asteroid more closely.

For all the details of day 2, take a look at this site: http://neo.jpl.nasa.gov/pdc15/day2.html

 

Days 3 and 4: Certain impact, and kinetic impactors on their way

A map of day 4 of the PDC2015 impact scenario with the reduced impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

A map of day 4 of the PDC2015 impact scenario with the reduced impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

On day 3 and 4 the impact scenario became more definitive when the scenario jumped from December 2016 (day 3) to August 2019 (day 4). The reason for these large time-steps between the subsequent days is that due to the orbit of the asteroid around the Sun, it is not visible all the time. It is often hidden behind the sun from the point of view of the Earth, making it difficult to observe its size and orbit.

On day 3 it was announced that the impact of the asteroid was now a 100% certain. On day 4 the exact impact zone was then released: An impact was expected within the South-China sea. The impact of an asteroid between 150 and 250 meters (as expected in the scenario) would trigger a large tsunami that would impact all the coasts along this sea, hitting China, Vietnam, the Philippines, Malaysia, Brunei, Taiwan, and Indonesia. In total it would put more than 80 million people at risk. To mitigate the threat there are in total six kinetic impactors underway to push the asteroid out of its course so that it will miss Earth.

A orbit diagram for the PDC2015 impact scenario. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

A orbit diagram for the PDC2015 impact scenario. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

Within the discussion among the experts it quickly became clear that there was quite a bit of mistrust among the different country leaders concerning the kinetic impactor missions, and also specifically concerning a possible nuclear blast deflection option! The country leaders and the inhabitants of the countries around the South-China-Sea were worried if the kinetic impactors would actually be effective, and if it would be enough to deflect the asteroid. Also countries were suspicious of each other if any of them were developing nuclear deflection options, as they argued that although such a method could be effective against asteroids, it could also be used as a weapon.

For the detailed information provided on day 3, see here: http://neo.jpl.nasa.gov/pdc15/day3.html

And for the details of day 4, take a look at http://neo.jpl.nasa.gov/pdc15/day4.html 

 

Day 5: Kinetic impactors not fully effective!

On day 5, the last day of the conference, the speed of the scenario was ramped up, and a total of three “press-releases” were presented to the participants during the day. The first one was already ominous enough: The date is January the 18th, 2021 (1.5 years before impact) and the kinetic impactors only have had partially effect. The asteroid turned out to be a lose rubble pile, and after the second kinetic impactor hit, the object was broken in two big pieces!

A map of day 5 of the PDC2015 impact scenario with a renewed, widened impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

A map of day 5 of the PDC2015 impact scenario with a renewed, widened impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

The bigger piece was fortunately pushed away by the impactors and no longer poses a threat to the Earth. The smaller piece however, which is still 60 to 100 metres large, is still on impact course with the Earth. Because of the impactors the orbit of the object is again uncertain, and therefore the impact corridor has widened again (see image above).

The last map of day 5 of the PDC2015 impact scenario with the final impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

The last map of day 5 of the PDC2015 impact scenario with the final impact risk corridor. (Image credit: IAA; JPL. Note: Hypothetical impact scenario, no real world event.)

Later in the day the scenario progressed further and it ended on August the 27th, 2022, about a month before impact. The impact location had by now been determined to be at one of the worst possible locations: in the middle of Dhaka, the capital city of Bangladesh. Dhaka is the tenth biggest city in the world, with an estimated population of over 20 million in the 2020s. An asteroid of this size in the middle of the city would be disastrous.

The experts suggested that if a nuclear deflection options would still be possible, it should certainly be deployed to try and disintegrate the asteroid before it hit Earth. Furthermore the largest part of the city of Dhaka would need to be evacuated for the expected impact date.

The scenario ended at this point, but it left more then sufficient considerations and food for thought to be considered. Day 5 had a number of different information updates over the day, you can find these at:

http://neo.jpl.nasa.gov/pdc15/day5-1.html

http://neo.jpl.nasa.gov/pdc15/day5-2.html

and http://neo.jpl.nasa.gov/pdc15/day5-3.html

 

Lessons learned

Overall the scenario was very useful for the scientists and engineers, mostly because it teaches them what kind of social and civil aspects of a possible meteor strike are of importance: The impact of a NEO would certainly not be of scientific/engineering alone, it would be far more important politically and socially. Through the practice of these scenarios the experts also learn to think from the positions of political leaders, the media, and the public.

A final discussion on the impact scenario at the planetary defense conference 2015.

A final discussion on the impact scenario at the planetary defense conference 2015.

Interesting to note was specifically the discussion that arose over whether or not a nuclear deflection option should be developed and deployed. The development of such a device would certainly bring large political consequences with it.

Furthermore there is a large ethical aspect to consider as well: In the scenario the impact would first take place in the South-China-sea. Such an impact in the sea would trigger a large tsunami that would hit the coasts. It is however very difficult to predict how big such a tsunami would be, and how it much damage it would do. To stop the asteroid from hitting the Earth a number of nations developed kinetic impactors that were designed to deflect the asteroid. However they were unfortunately only partially successful, and this meant that a large city was now put at risk instead. Due to the kinetic impactors the people at the South-China-sea were now save, but the people at Dhaka will lose their homes! Are the states who build and launched the kinetic impactors now responsible for this? This is a major ethical question that needs to be looked at and practice scenarios such as this help to develop a proper policy of how to respond in these kinds of situations.

Asteroid 2004 BL86 visible in your telescope

 

Sky map showing the track of asteroid 2004 BL86 across the evening sky. Image credit: universetoday.com, made with Chris Marriott’s SkyMap program.

In our previous article we already introduced you to a big asteroid that is coming into our neighborhood soon: Asteroid 2004 BL86 will pass by at approximately 3.1 lunar distances (or 1.2 million kilometers). Thanks to its size (somewhere around 680m in diameter) the asteroid will even be visible through small telescopes and maybe even through large binoculars.

The asteroid will pass closest to Earth on the evening of Monday the 26th of January. When it does it will be the largest asteroid to approach the direct neighborhood of Earth for quite a long time. The next one is projected to be asteroid 1999 AN10, that will visit in 2027.

Trajectory of 2004 BL86 when it passes by the Earth. Image credit: NASA/JPL-Caltech.

Due to the large size of the asteroid it is expected to reach a magnitude of +9.0 and will be best visible for observers in the Americas, Europe and Africa. It will move across the evening sky at a noticable rate, so if you follow it with a telescope you should be able to see it move through your field of view. It will move at approximately 2 degrees per hour(four Moon diameters).

To track the asteroid you will need a sky map such as this image to find it in the sky. Note that the position of the asteroid might vary slightly depending on where you are on the Earth. You can also use software such as Starry Night, Guide, MegaStar and others to generate such a map and find the current position of asteroid. For this you can find the latest orbital data of the object here.

Next to all the amateur astronomers that will surely be trying to find the asteroid in their telescopes, NASA is also going to have a look using the big radar observatories at Arecibo in Puerto Rico and Goldstone, California. They will try to bounce microwaves of the surface of the asteroid to get a clearer picture of how it actually looks.