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Managing worldwide observations of asteroids and comets, calculating their orbits and if they pose a threat to planet Earth! Terms: http://t.co/9YgOuzYNOy

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Asteroid 2015 GY12 flyby in ~ 30 mins (Apr 19 at 16:00 UT). Dist: 13.65 LD. Size: 14-45 m. http://t.co/UwN3eyRi9IAsteroid 2015 HD1 discovered. Flyby Apr 21 at 08:21 UT. Dist: 0.19 LD (0.17 LD from Earth surface). Size: 6-21 m. http://t.co/oimf6cZSbIAsteroid 2015 HC1 discovered. Flyby Apr 30 at 01:08 UT. Dist: 21.83 LD. Size: 7-23 m. http://t.co/UlcPpKuoYGAsteroid 2015 HZ discovered. Flyby May 6 at 09:32 UT. Dist: 32.73 LD. Size: 24-75 m. http://t.co/Ve75wMq1tL
Asteroid 2011 EX4 reobserved. Flyby Apr 30 at 01:22 UT. Dist: 28.62 LD. Size: 23-71 m. http://t.co/1xXCQR66JnAsteroid 2015 HK discovered. Flyby Apr 25 at 11:42 UT. Dist: 20.22 LD. Size: 15-47 m. http://t.co/RDBkcf9Enl
Asteroid 2015 GC14 discovered. Flyby May 16 at 08:49 UT. Dist: 29.86 LD. Size: 21-65 m. http://t.co/q5AGt4mJyf@MollyDenmark They haven't decided where yet. We're all speculating! Twitterbot's bet is on Japan, based on nothing but wild guessing.@Pillownaut @Poletro The rimshot echoed throughout the corners of the internet...She means "virtually", of course. MPC twitterbot doesn't exist in the physical world! @meganimpactAsteroid 2015 GB14 discovered. Flyby Apr 28 at 15:36 UT. Dist: 8.94 LD. Size: 17-54 m. http://t.co/XfZamUPJiM@MollyDenmark Not yet. Hopefully they'll announce during wrap-up comments.Thank you to fellow #PDC2015 tweeps: @asrivkin @michael_w_busch @schmemela @JessicaNoviello @meganimpact. You're worth much more than 140 cThe MPC twitterbot signs off from #PDC2015 as conference draws to a close. It was an intense week of asteroiding and learning!@faulkestel It's up at our end!MPC twitterbot starting to suffer from Conference Fatigue... #PDC2015.@Asteroid2008EV5 We imagine everyone. #AsteroidWars vs #StarWars
.@NEOProjectsSGAC poster at #PDC2015 for their name-an-asteroid outreach campaign, featuring MPC logo and support. http://t.co/WQHAZnJYb7Q: A “superbolide” is brighter than Moon; what do you call it when brighter than the Sun? Bill Cooke: Lindley Johnson’s problem. #PDC2015Bill Cooke gets MPC Award for Most Quotable Talk of the #PDC2015. Congratulations, Bill!Cooke on dealing with the media: Give them a couple of paragraphs and a video and you're off the hook! #PDC2015
Retweeted by Minor Planet CenterB. Cooke: Auto software can calculate fireball trajectory from all-sky cameras; if image saturated, software goes home to mama. #PDC2015B. Cooke: We have found the first tweet of an event comes out within seconds of fireball being seen. @Twitter is useful for us! #PDC2015B. Cooke: Once fireball event happens, you have 4 hours to respond with info before media lose interest and news cycle ends. #PDC2015B. Cooke: Stuff gets real when media reports about bolide/fireball or 50+ people see one...or @NASA HQ calls me. #PDC2015We forgive you @timmermansr :-) It’s a modest budget, and I think we give a good return on investment. @JLGalache.@NickAstronomer had :-p @SiTrance @MarkBosloughRumpf: Risk of impact/damage and population are correlated, but some small mid/sized nations have disproportionally high risk #PDC2015
Retweeted by Minor Planet Center.@MarkBoslough: “Here is my supercool *animation* of NASA’s boring, static, bolide map.” (We paraphrase) #PDC2015 http://t.co/uZKL4Q1ipzWhile we were at break, Lindley Johnson was briefing the media so they understand why NEOs are important #PDC2015 https://t.co/0bjb6WxKwH
Retweeted by Minor Planet Center.@MarkBoslough: Best way to save lives is to observe+discover Tunguska-size NEAs flying by within Moon orbit (~1/week). #PDC2015.@MarkBoslough: After revising bolide frequency model, Tunguska-size asteroids hit on average every 500 years. #PDC2015Drube: a 10 km/s impact with a 500 kg spacecraft could get a rotation period change of 6.5 minutes, easily measured from Earth #PDC2015
Retweeted by Minor Planet CenterWhy am I surprised to find asteroid at #PDC2015? Retrieval mission: @exploreplanets. Albedo estimate: 0.11 (S type?) http://t.co/60eaHeJ3BWReplays of Planetary Defence Conference so far https://t.co/CVldrSqU15
Retweeted by Minor Planet CenterBarbee: 50 NEAs more accessible than low lunar orbit, 580 more acc. than lunar surface, 1382 more acc. than Mars/Phobos/Deimos #PDC2015
Retweeted by Minor Planet CenterBarbee: No round-trip mission to Mars or Phobos/Deimos is possible with both delta-v < 12 km/s and duration < 450 days. #PDC2015
Retweeted by Minor Planet Center@esaoperations :) . .    . .:´` .  _ .·:´:´'  ( _ .´` .   . - ; ;- .   / ; ; ;´'. .\  |  ` ;  .:|   \ :;;;`;  /   ` - `.. - ´ #pdc2015
Retweeted by Minor Planet CenterOh look! It's just a delivery truck for the ISS XD @MinorPlanetCtr http://t.co/F4fSOQs5rc
Retweeted by Minor Planet CenterAsteroid 2015 GA1 flyby in ~ 30 mins (Apr 16 at 07:13 UT). Dist: 2.49 LD. Size: 9-28 m. http://t.co/VN7UIK3kmV
Asteroid 2015 GL13 discovered. Flyby Apr 16 at 07:55 UT. Dist: 0.49 LD (0.47 LD from Earth surface). Size: 3-9 m. http://t.co/8YazqTsaoTPer @elakdawalla's suggestion, the relative sizes of planets, moons, and trans-Neptunian Objects from Mars on down: http://t.co/AqgOG7mBbT
Retweeted by Minor Planet Center.@RichardNairn Not yet, but at some point we hope to receive some obs from them. @esaoperationsAnd #SMPAG docs & PPts at http://t.co/urtN5NobHj #PDC2015 https://t.co/CXVmemFj9v
Retweeted by Minor Planet Center@RonBaalke Blast from the past!Today is Tim Spahr's 45th Birthday (1970). Comet discoverer & former @MinorPlanetCtr Director. http://t.co/7hqYr7m5pA
Retweeted by Minor Planet Center.@asrivkin Most IAWN documents available on current IAWN page, hosted by MPC: http://t.co/Zivuhjmko2 #PDC2015S. Ulamec: Still looking for @Philae2014 in @ESA_Rosetta images. Know area but with wine, lots of 3x3 pixel clusters look like it. #PDC2015S. Schwartz mesmerizes us with movies of simulated impact ejecta flying off model asteroid. Important for orbiting craft safety. #PDC2015.@schmemela: Orb. period change depends on impact direction, but values are in 8-10 mins range. Still to see if shape matters. #PDC2015.@schmemela: We get 5-9m impact craters with CTSH models. Orb. period could change by ~10 mins. #PDC2015.@schmemela: Don’t know how Didymoon is put together (conglomerate, solid?) or composition, so we’re modeling all options. #PDC2015.@schmemela Talks about modeling expected outcomes of DART impact on Didymoon, asteroid Didymos’s moon, #PDC2015.@michael_w_busch Yep. Of course, it’s up to IAU to make an exception for the sake of whimsy. @JessicaNoviello @JHUAPLA. Cheng tl;dr: It’s a lot harder than you think to get DART to impact asteroid Didymos’s moon. #PDC2015 http://t.co/RmzclW0GR4.@JessicaNoviello Probably not: https://t.co/6QQwQPAbgv @JHUAPL #PDC2015R. Weaver shows the effects of various shape/weight impactors, incl. 2+ simultaneous impactors! There be differences. #PDC2015.@meganimpact: Physical properties and rotation of asteroid all influence the effectiveness of a kinetic impactor. #PDC2015.@meganimpact honours her handle by telling us about the Disruption Limits of Kinetic-Impactor Mitigation. #PDC2015Numerical models of asteroid surfaces being affected by nuclear weapons, or Jefferson Airplane LP covers? #PDC2015 http://t.co/TDcsZPi2H1
Retweeted by Minor Planet CenterFollow along at home! http://t.co/PNQu1Il1Gv #PDC2015Back on the wagon! 1st talk of Day 3: "Asteroid Defense: Comparison of Kinetic Impact and Nuclear Stand-off Schemes" by G. Gisler #PDC2015
Asteroid 2015 GY12 discovered. Flyby Apr 19 at 15:59 UT. Dist: 13.71 LD. Size: 16-49 m. http://t.co/IT2uhy7ZPQ@elmisunny @SpaceDyS Sorry for the misassignment of credit!@NickAstronomer We’re all betting on a large impactor being discovered far ahead of 1yr before impact time. #PDC2015.@NickAstronomer Actually, he said it could all be done with off-the-shelf equipment. Yes, including the nuke. #PDC2015P. Lubin shows movie of laser ablating an asteroid analogue. Very cool! MPC twitterbot changes allegiance from nukes to lasers. #PDC2015Phil Lubin promotes deflecting asteroids by vaporizing surface with lasers. He has scaled down considerably from his original idea.#PDC2015
Retweeted by Minor Planet CenterDearborn: I’ve only simulated billiards ball asteroids; for more realistic surfaces, I’m letting the young people work on that #PDC2015Dearborn energetically explains why you might need the nuclear option if the impactor isn’t going to work. #BlowUpAsteroids #PDC2015@IanMolony Meh! Railgun shmailgun :-)So...great fun to be had for anyone allowed to carry a nuke to an asteroid. #InsertBruceWillisReference #PDC2015(2/2) The neutrons and electrons from the explosion melt a section of the asteroid that blows off and imparts momentum to the rest #PDC2015K. Howley: A stand-off nuclear deflection works by exploding a nuke some hundreds of meters from an asteroid (1/2) #PDC2015Herbold: Shock wave not generated for 40-60% porosity; thermal expansion not enough to close pore space for investigated material. #PDC2015
Retweeted by Minor Planet CenterHerbold: Porous compaction may increase melt depth up to a precipitous drop. Stronger shocks observed in low porosity material. #PDC2015
Retweeted by Minor Planet Center@michael_w_busch Or they really hate it and that’s why they want to destroy it :-)If Bruce Willis doesn't convince you and you think you can do better, design your own deflection mission! http://t.co/BZEdFrZiZG #PDC2015Asteroid Impact *Exercise* continues today...and it's looking grim. Bruce Willis's name is begining to be whispered... #PDC2015Davide Perna: Can’t have asteroid deflection mission without reconnaissance first! #PDC2015Excellent orbit determination needed for space reconnaissance mission. #PDC2015Davide Perna: Need long obs baseline (years) to improve orbits of NEAs to highest accuracy. #PDC2015Davide Perna: Characterizing the NEA Population in the Framework of the @NEOShieldTeam Project. #PDC2015@NickAstronomer Yes it was!R. Weryk: Using fragmentation model we can estimate density. Do meteors in similar orbits have similar densities? Seems like YES. #PDC2015[2/2]@MinorPlanetCtr Planetary radar transmit has been done from Yevpatoria in Ukraine in the past; not particularly active lately. #PDC2015
Retweeted by Minor Planet Center[1/2] @MinorPlanetCtr As noted in Q&A, radar receive has been done in Japan, Russia, various EU states. Some interest from China. #PDC2015
Retweeted by Minor Planet CenterR. Weryk uses small radar to detect meteors larger than 300micro-m breaking up in the atmosphere, and it works both night AND day. #PDC2015R. Weryk talking about observation of meteors to constrain physical properties. #PDC2015Busch: new 80kW C-band transmitter on the 34m antenna at Goldstone. Used to image asteroid that passed Earth on Jan. 27, 2015. #PDC2015
Retweeted by Minor Planet Center.@michael_w_busch seems to have many dishes at his disposal to beam and receive radar signals from, but all in USA or Australia. #PDC2015.@michael_w_busch talks about observing Potentially Hazardous Asteroids with Radar. #PDC2015F. Bernardi shows some cool orbit viz software on NEODyS site: http://t.co/UJIq2vuMok #PDC2015B. Ryan shows slow-mo movie of exploding block of concrete (work by E. Ryan). ~20% of fragments are tumblers, rest are rotators. #PDC2015B. Ryan: Not all small asteroids are fast rotators, but people tend to chase only the fast ones. #PDC2015B. Ryan: Tough to characterise small 10-20m objects cos they stay bright enough for 2-3 days only. #PDC2015Webcast of today's presentations from Planetary Defense Conf #pdc2015 now live http://t.co/TEnl4eqEQY
Retweeted by Minor Planet CenterBill Ryan of the Magdalena Observatory talks about characterising small (<140m) NEAs. 77 observed, ~50 spin rates obtained. #PDC2015S. Chesley of @JPL invites us to read the gory details of Systematic Ranging in D. Farnocchia’s paper: http://t.co/YdoWjHEIuI #PDC2015S. Chesley of @JPL talks about estimating impact probabilities of @MinorPlanetCtr NEOCP objects #PDC2015 http://t.co/sEIxRBfoVk
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