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29999
Re: Estimates of the the Impact hazard ... We have orbits for basically all of the NEO with radii > or ~ 1 km (the real hazards to our civilizations), and none will hit anytime soon. (Any we do not
Marshall Eubanks
11:28 AM
#29999
 
29998
Estimates of the the Impact hazard Hello everyone - Marshall Eubanks wrote: "My personal feeling is that we have reached the point of diminishing returns RE the asteroid threat in the next 100
E.P. Grondine
10:30 AM
#29998
 
29997
Re: A "surprising number of asteroid impacts on Earth during the las As I mentioned to Dan Fischer yesterday, the effect of clustering has been well studied and is contained in the 2003 NASA report
Alan Harris
8:56 AM
#29997
 
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29996
Re: A "surprising number of asteroid impacts on Earth during the las ... I think the risk is slightly larger as cities are not randomly spread on the Earth surface but highly clumped. So the "average" density is a bit
Marco Langbroek
2:48 AM
#29996
 
29995
Re: A "surprising number of asteroid impacts on Earth during the las Dan, I concur fairly closely with your numbers, although my "best guess" of the population is the red open square symbols on slide 27, not the straight blue
Alan Harris
Apr 22
#29995
 
29994
Re: A "surprising number of asteroid impacts on Earth during the las ... My personal feeling is that we have reached the point of diminishing returns RE the asteroid threat in the next 100 years of so, but that the threat from
Marshall Eubanks
Apr 22
#29994
 
29993
Re: A "surprising number of asteroid impacts on Earth during the las Your calculation makes perfect sense (to me at least J ). Going after the 20 meters objects is ridiculous, and using Chelyabinsk as a way to say we need
Alain Maury
Apr 22
#29993
 
29992
Re: A "surprising number of asteroid impacts on Earth during the las ... And guess what: the narration of B612's own video http://vimeo.com/92352492 *also* talks about one 'city killer' globally per 100 years (something their
skyweek
Apr 22
#29992
 
29991
Re: A "surprising number of asteroid impacts on Earth during the las Having spent some time over the Easter weekend reading recent astronomical literature re. the current impact rates on Earth and watching Alan Harris' March 28
skyweek
Apr 22
#29991
 
29990
Re: List questions Augh! Sloppy me! Of course the first section refers to observations and not discoveries. If the list were discoveries there would be something like a
Wiggins Patrick
Apr 22
#29990
 
29989
Re: List questions ... That should be the total numbers of observations (not discoveries). according to MPC "Running Tallies", All Time MP discoveries right now is 639091. The
walcom77
Apr 22
#29989
 
29988
List questions It's cloudy here at 718 tonight so I spending time going over the MPC site and find myself with a few questions maybe folks here can answer: Looking at:
Wiggins Patrick
Apr 22
#29988
 
29987
Power laws and data Hi - "Extrapolating the bolide data beyond the range of observations is a bit of a fool's errand." Another set of data for this class of impactors comes from
E.P. Grondine
Apr 21
#29987
 
29986
Re: Asteroid Crantor  Dr. Meeus, Looking at the ephemeris it was starting to pass in front of the Milky Way in 2009 and 2010, and it is not easy task doing  doing astrometry in
astrogram3
Apr 21
#29986
 
29985
Asteroid Crantor The exceptional asteroid (83982) Crantor is a "horseshoe companion" to Uranus. Its orbital evolution has been investigated by C. and R. de la Fuente Marcos
Jean Meeus
Apr 21
#29985
 
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29984
Asteroid (83982) Crantor The exceptional asteroid (83982) Crantor is a "horseshoe companion" to Uranus. Its orbital evolution has been investigated by C. and R. de la Fuente Marcos
Jean Meeus
Apr 21
#29984
 
29983
Further comments on "Power Laws" Hi - There are some other points that need to be noted concerning "power laws". To my knowledge, the first "power law" was estimated by Morrison based on data
E.P. Grondine
Apr 20
#29983
 
29982
Re: How are you? Yes. The quick solution is to block posts from this address. However, the owner of the address should be notified, as it might be a virus on that person's
Alan Harris
Apr 20
#29982
 
29981
Re: How are you? Is this not the second message from this same individual with a toxic link? ... Dr. Clay Arkansas Sky Observatories http://www.arksky.org/ ASO Petit Jean
P. Clay Sherrod
Apr 20
#29981
 
29980
Two 'maybe' radar targets on NEOCP Hello all, There are two possible radar target objects now on NEOCP. Details at http://www.projectpluto.com/neocp/neocp.htm I'd normally not mention this
Bill Gray
Apr 20
#29980
 
29978
Re: WARNING: message from theks@aol.com contains virus All, I have deleted that message. As always, be -very- careful about opening any link unless you have good reason to trust it. Clear Skies, Brian D. Warner
Brian Warner
Apr 19
#29978
 
29977
WARNING: message from theks@aol.com contains virus Don't open the link!!! Werner Schroer Australia
Werner Schroer
Apr 19
#29977
 
29975
Re: NASA Completes LADEE Mission with Planned Impact on Moon's Surfa ... It was found back in the 1960's (with Lunar Orbiter) that the Moon's low level gravity field is very lumpy, due to the Lunar Mascons underneath the Mare,
Marshall Eubanks
Apr 19
#29975
 
29974
NASA Completes LADEE Mission with Planned Impact on Moon's Surface ... science operations and was intentionally sent into the lunar surface. The spacecraft's orbit naturally decayed following the mission's final low-altitude
happy_rasta
Apr 19
#29974
 
29973
Murmansk Bolide Another webcam discovery http://rt.com/news/meteorite-murmansk-explosion-space-588/
Marshall Eubanks
Apr 19
#29973
 
29972
NASA Innovative Advanced Concept Program Seeks Phase II Proposals April 18, 2014 NASA Innovative Advanced Concept Program Seeks Phase II Proposals NASA's Innovative Advanced Concepts (NIAC) Program is seeking proposals for
Ron Baalke
Apr 18
#29972
 
29971
Small object impact rates; data processing requirements ... Hi Dan - The data comes from various international reconnaissance systems, and is "rock hard". Due to the sources of that data, it is very carefully
E.P. Grondine
Apr 18
#29971
 
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29970
NASA Completes LADEE Mission with Planned Impact on Moon's Surface April 18, 2014 NASA Completes LADEE Mission with Planned Impact on Moon's Surface Ground controllers at NASA's Ames Research Center in Moffett Field, Calif.,
Ron Baalke
Apr 18
#29970
 
29969
Re: MPES "Further Information" Note I must confess to being the "outside user" who pointed out that several objects were classified as "NEO : Desirable between 2014 Apr. 16-May 16." On the
Tony Evans
Apr 17
#29969
 
29968
MPES "Further Information" Note Just an FYI for those planning to use the Minor Planet Center's Ephemeris Service: The MPC has temporarily suspended the use of the "Further Information"
Gerald McKeegan
Apr 17
#29968
 
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