Peter Vereš, Juraj Tóth, Leonard Kornoš Search for very close Search for very close approaching NEAs approaching NEAs Comenius University, Bratislava, Slovakia Faculty of mathematics, physics and informatics Department of astronomy, physics of the Earth and meteorology
16
Embed
Peter Vereš, Juraj Tóth, Leonard Kornoš Search for very close approaching NEAs Comenius University, Bratislava, Slovakia Faculty of mathematics, physics.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Peter Vereš, Juraj Tóth, Leonard Kornoš
Search for very close approaching Search for very close approaching NEAsNEAs
Comenius University, Bratislava, Slovakia
Faculty of mathematics, physics and informatics
Department of astronomy, physics of the Earth and meteorology
Objectives
• Create NEA model population
• Simulation of geometrical conditions during close Earth encounters
• Detection probability of synthetic population
Known NEA population
NEA NEC PHO IEO
05/01/2006 3769 77 774 5
Size depending on
avg. A
Known population
Bottke model
2001
Rabinowitz model
1994
Stuart model
2004
D>1000m 95% 73% 71%
D>100m 8,7% 3,2% 3,2%
D>10m
253137302614383747
55.10 % 510 % 43.10 %
5020750
• Known NEO counts versus models
Known NEA population• Orbital elements & size distribution of NEA
• Smaller NEAs – lesser count
• Closest approaches to the Earth within Moon orbit distance & their size distribution
Survey programs
1 25log( ) 2.5log 1V r H G G
0.63
1 exp 3.33tan2
1.22
2 exp 1.87 tan2
120
0,15;0,40G
10 105log 2,5logH C D A
Apparent magnitude
Absolute magnitude – Albedo - Size
Our work: 18m – 1kmalbedo vs. diameter 23m – 100m
28m – 10m
Limiting conditions:
WFS• Idea to search in the close Earth vicinity, wide field vs. low limit. mag.