NEO Distances

When a report is made of a close approach of an asteroid to the Earth, distances are often specified in Astronomical Units (AU) or possibly in Lunar Distances (LD). The table below relates these two units to the more familiar unit of the kilometre, and also to the Earth's radius (Re).

Note that 1 AU is just under 150 million km, and 1 LD = 0.00256 AU ~ 60 Re.

AU LD km Earth Radii
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0.0009
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0.04
0.08
0.12
0.16
0.19
0.23
0.27
0.31
0.35
0.39
0.78
1.17
1.56
1.95
2.34
2.72
3.11
3.50
3.89
7.78
11.68
15.57
19.46
23.35
27.24
31.13
35.03
38.92
77.83
116.75
155.67
194.59
233.50
272.42
311.34
350.26
14,960
29,920
44,879
59,839
74,799
89,759
104,719
119,678
134,638
149,598
299,196
448,794
598,392
747,989
897,587
1,047,185
1,196,783
1,346,381
1,495,979
2,991,957
4,487,936
5,983,915
7,479,894
8,975,872
10,471,851
11,967,829
13,463,809
14,959,787
29,919,574
44,879,364
59,839,148
74,798,936
89,758,728
104,718,512
119,678,296
134,638,080
2
5
7
9
12
14
16
19
21
23
47
70
94
117
141
164
188
211
234
469
703
938
1172
1407
1641
1876
2110
2345
4690
7034
9379
11724
14069
16414
18758
21103


ASAAustralian Space Academy