Closest Approaches to the Earth by Comets
    Distance
    (AU)    		 Date (TT) Permanent designation 
    0.0151
    		 
    1770
    		 
    July
    		 
    1.7
    		 
    D/1770 L1 (Lexell)
    		 
    0.0229
    		 
    1366
    		 
    Oct.
    		 
    26.4
    		 
    55P/1366 U1 (Tempel-Tuttle)
    		 
    0.0312
    		 
    1983
    		 
    May
    		 
    11.5
    		 
    C/1983 H1 (IRAS-Araki-Alcock)
    		 
    0.0334
    		 
    837
    		 
    Apr.
    		 
    10.5
    		 
    1P/837 F1 (Halley)
    		 
    0.0366
    		 
    1805
    		 
    Dec.
    		 
    9.9
    		 
    3D/1805 V1 (Biela)
    		 
    0.0390
    		 
    1743
    		 
    Feb.
    		 
    8.9
    		 
    C/1743 C1
    		 
    0.0394
    		 
    1927
    		 
    June
    		 
    26.8
    		 
    7P/Pons-Winnecke
    		 
    0.0437
    		 
    1702
    		 
    Apr.
    		 
    20.2
    		 
    C/1702 H1
    		 
    0.0617
    		 
    1930
    		 
    May
    		 
    31.7
    		 
    73P/1930 J1 (Schwassmann-Wachmann)
    		 
    0.0628
    		 
    1983
    		 
    June
    		 
    12.8
    		 
    C/1983 J1 (Sugano-Saigusa-Fujikawa)
    		 
    0.0682
    		 
    1760
    		 
    Jan.
    		 
    8.2
    		 
    C/1760 A1 (Great comet)
    		 
    0.0787
    		 
    2006
    		 
    May
    		 
    12.4
    		 
    73P/Schwassmann-Wachmann
    		 
    0.0839
    		 
    1853
    		 
    Apr.
    		 
    29.1
    		 
    C/1853 G1 (Schweizer)
    		 
    0.0879
    		 
    1797
    		 
    Aug.
    		 
    16.5
    		 
    C/1797 P1 (Bouvard-Herschel)
    		 
    0.0884
    		 
    374
    		 
    Apr.
    		 
    1.9
    		 
    1P/374 E1 (Halley)
    		 
    0.0898
    		 
    607
    		 
    Apr.
    		 
    19.2
    		 
    1P/607 H1 (Halley)
    		 
    0.0934
    		 
    1763
    		 
    Sept
    		 
    .23.7
    		 
    C/1763 S1 (Messier)
    		 
    0.0964
    		 
    1864
    		 
    Aug.
    		 
    8.4
    		 
    C/1864 N1 (Tempel)
    		 
    0.0982
    		 
    1862
    		 
    July
    		 
    4.6
    		 
    C/1862 N1 (Schmidt)
    		 
    0.1018
    		 
    1996
    		 
    Mar.
    		 
    25.3
    		 
    C/1996 B2 (Hyakutake)
    		 
    0.1019
    		 
    1961
    		 
    Nov.
    		 
    15.2
    		 
    C/1961 T1 (Seki)
    		 
    Note: This list is complete for comets discovered after 1700 that approached
the earth to within 0.1020 AU.
It also includes a number of well-documented earlier approaches by  periodic
comets.
C/1491 B1 allegedly came to within 0.0094 AU on 1491  Feb. 20.0 TT,  but the
orbit of this comet is very uncertain. 
    Source: IAU Minor Planet Center
1 AU ~ 1,49597870 x 1011 meters


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