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Text File  |  1991-05-09  |  1KB  |  29 lines
  1. Comets:
  2.  
  3. Predicted Perihelion Passages of Comets, 1991:
  4.  
  5.                                                Revolution  Perihelion
  6.                                  Perihelion      period     distance
  7.    Periodic comet                  date           years        au*
  8.  
  9. Russell 1                         Jan.   3         7.6        2.17
  10. Swift-Gehrels                     Feb.  22         9.2        1.36
  11. Wolf-Harrington                   Apr.   4         6.5        1.61
  12. Haneda-Campos                     Apr.  11         6.3        1.22
  13. Van Biesbroeck                    Apr.  24        12.4        2.40
  14. Hartley                           May   18         6.0        1.82
  15. Arend                             May   26         8.0        1.85
  16. Harrington-Abell                  July   6         7.6        1.77
  17. Kowal-Mrkos                       July  18         9.3        2.68
  18. Takamizawa                        Aug.  18         7.2        1.59
  19. Tsuchinshan                       Aug.  30         6.6        1.50
  20. Wirtanen                          Sept. 20         5.5        1.08
  21. Arend-Rigaux                      Oct.   2         6.8        1.44
  22. Faye                              Nov.  16         7.3        1.59
  23. Kowal 2                           Dec.  28         6.5        1.50
  24.  
  25. * [1 au = approximately 93 million miles, or the distance between the
  26.   Earth and the sun.]
  27.  
  28. Source:The Nautical Almanac Office, U. S. Naval Observatory.
  29.