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Text File  |  1991-03-09  |  1KB  |  31 lines
  1. NEPTUNE
  2. DISTANCE FROM THE SUN:
  3.                 MEAN                2,795,000,000 mi. (4,498,100,000 km.)
  4. SHORTEST                            2,771,000,000 mi. (4,459,500,000 km.)
  5. GREATEST                            2,819,000,000 mi. (4,536,700,000 km.)
  6. CLOSEST APPROACH TO EARTH           2,678,000,000 mi. (4,309,800,000 km.)
  7.  
  8. LENGTH OF YEAR (EARTH-DAYS)         60,188
  9. AVERAGE ORBITAL SPEED               3 mi. per sec.  (5 km. per sec.)
  10. DIAMETER AT EQUATOR                 30,760 mi.      (49,500 km.)
  11. ROATION PERIOD                      15 hrs. 40 min.
  12. TILT OF AXIS (DEGREE)               29
  13. AVERAGE TEMPERATURE                 Unknown; probably lower than -280°F.
  14.                                     (-173° C.)
  15. ATMOSPHERE:
  16. PRESSURE                            (?)
  17.                                     (?)
  18. GASES                               HYDROGEN, HELIUM, METHANE, AMMONIA
  19. MASS (EARTH=1)                      17.3
  20. DENSITY (WATER=1)                   2.2
  21. GRAVITY (EARTH=1)                   1.43
  22. NUMBER OF SATELLITES                2
  23.  
  24. NEPTUNE'S SATELLITES
  25.  
  26.                MEAN      SIDEREAL    VISUAL
  27.    NAME      DISTANCE     PERIOD    MAGNITUDE   RADIUS    DISCOVERY
  28.              10³ mi.  days hr min               (miles)
  29. TRITON            220    5 21 03R   13.6 Var.     1,150   Lassell    1846
  30. NEREID          3,460  359 10       18.7            100   Kuiper     1949
  31.