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The Sodium Atom Coma of Comet Bennett (1970II)

Hu Zhong-wei, Che Hao   

  1. Astronomy Department, Nanjing University
  • Received:1984-08-15 Revised:1900-01-01 Online:1986-04-24 Published:1986-04-24

Abstract: In this paper, the sodium atom coma of comet Bennett (1970II) is analysed. Using the Na-Dmonochromatic isophotes given by Rahe, average scale-lengths of sodium atom and its parent molecule are found by Haser's theoretic model. Converting to heliocentric distance 1 AU, they are 4.49×105 km and 1.47×104 km respectively. Taking typical outflow velocity, mean lifetimes of sodium atom and its parent molecule are estimated as 1.5×105 seconds and 2.45×104 seconds respectively. With the use of theoretic formula of Dolginov as well as other related formula and data, it is calculated that the thermal velocity and temperature of sodium atom are respectively as 2.04-5.69 km/s and 5.76×103-4.48×104 K, and hydrodynamical (outflow) velocity of sodium atom is 2.66X10 km/s when converting to heliocentric distance 1AU. Finaly, brief discussions on relevant problems are also made.

Key words: Microgravity, Contact angle, Liquid filling level, Shooting method