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The helios orbit evaluation experiment, and aspects for future missions (abstract)
Acta Astronautica Vol. 9, No. 2, p. 95, 1982 Printed in Great Britain.
0094-5765/821020095.-04503.00t0 Pergamon Press Ltd.
THE HELIOS ORBIT EVALUATION EXPERIMENT, AND ASPECTS FOR FUTURE MISSIONS (ABSTRACT).t W. KUNDT Institut far Astrophysik der Universit~it Bonn, F.R.G.
(Received 26 September 1978) Abstract--This experiment is now nearing its completion. A sensitive and rather flexible filter algorithm has been developed at Hamburg for the joint determination of a large number (~<30) of solve-for and consider parameters describing the changing forces on the spacecraft. Its action has been described in[12]. The major source of uncertainty in this and earlier spacecraft orbit evaluations is the changing surface absorptivity, which may be due to a partial phase transition in the cover glass. In view of this dimculty, dragfree missions are highly desirable; see Ref. 1. REFERENCES
1. W. Kundt, Astrophys. Space Sci. 30, 455-461 (1974). 2. W. Kundt, Contribution to "Gravitazione Sperimentale" (Pavia Symposium), publ. by Accademia Nazionale dei Lincei, Roma; p. 161, 1977.
tPaper presented at the 5th International Symposium on Space Relativity; XXIXth Congress of the International Astronautical Federation, Dubrovnik, Yugoslavia, 1-8 October 1978.
95
0094-5765/821020095.-04503.00t0 Pergamon Press Ltd.
THE HELIOS ORBIT EVALUATION EXPERIMENT, AND ASPECTS FOR FUTURE MISSIONS (ABSTRACT).t W. KUNDT Institut far Astrophysik der Universit~it Bonn, F.R.G.
(Received 26 September 1978) Abstract--This experiment is now nearing its completion. A sensitive and rather flexible filter algorithm has been developed at Hamburg for the joint determination of a large number (~<30) of solve-for and consider parameters describing the changing forces on the spacecraft. Its action has been described in[12]. The major source of uncertainty in this and earlier spacecraft orbit evaluations is the changing surface absorptivity, which may be due to a partial phase transition in the cover glass. In view of this dimculty, dragfree missions are highly desirable; see Ref. 1. REFERENCES
1. W. Kundt, Astrophys. Space Sci. 30, 455-461 (1974). 2. W. Kundt, Contribution to "Gravitazione Sperimentale" (Pavia Symposium), publ. by Accademia Nazionale dei Lincei, Roma; p. 161, 1977.
tPaper presented at the 5th International Symposium on Space Relativity; XXIXth Congress of the International Astronautical Federation, Dubrovnik, Yugoslavia, 1-8 October 1978.
95