منابع مشابه
A Search for N2 in Spectra of Comet C/2002c1 (ikeya-zhang)
We report lowand high-resolution spectra of comet C/2002C1 (Ikeya-Zhang) from McDonald Observatory. The comet had a well-developed ion tail including CO, CO2 , CH , and H2O . We used our high-resolution spectra to search for N2 . None was detected and we placed upper limits on N + 2 /CO + of 5.4× 10. N2 was detected in the low-resolution spectra but we show that this emission was probably tellu...
متن کاملEnvisat Precise Orbit Determination
The Navigation Office at ESOC has been closely involved in all aspects of the Precise Orbit Determination (POD) of Envisat throughout the mission lifetime. These activities started shortly after launch through membership of the Orbit Validation Team (OVT). During this time ESOC was involved in both calibration and validation of the DORIS doppler data, the SLR data and the different POD solution...
متن کاملOptimal Orbit Determination∗
Existing definitions for optimal orbit determination are not satisfactory. Any useful definition must explicitly address questions relating to sequential processing, linearization, performance function and its extremalization, state estimate structure completeness, use of physics in applicable stochastic processes, and criteria for validation. Such a definition is presented.
متن کاملVoyager Orbit Determination at Jupiter
-This paper summarizes the Voyager 1 and Voyager 2 orbit determination activity extending from encounter minus 60 days to the Jupiter encounter, and includes quantitative results and conclusions derived from mission experience. The major topics covered include an identification and quantification of the major orbit determination error sources and a review of salient orbit determination results ...
متن کاملMulti-Observations Initial Orbit Determination based on Angle-Only Measurements
A new approach with the ability to use the multiple observations based on the least square approach has been proposed for initial orbit determination. This approach considers the Earth’s Oblateness by using the developed Lagrange coefficients. The efficiency of the proposed method has been tested in two scenarios. The first scenario is to use the simulated and the second one is to utilize the r...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1966
ISSN: 0004-6256
DOI: 10.1086/110078