Murray appointed director of Jet Propulsion Laboratory

AbstractAmateur observations made since 1977 show that although the ephemerides for the satellites of Jupiter published by the Jet Propulsion Laboratory are more accurate than those in the Astronomical Almanac, there are still small deviations, which may increase with time. Observation of eclipses, transits and occultations, as well as of the mutual phenomena that occur at 6-yearly intervals can provide information for correction of the ephemerides. There appear to be three groups coordinating observations: 1) in Germany, started by P. Ahnert in the early 1960s and now under H.-J. Blasberg; 2) in the U.S.A., started by J. Ashbrook in 1976, and continued by J. Westfall of the ALPO; 3) in Australia and New Zealand, led by B. Loader. These groups appear to work independently, and it would greatly help research on this subject if there were an International Centre for collecting observations of the Jovian satellites – perhaps under the supervision of the IAU – whereby all observations made anywhere in the world would be available to anyone investigating the subject. Paris, where the predictions are calculated, might be a very suitable site for such a centre.

Download Full-text

Jet Propulsion Laboratory is considering its options

Nature ◽

10.1038/331295a0 ◽

1988 ◽

Vol 331 (6154) ◽

pp. 295-295

Author(s):

Joseph Palca

Keyword(s):

Jet Propulsion ◽

Jet Propulsion Laboratory

Download Full-text

Getting started on metrics-Jet Propulsion Laboratory productivity and quality

[1990] Proceedings. 12th International Conference on Software Engineering ◽

10.1109/icse.1990.63616 ◽

2002 ◽

Cited By ~ 4

Author(s):

M.W. Bush

Keyword(s):

Jet Propulsion ◽

Jet Propulsion Laboratory ◽

Laboratory Productivity

Download Full-text

Development of Microwave Limb Sounder

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.500.204 ◽

2012 ◽

Vol 500 ◽

pp. 204-211

Author(s):

Yue Feng Zhao ◽

Jing Li

Keyword(s):

Stratospheric Ozone ◽

Vertical Resolution ◽

Jet Propulsion ◽

Upper Troposphere ◽

The Past ◽

High Vertical Resolution ◽

Temperature And Pressure ◽

Jet Propulsion Laboratory ◽

Lower Noise ◽

Higher Sensitivity

Microwave limb sounding is powerful to measure atmospheric compositions, temperature and pressure with high vertical resolution. During the past few decades many countries have developed several Microwave limb sounders to improve our understanding of stratospheric ozone chemistry and dynamics, the interaction of composition and climate and pollution in the upper troposphere. This issue will outline five existed MLS instrument and analyze their adopted techniques for lower noise and higher sensitivity as well as their capabilities comparisons. In American, the Jet Propulsion Laboratory (JPL) has already developed three MLS instruments: the UARS-MLS, EOS-MLS and CAMEO-SMLS which is ready for launch in 2011. In Japan, its JEM/SMILES is the first MLS instrument to use superconductor-insulator-superconductor (SIS) mixers with a mechanical 4-K refrigerator in space. In Sweden, the millimeter and sub millimeter limb-emission sounder on Odin uses actively cooled Schottky receivers with auto-correlators and wide hand AOS.

Download Full-text