Space and Solar Definitions - N
Nadir - The direction from a spacecraft directly down toward the center of a planet. Opposite the zenith.
Nanotesla (Nt) - A unit of magnetism 10.0e-09 tesla, equivalent to a gamma (10.0e-05 gauss).s
NASA - National Aeronautics and Space Administration.
NE - Near Encounter phase in flyby mission operations.
Neptune - Eighth planet from the sun, a gas giant or Jovian planet.
Neutral Line - The line that separates longitudinal magnetic fields of oppo- site polarity.
NiCad - Nickel-cadmium rechargeable battery.
NIMS - Near-Infrared Mapping Spectrometer onboard the Galileo spacecraft.
NIST - National Institute of Standards.
nm - Nanometer (10-9 m).
NMC - Network Monitor and Control subsystem in DSN.
NOCC - DSN Network Operations Control Center at JPL.
Nodes - Points where an orbit crosses a plane.
Non-coherent - Communications mode wherein a spacecraft generates its downlink frequency independent of any uplink frequency.
NRZ - Non-return to zero. Modulation scheme in which a phase deviation is held for a period of time in order to represent a data symbol.
Nucleus - The central body of a comet.
Nutation - A small nodding motion in a rotating body. Earth's nutation has a period of 18.6 years and an amplitude of 9.2 arc seconds
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