astronomy
951 abbreviations
| Abbreviation | Meaning | |
|---|---|---|
| NEA | (celestial object) Near-Earth Asteroid | |
| NEAP | (spacecraft) Near Earth Asteroid Prospector, a space probe used to study a near-Earth asteroid | |
| NEAR | (spacecraft) Near Earth Asteroid Rendezvous, a space probe used to study a near-Earth asteroid | |
| NEAT | (observing program) Near-Earth Asteroid Tracking | |
| NED | (software) NASA/IPAC Extragalactic Database | |
| NEMP | (celestial object) Nitrogen-Enhanced Metal-Poor star, a type of Carbon star with high amounts of nitrogen | |
| NEO | (celestial object) Near-Earth Object | |
| NEODyS | (organization) Near Earth Objects Dynamic Site, an Italian web-based service that provides information on near-Earth asteroids | |
| NEOIC | (organization) Near Earth Object Information Center, a United Kingdom organization that provides information on near-Earth asteroids | |
| NESS | (telescope) Near Earth Space Surveillance, a telescope for observing near-Earth asteroids | |
| NESSI | (organization) Near Earth Space Surveillance Initiative, a collaboration planning to use a ground-based telescope to observe near-Earth asteroids | |
| NGC | (catalog) New General Catalog | |
| NGST | (telescope) Next Generation Space Telescope, an older name for the James Webb Space Telescope | |
| NHICAT | (catalog) Northern HIPASS CATalog, the northern extension of the HIPASS catalogue | |
| NICMOS | (instrumentation) Near Infrared Camera / Multi Object Spectrometer, an infrared instrument on the Hubble Space Telescope | |
| NIMS | (instrumentation) Near-Infrared Mapping Spectrometer, an instrument on the Galileo spacecraft | |
| NIR | (astrophysics terminology) Near-InfraRed | |
| NIST | (organization) National Institute of Standards and Technology | |
| NLTE | (astrophysics terminology) Non-Local Thermodynamic Equilibrium, situations where the temperature, pressure, etc. of a system are not in equilibrium | |
| NLTT | (catalog) New Luyten Two-Tenths, a catalog of stars with high proper motions | |
| NOAA | (organization) National Oceanic and Atmospheric Administration | |
| NOAO | (organization) National Optical Astronomy Observatories | |
| NODO | (telescope) NASA Orbital Debris Observatory, a now-defunct telescope used to observe space junk and other objects | |
| NOT | (telescope) NOrdic Telescope | |
| NPS | (celestial object) North Polar Sequence, a series of stars near the North Celestial Pole once used as standards for measuring magnitudes | |
| NRAO | (organization) National Radio Astronomy Observatory | |
| NRL | (organization) Naval Research Laboratory | |
| NS | (celestial object) Neutron Star | |
| NSF | (organization) National Science Foundation | |
| NSO | (organization) National Solar Observatory | |
| NSSDC | (organization) National Space Science Data Center | |
| NSV | (catalog) New Suspected Variable, a catalog of variable stars | |
| NT | (astrophysics terminology) Non-Thermal, radiation that is not related to the emission source's temperature (such as synchrotron radiation) | |
| NTT | (telescope) New Technology Telescope, a telescope operated by the European Southern Observatory | |
| OAO | (observatory) Okayama Astrophysical Observatory, in Japan | |
| OAO | (telescope) Orbiting Astronomical Observatory, a series of satellites with astronomical instruments that operated in the 1970s | |
| OC | (celestial object) Open Cluster, a cluster of stars | |
| OCA | (organization) Observatoire de la Côte d'Azur | |
| OCO | (celestial object) Oort Cloud Object, an object (usually a comet) in the Oort cloud | |
| OGLE | (observing program/catalog) Optical Gravitational Lensing Experiment, an observing program to survey the sky for microlensing events; also the catalog of sources produced by the project | |
| OPAG | (organization) Outer Planets Assessment Group, a group established by NASA that provides advice on solar system exploration | |
| ORFEUS | (telescope) Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer, an ultraviolet space telescope that could be released and later retrieved by the Space Shuttle | |
| OSSE | (instrumentation) Oriented Scintillation Spectrometer Experiment, an instrument on the Compton Gamma Ray Observatory | |
| OTA | (instrumentation) Optical Telescope Assembly, the optics of the Hubble Space Telescope | |
| OVV | (celestial object) An Optically Violent Variable quasar. | |
| OWL | (telescope) Orbiting Wide-angle Light-collectors, two satellites that will work together to observe cosmic rays hitting the Earth's atmosphere | |
| OWL | (telescope) OverWhelmingly Large Telescope, a proposed telescope with a primary mirror with a width of 100 m | |
| P60 | (telescope) Palomar 60-inch telescope | |
| PA | (astrophysics terminology) Position Angle | |
| PAH | (astrophysics terminology) Polycyclic Aromatic Hydrocarbon |