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| Other abbreviations used |
| A | component A (alpha) of a double or multiple star |
| adj | adjacent |
| B | component B of a double or multiple star |
| B | (with number) Barnard's catalogue of dark nebula |
| C | component C of a multiple star |
| CC | concentration class for globular clusters, from I to XII |
| Cl | cluster(s) |
| cn* | central star of planetary nebula |
| CON | constellation see constellation list |
| d | degree |
| Dbl | double star |
| DEC | declination |
| dl | dark lane in galaxy or emission nebula |
| DN | dark nebula |
| EN | emission nebula |
| G | galaxy (with type) |
| Gal | Galaxy |
| GC | globular cluster |
| IC | Index catalogue |
| " | inch, e.g. a telescope of 8" aperture |
| inv | involved |
| LMC | Large Magellanic Cloud |
| M | Messier catalogue |
| m | visual magnitude |
| mag | visual magnitude |
| Mlt | multiple star |
| [name] | the originator of a descriptive name |
| NE | visible with the unaided eye |
| Neb | nebula |
| NGC | New General Catalogue |
| OC | open cluster |
| OIII | An Oxygen III nebular filter is recommended |
| p | photographic magnitude |
| PA | Positions Angles in degrees clockwise from north |
| Per | Period in days |
| PN | planetary nebula |
| Ri | rich in stars |
| RA | right ascension |
| RN | reflection nebula |
| SEP | Separation in arc seconds |
| SMC | Small Magellanic Cloud |
| SNR | Supernova remnant |
| st | star(s) |
| UHC | A filter passing both OIII and Hydrogen Beta is recommended |
| Var | Variable Star |
| | |
| Colors | |
| B | blue |
| W | white |
| Y | yellow |
| G | green |
| P | purple |
| O | orange. |
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