| Indicates whether object is inside a mask and if so, why. |
| name | type | description |
| fInsideMask | F | Returns the InsideMask value corresponding to a name |
| fInsideMaskN | F | Returns the expanded InsideMask corresponding to the bits, as a string |
| name | value | description |
| INMASK_NOT_IN_MASK | 0x00 | Not inside a mask. |
| INMASK_BLEEDING | 0x01 | Bleeding trail. |
| INMASK_BRIGHT_STAR | 0x02 | Object is bright star or near one. |
| INMASK_TRAIL | 0x04 | Object masked due to nearby trail. |
| INMASK_HOLE | 0x08 | Hole mask. |
| INMASK_POOR_SEEING | 0x10 | Seeing > 1.7". |
| INMASK_BAD_SEEING | 0x20 | Seeing > 2.0". |