| Comet | C/2019 Y4 (ATLAS) |
|---|---|
| User | Jerzy Bohusz |
| User`s name | Jerzy Bohusz |
| Observation's time (UT) | 2020-04-21 23:16:00 |
| Tool | TNAk 250 mm |
| Observation's place | Myślin |
| Magnitude | 9.5 |
| Comparison stars source | TK - Tycho-2 Catalogue |
| Method | S - Sidgwick`s method |
| Coma diameter(') | 3.2 |
| Tail's length | 3' |
| Condensation | 1 |
| Positional angle of tail | 80 |
| Bortl's scale | Not set |
| Aperture | 25 cm |
| Focal length (mm) | 1175 |
| Type of tool | L - Newtonian reflector |
| Magnification | 90.4 |
| Field of view (°) | 0.72 |
| SQM-L in zenith | |
| Light pollution zone | |
| Lm | |
| Comment | |
| Morris Format | 2020 Apr 21.97 UT: m1=9.5, Dia.=3.2', DC=1, Tail: 3 arcmin, in PA 80 deg ...25-cm L (90.4x) ...Jerzy Bohusz (Myślin, Poland) |
