| Comet | 123P/West-Hartley
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| User | Koalin |
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| User`s name | |
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| Observation's time (UT) | 2019-04-01 21:40 |
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| Tool | Sky-Watcher 12 Inch Dobsonian Telescope |
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| Observation's place | Деревня Dindos, Ignalinos район, Литва |
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| Comparison stars source | TK - Tycho-2 Catalogue |
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| Method | S - Sidgwick`s method |
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| Magnitude | 12.8 |
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| Coma diameter(') | 1 |
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| Tail's length | Not set |
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| Condensation | 2.5 |
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| Positional angle of tail | Not set |
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| Bortl's scale | Not set |
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| Aperture | 30.5 |
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| Focal length (mm) | 1500 |
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| Type of tool | L - Newtonian reflector |
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| Magnification | 123.3 |
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| Field of view (°) | 0.58 |
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| SQM-L in zenith | |
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| Light pollution zone | |
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| Lm | |
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| Comment | Min mag star 15,1m
Смотрится приятно. |
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| Morris Format | 2019 Apr 1.9 UT: m1=12.8, Dia.=1', DC=2.5 ...30.5-cm L (123.3x) ...Darius Gasiūnas (Деревня Dindos, Ignalinos район, Литва, ) |
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