| Comet | C/2009 P1 (Garradd) |
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| User | chergen |
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| User`s name | Carl Hergenrother |
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| Observation's time (UT) | 2013-01-20 07:55:00 |
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| Observation's place | Not set |
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| Comparison stars source | ICQ: U4. UCAC4 photometry catalog |
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| Method | Z |
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| Magnitude | 13.5 |
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| Mag Error | Not set |
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| Coma diameter(') | 3.1 |
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| Tail's length | 4.9' |
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| Coma degree of condensation | Not set |
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| Positional angle of tail (°) | 13 |
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| Aperture | 183. cm |
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| Telescope focal length (mm) | 16470 |
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| Telecope Type | Y |
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| Exposure of single frame (sec) | 540 |
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| Phot Region | comparison stars are in the same frame as a comet |
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| Software (with version) | ICQ: IRA. IRAF |
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| Stars Exposure | Not set |
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| Photometric-aperture size | ○ 3.1' |
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| Camera | |
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| Chip | |
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| Chip blooming | |
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| Number of images | 3 |
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| Magnitude of the comparison star closest in brightness | Not set |
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| Calibration methods | dark-subtracted (and bias-subtracted) + flat-field corrected (flat-fielded) |
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| Pixel size width | 0.4" |
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| Pixel size height | 0.4" |
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| Light pollution zone | Not set |
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| Lm | Not set |
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| SQM-L in zenith | Not set |
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| Observatory code | |
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| Comment | Not set |
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