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Abbreviations for Comments on AAVSO Reports
These comment letters go in the "Key" field on the paper AAVSO report form, or in the "Comment Code" field in electronic report files. If needed, use more than one letter, keeping them in alphabetical order. The letters should serve as a general guide to your comment; they needn't be an exact representation of what's in the report. For example, if you note in the "Remarks" field "a 12-day moon nearby", just put an "M" (for moon). | : | Uncertain | | ? | (do not use this symbol) | | A | AAVSO Atlas | | B | Sky is bright, twilight, light pollution, aurorae | | F | Unconventional method (out of focus, visual photometer, etc.) | | G | Non-AAVSO chart with Guide Star Catalog magnitudes | | H | Haze, mist, fog | | I | Identification of star is uncertain | | J | Non-AAVSO chart with HIPPARCOS magnitudes | | K | Non-AAVSO chart or sequence used | | L | Low in sky, horizon, trees, obstruction | | M | Moon present or interferes | | N | Angle, position angle | | O | "Other" comment - MUST be explained in EXPLANATION field | | R | Color comment (star is red, blue, etc.) | | S | Comparison sequence comment or problem; do not use for non-AAVSO sequence | | T | Non-AAVSO chart with TYCHO magnitudes | | U | Clouds | | V | Faint star, glimpse, near limit | | W | Weather (includes wind), poor seeing in general | | Y | Activity in star - outburst, fading, flare, unusual behavior | | Z | Possibly erroneous, doubtful, observer fatigue | These multiple-letter comment abbreviations go in the "Key" field on the paper AAVSO report form, or in the "Comment Code" field in electronic report files. If you must use a one-letter abbreviation as well as a multiple-letter comment, skip a space between the two codes.
| Blue | Blue filter used for the observation |
| CCD | Charge-coupled device (unfiltered)
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| CCDB | Charge-coupled device (Johnson blue filter)
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| CCDI | Charge-coupled device (Cousins infrared filter)
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| CCDK | Charge-coupled device (with K filter)
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| CCDO | Charge-coupled device (orange filter)
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| CCDR | Charge-coupled device (Cousins red filter)
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| CCDU | Charge-coupled device (Johnshon ultraviolet filter)
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| CCDV | Charge-coupled device (Johnson visual filter)
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| CCD-IR | Charge-coupled device (with IR-blocking filter)
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| COMB | Observation is of nuclear and nebulous regions COMBined
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| CR | Charge-coupled device (unfiltered - magnitude reduced using R sequence)
| | CV | Charge-coupled device (unfiltered - magnitude reduced using V sequence)
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| Green | Green filter used for the observation
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| NUC | Observation is of the NUClear region
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| PEPB | Photoelectric photometer (Johnson blue filter)
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| PEPH | Photoelectric photometer (with H filter)
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| PEPJ | Photoelectric photometer (with J filter)
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| PEPV | Photoelectric photometer (visual band)
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| PTG | Photographic observation
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| PV | Photovisual observation
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| RED | Red filter used
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| YELLOW | Yellow filter used
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