I have seen the letter F and the abbreviation Teff mentioned in meteor reports. What do they represent?
[NOTE: What follows is a simplified explanation of F and Teff. For a further discussion, see Chapter 2 of the NAMN Guide.] Portions of the sky may be blocked by buildings, trees or clouds. If any of these obstruct the area of sky you are watching (known as the field of view), it will reduce the number of meteors you see. To account for this, observers record the percentage of their field of view that is blocked, and include it on their report as the letter “F”. Normally, an observing period should be a minimum of one hour in length. Keep in mind that if you take a break during this period you must subtract this time from the observing period. Clouds moving through your field of view and forcing you to stop observing must also be accounted for in a similar manner. What is left, the time you spend actually watching the sky and recording meteors, is known as “effective observing time”, and is abbreviated as “Teff”. I would like to begin observing meteors, what should be my next step? Ther
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