[Aavso-photometry] Questions about observation time and air mass

[Michael Newberry]

Michael,

Just out of curiosity. what do you get from Mira's Airmass Calculator?

Michael Newberry

----- Original Message ----- 
From: "Michael Koppelman" <lolife at bitstream.net>
To: "Barbara G. Harris" <barbharris1 at hughes.net>
Cc: "AAVSO Photometry" <aavso-photometry at mira.aavso.org>
Sent: Tuesday, May 22, 2007 2:20 PM
Subject: Re: [Aavso-photometry] Questions about observation time and air 
mass


> On May 22, 2007, at 3:19 PM, Barbara G. Harris wrote:
>
>> 1.        This may be splitting hairs but should I report the start
>> of the
>> observation or the mid time of the exposure for the observation time?
>
> Mid. It's a good idea to test your software to make sure you know
> what it is doing.
>
>> 2.       I know AAVSO has an air mass calculator but I use the Sky
>> 6 for
>> telescope control and in the object information window they have
>> air mass
>> for the object.  The few times I have compared it to the online air
>> mass
>> calculator they have been very close (1.21 given by the Sky 6 and
>> on line
>> calculator gave 1.2085).  Is the Sky 6 value close enough to report or
>> should I stick with the online air mass calculator?
>
> 1.21=1.2085 to the reported significant digits. 2 digits after the
> decimal point is probably, in general, plenty for airmass, so you are
> fine either way.
>
> Cheers,
> Michael
> http://www.lolife.com/astronomy/
>
>
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