[Aavso-photometry] Short-Exposure Photometry

[Radu Corlan]

On Tue, 13 Jul 2004, Michael Koppelman wrote:

> Interesting. I was near A=1.0, D=16cm for me and t=10s and this give me 
> an answer of 0.02. I presume that is magnitudes? 

It's the relative error (which for small numbers is the same in magnitudes 
or flux units).

> If so, it seems pretty close. I think I was at about 0.03.
> 
> Thanks, that is interesting.

It's a pretty good formula. Thank Dravins ;-). 

Radu

> 
> Michael
> 
> On Jul 13, 2004, at 3:27 PM, Radu Corlan wrote:
> 
> > I use the following formula for estimating scintillation (by Dravins i
> > think):
> >
> > scint = (0.09 * A ^ 1.75) / (D ^ 0.66 * sqrt(2 * t))
> >
> > Where A is the airmass, D is the aperture in cm, t is the integartion 
> > time
> > in seconds. This formula excludes a correction for altitude (which only
> > becomes significant above 1000-2000m or so). Scintillation also 
> > depends on
> > local conditions, of course - a factor of 0.5..3.0 could apply. But 
> > it;s
> > never an order of magnitude better (or worse).
> 
> 

-- 

-------------
Radu Corlan       Snail Mail: Bucuresti sect. 1, 
rcorlan at pcnet.ro  str. Argentina nr. 28, Romania

   You can still escape the "Gates" of Hell!   
                 Use Linux!