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Congrats to Dave Grennan on his SN discovery.

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13 years 9 months ago #86787 by dmcdona
You were using an R filter? Must've brightened lot then. I took images the other night which I must process...

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  • carlobeirnes
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13 years 9 months ago #86792 by carlobeirnes
Replied by carlobeirnes on topic Re:Congrats to Dave Grennan on his SN discovery.
dmcdona wrote:

You were using an R filter? Must've brightened lot then. I took images the other night which I must process...


Hi Dave,

I didn't use any filters for this measurement.

Carl.

Carl O’Beirnes,
Scopes and Space Ltd,
Unit A8 Airside Enterprise Centre,
Swords, Co Dublin,
Ireland.
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13 years 9 months ago #86793 by dmcdona
carlobeirnes wrote:

I didn't use any filters for this measurement.


I saw the R at the end of the one-liner and thought that's what you'd done... Sorry.

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13 years 9 months ago #86803 by phoenix

I didn't use any filters for this measurement.


Take the R out of your MPC observations Carl since some people will use the R data and get skewed results. I used to put C for no filter but now you just leave out the letter for no filter.

If you use fitsblink to check residuals leave in the filter letter otherwise it does not work.

Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/

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  • DaveGrennan
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13 years 9 months ago #86813 by DaveGrennan
Replied by DaveGrennan on topic Re:Congrats to Dave Grennan on his SN discovery.
phoenix wrote:

I didn't use any filters for this measurement.


Take the R out of your MPC observations Carl since some people will use the R data and get skewed results. I used to put C for no filter but now you just leave out the letter for no filter.

If you use fitsblink to check residuals leave in the filter letter otherwise it does not work.


Kieran,

Be careful, You cannot use C any more it has been defunct for a couple of months now. There is no specific code for unfiltered or clear filters any more. I note that all the regular observers are now using R (and this is what is being recommended on MPML) when unfiltered or clear filter magnitudes are being reported. I am thinking of getting a V filter as V is still valid, but should not be used for unfiltered estimates.

Dave.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
Equipment List here

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  • DaveGrennan
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13 years 9 months ago #86814 by DaveGrennan
Replied by DaveGrennan on topic Re:Congrats to Dave Grennan on his SN discovery.
I forgot to add the reason why the 'C' filter was removed. It is a common misconception that the filter code refers to the filter you used for the observation. It does not. It refers to the bandpass of the filter used for the reference star catalog used for the magnitude estimate. Since there are no catalogs which use a C filter it was removed. If you send in observations with C they will be rejected.

Dave.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
Equipment List here

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