SDSS photometric calibration

L'analyse des images.
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dan_adrian
Messages : 31
Enregistré le : 09 août 2021, 10:03

SDSS photometric calibration

Message par dan_adrian »

Hello,
I took some images using Astrodon Sloan g' r' i' photometric filters. Can I use Prism to do photometric calibration?
In the Analysis->Photometry->Automatic calibration, I cannot find a catalog that contains sloan magnitudes

Thank you
Marc DELDEM
Messages : 1269
Enregistré le : 20 juin 2009, 01:01

Re: SDSS photometric calibration

Message par Marc DELDEM »

Have a look at the UCAC4 catalog.

https://irsa.ipac.caltech.edu/data/UCAC4/ucac4.html
UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. [...] These data are supplemented by 2MASS photometric data for about 110 million stars and 5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric All-Sky Survey) for over 50 million stars.
g,r,i from APASS catalog are g',r',i' Sloan filters.

From Prism:
Image

From Aladin:
Image

From VizieR:
http://vizier.cds.unistra.fr/viz-bin/Vi ... c.rs=0.004
dan_adrian
Messages : 31
Enregistré le : 09 août 2021, 10:03

Re: SDSS photometric calibration

Message par dan_adrian »

Thank you Marc.
So the GRI magnitudes bellow are sloan?
Screenshot 2024-01-29 at 19.42.02.png
Marc DELDEM
Messages : 1269
Enregistré le : 20 juin 2009, 01:01

Re: SDSS photometric calibration

Message par Marc DELDEM »

dan_adrian a écrit : 29 janv. 2024, 19:46 So the GRI magnitudes bellow are sloan?
Yes I think so
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