- #1
randa177
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Does anyone have any idea how to get the photometry of SDSS data?
Photometry of SDSS Data: A How-To Guide
- Thread starter randa177
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In summary, photometry is a method used to measure the brightness of objects in astronomical images. The Sloan Digital Sky Survey (SDSS) provides a wealth of data for photometric analysis, including precise measurements of the magnitudes and colors of millions of objects. This guide outlines the steps for performing photometry on SDSS data, including how to retrieve the data, calibrate the images, and extract photometric measurements. By following these steps, researchers can effectively analyze SDSS data to gain insights into the properties and distributions of celestial objects.
- #2
Nereid
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From http://cas.sdss.org/dr6/en/" .randa177 said:
Is there anything in particular that you are looking for?
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- #3
randa177
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Actually I would like to find the spectra and photometry for a set of objects,
I can find the spectra here:
http://www.sdss.org/dr6/tutorials/colorconstraints.html
I am wondering if I can find the photometry in a similar way?
I can find the spectra here:
http://www.sdss.org/dr6/tutorials/colorconstraints.html
I am wondering if I can find the photometry in a similar way?
- #4
randa177
- 91
- 1
Is there anything in particular that you are looking for?
Actually I would like to find the spectra and photometry for a set of objects,
I can find the spectra here:
http://www.sdss.org/dr6/tutorials/colorconstraints.html
I am wondering if I can find the photometry in a similar way?
Actually I would like to find the spectra and photometry for a set of objects,
I can find the spectra here:
http://www.sdss.org/dr6/tutorials/colorconstraints.html
I am wondering if I can find the photometry in a similar way?
- #5
Nereid
Staff Emeritus
Science Advisor
Gold Member
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Do you have the ObjID of the objects?randa177 said:
If so, then it's a piece of cake! Just use http://cas.sdss.org/astro/en/tools/explore/obj.asp" .
For example, ObjID is 588298663036649507, http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588298663036649507"'s what the Explore tool gives you, complete with spectra AND photometry!
If you don't know the ObjID, but do know the RA and Dec, then it's just one more step ...
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1. What is photometry and why is it important in SDSS data analysis?
Photometry is the measurement of the brightness of an object in an image. In SDSS data analysis, it allows us to determine the brightness and color of celestial objects, which can provide valuable information about their characteristics and properties.
2. How does SDSS data collection and processing affect photometry results?
SDSS data is collected using a specialized telescope and camera, and is processed through a series of algorithms to correct for various factors such as atmospheric effects and instrument noise. These processes can impact the accuracy of photometry results, so it is important to understand how they work and how they may affect the data.
3. What is the difference between aperture and PSF photometry?
Aperture photometry measures the total amount of light within a fixed area around an object, while PSF (point spread function) photometry measures the amount of light within the shape of the object's point spread function. PSF photometry is more accurate for crowded fields, while aperture photometry may be more suitable for isolated objects.
4. What are some common challenges in photometry analysis and how can they be addressed?
Some common challenges in photometry analysis include background subtraction, object deblending, and dealing with variable atmospheric conditions. These can be addressed by using specialized software and techniques, such as fitting a model to the background and utilizing image stacking to improve signal-to-noise ratio.
5. How can photometric data from SDSS be used in scientific research?
Photometric data from SDSS can be used in a variety of scientific research, such as studying the properties and evolution of galaxies, searching for new astronomical objects, and analyzing the composition and dynamics of stellar systems. It can also be combined with data from other surveys and telescopes for more comprehensive analyses.
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