Re: Perform Differential Relative Photometry on a Time Series of Images
Posted by karenacollins on May 25, 2018; 10:47pm
URL: http://astroimagej.170.s1.nabble.com/Perform-Differential-Relative-Photometry-on-a-Time-Series-of-Images-tp234p1011.html
Hi Ganesh,
I think you are still having trouble with your time axis data column. However, you should disable V.Marker 1 and V.Marker 2 at the top right of Multi-plot Main. Those produce the red dasked vertical lines and are included in the x-axis autoscaling. Nevertheless, it appears that all of your x-axis data column values are zero. You can look at the selected data column values in the measurements table display to see the numbers. As I mentioned previously, you can plot the photometry sequentially by selecting the "blank" data column for the x-axis.
The values on the y-axis are centered around 1.0 because you apparently have a normalization mode turned on in the Multi-plot Y-data panel for that plot row.
All of the details of plotting are more than I can go into here. However, there is a really nice and detailed step-by-step manual that was put together by an AAVSO lead member, Dennis Conti, here:
http://www.astrodennis.com
at the first link on the page. Dennis also provides some tutorial example files to use to go through the step-by-step guide the first time. I think if you could go through that exercise, it would give you all of the insight that you need to fully utilize AIJ's photometry and plotting capabilities.
Once you have been through that exercise, lets' pick back up on any remaining questions you may have.
Karen
URL: http://astroimagej.170.s1.nabble.com/Perform-Differential-Relative-Photometry-on-a-Time-Series-of-Images-tp234p1011.html
Hi Ganesh,
I think you are still having trouble with your time axis data column. However, you should disable V.Marker 1 and V.Marker 2 at the top right of Multi-plot Main. Those produce the red dasked vertical lines and are included in the x-axis autoscaling. Nevertheless, it appears that all of your x-axis data column values are zero. You can look at the selected data column values in the measurements table display to see the numbers. As I mentioned previously, you can plot the photometry sequentially by selecting the "blank" data column for the x-axis.
The values on the y-axis are centered around 1.0 because you apparently have a normalization mode turned on in the Multi-plot Y-data panel for that plot row.
All of the details of plotting are more than I can go into here. However, there is a really nice and detailed step-by-step manual that was put together by an AAVSO lead member, Dennis Conti, here:
http://www.astrodennis.com
at the first link on the page. Dennis also provides some tutorial example files to use to go through the step-by-step guide the first time. I think if you could go through that exercise, it would give you all of the insight that you need to fully utilize AIJ's photometry and plotting capabilities.
Once you have been through that exercise, lets' pick back up on any remaining questions you may have.
Karen
On 5/25/2018 6:06 AM, Ganesh [via AstroImageJ] wrote:
Hi Karen,
I've try as you said but still no success & now it's showing mag as +1. But it's actually between 9.2 to 9.4.
Please look into this.
Regards,
Ganesh Pawar
If you reply to this email, your message will be added to the discussion below:http://astroimagej.1065399.n5.nabble.com/Perform-Differential-Relative-Photometry-on-a-Time-Series-of-Images-tp234p1010.htmlTo start a new topic under How to accomplish specific tasks in AstroImageJ, email [hidden email]
To unsubscribe from AstroImageJ, click here.
NAML
| Free forum by Nabble | Edit this page |