Annotation of Objects for Widefield Images

[S Eigell]

It seems that there is some built-in threshold over which only Constellation-level Annotations are posted to Widefield Image Plate-Solves via nova.astrometry.net.

(http://nova.astrometry.net/user_images/208128#annotated - while Constellation IC NGC M and Star catalog object Tags were generated, only Constellation Lines were plotted onto Annotated Image)

Is the threshold a factor of FOV size ??  What value ??

Is an override presented anywhere within the nova.astrometry.net plate-solver UI ??

While the Star annotations would easily overwhelm the image, I'd love to see the large number of cataloged DSOs for this rich field...

[Dustin Lang]

Hi,

Being smarter (or letting the user choose) about labelling objects has been a long-time to-do item.

There are indeed a number of thresholds: the code is here in the annotated_image function:
http://astrometry.net/svn/trunk/src/astrometry/net/views/image.py

if rad > 10:
        args.append('--no-ngc')

	if rad > 30:
		args.append('--no-bright')

One option would be to download the Astrometry.net code and produce your own annotations -- the web service just runs the program "plotann.py" in the blind/ directory.

--dustin

[S Eigell]

Thanks,

But as my local astrometry.net is courtesy of an AstroTortilla installation with pre-compiled .exe and .dll resources (of an older code release - 0.38), I'll probably live with the knowledge that I need to use narrower sub-images (submitted to nova.astrometry.net - until AT updates to a build with the proper "plot-any -B" fix).  Chasing a proper build environment is a bit outside my current commitment level...