Standard Fields

General Technical Support
1

Can someone help me find the list of standard fields? I used to be able to get it at https://apps.aavso.org/vsd/stdfields but that page no longer includes the actual list.

2

List of standard fields is here, but where are their charts?

3

There used to be a list of fields where you could click on the fieldname and get the chart.

4

The standard fields chart option in VSP does not seem to be working. I see the introductory material but not the list of standard fields.

https://apps.aavso.org/vsd/stdfields

Clear skies,

John

5

I have a new set of Optolong UBVRcIc filters coming tomorrow. The VSP standard page is still empty missing the list of fields and links to associated charts and photometry. Entering obvious names like SA110 or SA 110 or SA-110 in VSP gives name errors.

I really need the standards data back. I donā€™t use the AAVSO tools but my own software tools. Getting older by the nightā€¦!

Jim (DEY)

6

(I merged a couple of separate threads into this topic since their subjects were identical.)

Pinging staff to let them know about the issue with standard fields: @aru @bkloppenborg

1 Like
7

Hi Lauren,

Iā€™ll try to release the fix today and tomorrow at the very latest.

Thanks,
Aru

2 Likes
8

The Standard Fields page is working again!!!
https://apps.aavso.org/vsd/stdfields

3 Likes
9

Woohoo! @AAVSO_Admin Great job on the fix, Aru, thanks so much for the quick attention! :slight_smile:

1 Like
10

I am looking at Standard Field SA38 (which I have printed earlier, see my post above) and comparing to the UBVRI PHOTOMETRIC STANDARD STARS AROUND THE SKY AT +50deg DECLINATION Arlo U. Landolt, The Astronomical Journal, 146:131 (41pp), 2013 November paper and notice that there are several stars missing from the AAVSO Standard Field Photometry page.

Have these been found to be variable or excluded for some other reason?

Many thanks to those maintaining the Standard Field resource. I have posted about it several times lately and donā€™t want to seem like Iā€™m complaining too much. Itā€™s a great resource and I miss it!

Clear skies,

John

1 Like
11

Maybe there is a cache problem or something on my end but it still is not working for me.

12

VSP standards page has only the top paragraphs showing as I write this. The list and links are absent.

Jim (DEY)

13

The standard fields are available now.

Thanks to HQ for fixing the issue.

1 Like
14

Thanks Roy, I can see the charts and photometry now.

15

After some investigation, and discussion with Robert Berrington, Associate Professor of Physics & Astronomy at Ball State University, I can answer my own question. The ā€œmissingā€ stars in the field were only observered on one night, and have no uncertainty estimate as a result.

Maybe it would be a worthy project to augment the observations and ultimately include these stars in the photometry table?

The subject stars are:

SA 38-298 18 50 31.101 +45 09 37.03
SA 38-302 18 50 33.197 +45 10 43.05
SA 38-303 18 50 34.221 +45 07 26.48
SA 38-304 18 50 36.293 +45 09 06.83
SA 38-149 18 50 41.729 +45 06 37.02

Clear skies,

John

16

That particular group among Arloā€™s SA 38 stars, besides having just the single observation by him, are also rather faint and have only a small range in color-index. SA 38 SF2 and SF3, although still not high-weight Landolt standards, are better suited for getting zero-points and color terms.

\Brian

1 Like
17

I canā€™t find the list of Standard Fields. Are the links broken again?

18

Iā€™m a bit lost to find access to plot or download appropriate standard fields to try to calibrate my V and R filter/camera combination.
The AAVSO standard fields page has only 1 link and turns in circles for me:

The link ā€˜hereā€™ brings me back to a page pointing back to the standards page.
I understand you should be able to find access to 1000/2000/3000/4000 idā€™s for standard fields, but I only find the links to original Landolt papers.

I also thought more ā€˜secondaryā€™ standard fields should be available in case you want to observe a standard field near a target of interest.

Thanks for any advice to find these data,

Tom

19

The links on the standard field page are definitely missing or broken again.
I hope AAVSO Admin can fix it soon,

Tom

21

OK, found this AAVSO page showing the equatorial Landolt fields:

But this doesnā€™t show how many stars per field or cluster and doesnā€™t give R-magnitudes, only B and V. Some of them have very few stars, seems difficult to make a reliable transformation plot.
So can they be used to calibrate/transform images with V and R filter to standard V?

Tom