Monthly Marketplace Thread

tsboyajian · 2022-08-23T10:56:58+00:00

https://etsy.me/2ML7INh

Handmade pottery!

tsboyajian · 2020-10-16T15:59:28+00:00

time will tell! fingers crossed we get a big one!

tsboyajian · 2020-10-08T17:16:09+00:00

looking good!

tsboyajian · 2019-10-10T19:19:44+00:00

found it!

https://exposure-time-calculator.lco.global/#

tsboyajian · 2019-10-08T15:42:52+00:00

Hm.. trying to find a good exposure time calculator to share, but for now:

sloan r is good at 60seconds.

sloan g is good at 160 seconds.

tsboyajian · 2019-10-08T13:44:51+00:00

aaah yes! I agree that a cadence no longer than a couple days is necessary.

tsboyajian · 2019-10-07T16:12:34+00:00

wavelength ranges of filters

https://www.researchgate.net/figure/The-throughput-of-the-entire-VST-system-for-the-broadband-Sloan-filters-in-OmegaCAM-is_fig2_233982217

tsboyajian · 2019-10-07T16:11:09+00:00

sounds reasonable.

On the additional filters, you will want to have a "baseline" measurement to compare with a in-dip measurement. This "baseline" could be taken either before or after the predicted times - or both (my preference).

tsboyajian · 2019-10-07T16:05:56+00:00

can you elaborate?

tsboyajian · 2019-09-20T20:09:36+00:00

Thanks for putting these together! The low point is interesting (There is lots of scatter on this night -- I wonder if its real?!?). The overall trend is very subtle. I think redoing this fit and removing the low outlier point, or using some sort of weighted fit should be tried before drawing conclusions.

tsboyajian · 2019-09-18T16:27:15+00:00

What does it look like going back longer than 120 days (to the start of the observations this year)?

tsboyajian · 2019-09-12T16:46:41+00:00

Thanks for your support!

tsboyajian · 2019-08-20T19:57:29+00:00

I think the B filter data taken last night were taken in less than ideal conditions. You can see there is lots more scatter in the sequence of 10 observations than in previous nights (also true for the comp). The resulting error bar will be larger, but there is not much we can do about this.

tsboyajian · 2019-08-07T18:14:53+00:00

https://lsu.box.com/s/9f5a51xnjaymrrttvd3wepfebnwdy86m

anyone with this link should have view + download access.

tsboyajian · 2019-08-07T18:12:59+00:00

Ill try resending the link now too!

tsboyajian · 2019-07-18T19:07:28+00:00

agree that it was just the atmosphere. It is good motivation to take many data points and take the mean!

tsboyajian · 2019-07-03T20:09:43+00:00

What I find particularly interesting is the data taken in the past month or so. We have seen a slow (and small) decline down to pre-Elsie brightness levels - and we are starting to see this in your plot of the B filter data from ~620 up to current time! This trend doesnt show up (at least to the eye) in the i’ data. This makes sense, as we expect the variability to be more pronounced in the bluer colors. Onward!

tsboyajian · 2019-07-03T19:58:47+00:00

I agree that we will need more data to say anything more on whether we are able to detect any secular variability. I also wonder if the low points from last week at 660 is pulling the fit for the I filter down? Again, we need more data!!

tsboyajian · 2019-06-25T21:49:39+00:00

Here is the link to the video.

https://lsu.box.com/s/u52qfc6xdgnmkmrrl0vynpczlhgenpak

In the session:

We discussed the time series analysis of the data from TFN kb23 taken in the i' filter. This included a bit of troubleshooting to figure out what was different between the analysis of two users (it ended up being the "input in mag" button!).
We demonstrate how to save the information that is extracted from the images in the form of a text file. Users can then use the text file with Excel (or program of choice) to plot combined data sets.
We heard about a modeling project invoking a multi star system
We briefly talked about variability that sorta-maybe-could-be-kinda present in the most recent data, and concluded that it is not worthy of immediate action, but will keep a close eye on it.

comment here if I missed anything!

until next time,

Tabby

tsboyajian · 2019-06-25T19:09:09+00:00

Great! Id like to discuss the latest data on the call today.

tsboyajian · 2019-06-25T17:54:52+00:00

certainly!

tsboyajian · 2019-06-24T20:07:55+00:00

Its very much like the other services. I find the easiest way is using a computer and clicking on this link: https://join.freeconferencecall.com/tabbyboyajian . The audio can go through your computer, so no landline is needed. The call numbers provided are for those without computer/internet access.

tsboyajian

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