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ASASSN-V J181654.06-202117.6 campaign - Alert Notice 710

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weo
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ASASSN-V J181654.06-202117.6 campaign - Alert Notice 710

AAVSO Alert Notice 710 announces an observing campaign beginning now on the UXOR ASASSN-V J181654.06-202117.6. Please see the notice for details and observing instructions.

To stay informed about this campaign, subscribe to this forum thread (option 1 below under Subscribe) -  see feedback from the PI,  comments and questions from observers, and notes from AAVSO HQ. Add a post yourself  -  join in the discussion about this interesting target!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

VAastro
Airmass Question for ASASSN-V J181654.06-202117.6 campaign

Is Airmass greater than 2 useful  BVI observations for the campaign?

Thanks

Erik

dmvandam
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Hi Erik,

Hi Erik,

Right now yes, anything we can get we can use, and it's now mostly about getting as much data as possible. Thanks for reacting so quickly to this alert.

Thanks,

Dirk

dmvandam
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Hi Erik,

Hi Erik,

update on your previous question.. after some more thought it would be nice to keep the observations below airmass of 2,

Thanks,

Dirk

dmvandam
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Extra Information

If you are looking for extra information, this thread can also be found under Young Stellar Objects

nkrumm
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Time Series

I watched this target for 3 hours last night, taking CCD images in B, V, R, and I at about 9 minute intervals (see attached chart). The scatter in any of the bands was no more than about 0.02 mags, only slightly greater than the scatter for my check star (000-BNP-171). I would conclude, therefore, that any rapid variations (minutes to hours) for this target are no larger than a hundredth of a mag or so.

dmvandam
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Time Series

Hi Nathan,

Thank you so much for taking part in this campaign and providing lots of photometry for J1816 (shorthand for the longer star name). Even though the star seems stable (very clear from your data), my prefence is for the shortest cadence possible. Of course I understand if you're observing other interesting targets that you would want to spread your focus. Could I ask you to observe the star at least once per hour?

Thanks,

Dirk

nkrumm
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Time Series

I am glad these observations are useful. Unfortunately, observing from Southern California, there is only a 3-hour window when J1816 is above 30-deg elevation (airmass ~ 2). Are observations farther down in the "muck" still useful? Also, is it important to transform the observations, and if so, is there a preferred comparison star?

dmvandam
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I think we should keep the

I think we should keep the observations above airmass 2, it's unfortunate that it's just a 3 hour window, but anything we can get is much appreciated. I don't have a preferred comparison star

dmvandam
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Photometry from other Surveys

Hi everyone,

Just wanted to let you know that I obtained data from ATLAS, which lines up with the deepest part of the eclipse (along with data from VMT). I also have data from ASAS, which seems to show a similar dip in the past (more analysis needed). I'm working on reducing the LCOGT data to see if we can get more data to fill out the eclipse, and I'll keep you posted! Thanks all for staying on board

Kind regards,

Dirk

dmvandam
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Very Basic Plot

Hello everyone,

 

Just wanted to thank you all for observing J1816 and provide a very basic plot. I just took all the AAVSO, ASAS-SN, ASAS, and ATLAS data (I've been on holiday so didn't have the time to reduce the LCOGT data yet), and just removed the median for each observer and filter to get a kind of first order plot. It looks like the object is still crossing in front of the star, so if you can keep observing this would be much appreciated.

 

For some reason I can't seem to upload the file here, so I made a GitHub repository with the plot in it (basic_plot.png found at https://github.com/dmvandam/j1816)

 

Cheers,

Dirk

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