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AAVSO Alert Notice 684 on V1491 Cyg campaign

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weo's picture
AAVSO Alert Notice 684 on V1491 Cyg campaign

AAVSO Alert Notice 684 announces a campaign beginning today on the TT Tau star V1491 Cyg. Please see the notice for details and observing instructions, which include submitting both FITS images and reduced photometry.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Able to Upload Images to HOYS-CAPS?

Hello! The alert asks that images be uploaded to and that data be uploaded to the AAVSO database.

    I applied for a log-in a couple of days ago, but have not heard back yet. Its Monday evening in England now.

    Have folks been able to upload images to HOYS-CAPS? Best regards.


Dear Mike, 

Dear Mike, 

I have seen you registered at Nov. 2, 2019, 1:48 p.m. on our site. This automatic process sends you a confirmation email to the adress you supplied. Could you please check if that email somehow ended up in your spam folder? If not, then please send me a direct email from the adress you want to use and I can try to set this up for you. I hope this helps.


Bikeman's picture
dimmest measurement so far


My measurement from the night Nov 30th to  Dec 1st are my dimmest so far, so without wanting to sound too excited  I'd say that a closer look might be in order, even tho  the campaign has, as I understand it, technically ended on the 30th of November? Unfortunately the weather is rather bad here in Germany atm.


Thanks, yes I have seen this

Thanks, yes I have seen this in our data as well. Indeed we will keep looking at it for the next few days to see what is happening.

Continued V1491Cyg Observations

Dear Everyone, 

this is to let you know that we are currently in the next potential occultation of the source, indeed it is ongoing since ~1week now, and we have continued interest in the monitoring of this source. Hence, please feel free to keep observing it.

Can I also please remind people to upload the images to our HOYS database in line with the originial instructions. I had a look through the AAVSO data for the source, and as far as I can tell there are a number of observers who so far have not send us the images (esp. DFS who monitored the object for the entire last half year). It is vital for us to have the images as it helps to work out colour dependent calibration off-sets which can only be picked up when having the brightness of all other stars in each image. This is many case improves the photometric accuracy significantly.

Thanks a lot, Dirk Froebrich, HOYS  PI.


weo's picture
Upload your images, please!

Hi Everyone,

I contacted the 15 observers who have submitted data on V1491 Cyg to date about uploading images. As Dr. Froebrich says in his post above, it is essential for him to have the images. Please upload your images per the instructions at the "Take Part" ( section of the HOYS website. You can view a help video that is linked to from there.

For all observers going forward, please upload your images to HOYS and submit photometry to the AAVSO International Database.

Many thanks, and Good observing,



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