AB Aur campaign supporting HST observations - Alert Notice 809

Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 01/17/2023 - 23:14

AAVSO Alert Notice 809 announces an observing campaign on the YSO AB Aur beginning immediately. Please see the notice for details and observing instructions.

There are threads for this campaign under the following AAVSO forums:

- Campaigns & Observation Reports: https://www.aavso.org/ab-aur-campaign-2023
- Young Stellar Objects: https://www.aavso.org/ab-aur-campaign-2023-01

Please subscribe to these threads if you are participating in the campaign so you can be updated. Join in the discussion or ask questions there!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

 

Affiliation
American Association of Variable Star Observers (AAVSO)
Question on Ha filter and data values

I've just started using my Ha filter and wanted to participate in this but also didn't want to upload data that was incorrect. How can I tell if my data is in the ballpark. I just pulled a couple of images, stacked them and ran the report using stars 116 and 120 as specified and came up with a magnitude of 8.959. I'll be submitting B,V, and Ha data every couple of days. But again, I didn't want to populate the database with erroneous data. Err was .0001 with a SNR of 766.

Affiliation
American Association of Variable Star Observers (AAVSO)
JM,

I just did a quick…

JM,

I just did a quick check of my images from last night and I get the following numbers.

B = 7.235

V = 7.093

Ha = 6.654

These are before stacking and won't be what I ultimately submit but wanted to at least be able to give a little preliminary feedback.  My checkstar numbers for the 120 star are pretty close to the AAVSO numbers so my magnitudes above I think are decent.  Is it the Ha filter that you get 8.959? 

One possible explanation is that AB Aur is overexposed in your images and so shows up fainter in your photometry.  That said, the S/N of 766 doesn't like overexposed.

What magnitude do you get for the check star?

-Walt Cooney (cwt)

Affiliation
American Association of Variable Star Observers (AAVSO)
AB Aur

Thanks for the help and values. Just looked at my last night results and they are very close to your observations. Not sure what the problem was but I'll just have to watch the future observations closely.

Affiliation
American Association of Variable Star Observers (AAVSO)
Question about HA filter

I have taken images with ITelescope T24 and HA_3nm narrowband filter. The HA values are about 0.3 magnitudes brighter than with my own measurements with HA_7nm narrowband filter. Has anyone made similar experiences, or do I still have an error in my evaluations?

Thanks

Gerd