Affiliation
Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) (VVS)
Mon, 08/31/2015 - 19:51
Hi,
V498 Vul lies very near M27. Its first recorded outburst was 10 years ago. Every possible night I'm looking at the images taken by the BRT hoping to catch another outburst. I've noticed at the moment I'm the only one following the object... Hopelully more will try to follow it...
Are there more CV's (f.e. AL Com) known that lie close to those 'static objects'...?
Cheers,
Eddy
Hello Eddy,
well, CP Dra is quite close to the galaxy, NGC3147. In times past, people thought it might have been a supernova. We now know, of course, that it is an SU UMa dwarf nova. I like the field with the galaxy and always enjoy returning to it.
Good luck with your search for an outburst of V498 Vul. I am currently finding the typical time between return visits to the same CV field with the BRT CVs is something like 3 weeks - not a particularly conducive cadence for CV outbursts.
Go well!
Jeremy
Dear Eddy,
It depends how big FOV you have.
A few years ago I made (and still updating regularly) a databe of bright galaxies that inculdes a field where I list some variables (not only CVs) visible at most 2.5 degrees from these variables. I attach the latest version.
Just some other CVs from my list:
- ASASSN-15ni: 4' from NGC 6680
- AT Cnc: 12,8' from IC 508
- FN And: 40' from NGC 404
- CY Lyr: 17.25' from PGC 62506 (UGC 11370) and 28.45' from NGC 6710.
Not in the list, because M27 is not a galaxy, but SW Vul lies only ~15' from M27.
Clear skies,
Robert
Thanks for the list! I started on one myself but didn't get very far so this will be very helpful.
I noticed that one of my favorites is not listed. M81 is a popular target for astrophotographers so I recently pointed out a beautiful eclipsing variable nearby: ES UMA. Since astrophotographers usually do long time series of M81, I did photometry of this variable to capture the light curve. So if exposure times are set correctly, the variable can be measured and still collect lots of photons to create a pretty picture.
Clear Skies,
Vance
Well, this is not a comprehensive list, and I was mainly focusing on bright CVs and LPVs. Of course eclipsing variables could also be included in the future. Maybe we can create a google spreadsheat for collaborative updating the list if you want.
Another option: we can include other type deep sky objects as well. (Since in my Skywatcher EQ5 GOTO set only pre-defined 25 user object can be set, I made a list for myself including other type deep-sky objects in the FOV my Vendégcsillagkereső /Gues Star Hunter/ Programme.)
Please find attached the list.
Btw., if it's M81, then don't forget CH UMa (save FOV for my 300mm /zoom/ telephoto lens).
Btw there is a nice mira variable in the FOV of M27 too (Range: 14.4: - 17.5: Rc, Period: 214 days).
Here you can see it marked on an astrophoto:
https://www.flickr.com/photos/26731206@N05/18956553649/
Clear skies,
Robert