TCP J21290156+3631056: new transient (11.5 mag) in Cygnus
Posted: Sat Mar 24, 2018 12:43 pm
Hello,
During last night, I've spot this alert on aavso:
https://www.aavso.org/tcp-j212901563631 ... mag-cygnus
This night I've been already using the Lhires (found it quicker switching to 150/mm grating rather than switching to my existing Alpy), with a guide camera optimized for bright stars, hence spent a lot of time making sure about the target (poor guide quality).
Fresh result using ISIS: The object was low, I took ref.star of nearby 70 Cyg before and after (using average). Had to hurry, the 4th exposure of 600 sec (taken right after the 2nd 70 Cyg ref star) was effectively destroyed by the rising sun.
The peak at 4438A is either true, or might be an artifact of known defocus towards H-gamma by the internal doublet of LHires. Otherwise, you can assess visually the SNR as spikes amount allover the featureless continuum (only the telluric 6876A seems to be real, no outstanding Balmer feature visible).
I am wondering what kind of object this transient is, looks to be featureless and bluish.
Cheers,
Peter
During last night, I've spot this alert on aavso:
https://www.aavso.org/tcp-j212901563631 ... mag-cygnus
This night I've been already using the Lhires (found it quicker switching to 150/mm grating rather than switching to my existing Alpy), with a guide camera optimized for bright stars, hence spent a lot of time making sure about the target (poor guide quality).
Fresh result using ISIS: The object was low, I took ref.star of nearby 70 Cyg before and after (using average). Had to hurry, the 4th exposure of 600 sec (taken right after the 2nd 70 Cyg ref star) was effectively destroyed by the rising sun.
The peak at 4438A is either true, or might be an artifact of known defocus towards H-gamma by the internal doublet of LHires. Otherwise, you can assess visually the SNR as spikes amount allover the featureless continuum (only the telluric 6876A seems to be real, no outstanding Balmer feature visible).
I am wondering what kind of object this transient is, looks to be featureless and bluish.
Cheers,
Peter