Proposal #319

Target:
N Sgr 2023 (TCP J17562787-1714548)

Requested filters:
B, V, R, I

Exposition times:
I would request single images per filter and N Sgr 2023 to have SNR greater than about 50, close to 100. If the telescope does not allow it, would request several images to be taken (which could be later stacked) and uploaded to my VPhot account. Exp. time would have to be gradually increased as the star becomes fainter. In general, stars of magnitude 20 in B and V band should preferably have SNR greater than about 50, close to 100 (if technically possible).
Disclaimer: "Maximum Magnitude" and "Minimum Magnitude" sections below had to be completed - please do not suggest them.

Observation cadence:
Daily (if time is available).

Observations start date:
As soon as possible.

Expiration date:
When the star becomes too faint to observe. Nevertheless, I would like to set 2023/05/31 (YYYY-MM-DD) as the formal/official date in case that it will then still be observable.

This proposal is a response to "Alert Notice 813: Nova in Sagittarius: N Sgr 2023 = TCP J17562787-1714548". My goal is to support visual and CCD observations that are already being conducted (Pearce, Andrew: B,I,R,V,Vis; Romanov, Filipp: B,I,R,V; Cseh, Viktor: TG) and to provide their continuity when the object becomes too faint for most telescopes to observe.

Currently, FSM-OC61 is the only AAVSOnet's site that can observe N Sgr 2023 in upcoming weeks (and months actually). OC61 does not have preferred R and I filters but has SR and SI which I would like to be used instead (B, V, SR, SI).

All data would be submitted to AAVSO database after VPhot analysis. I kindly ask TAC for quick decision. I am open to possible changes since it is uncertain how time-consuming this proposal would be in reality.

Krzysztof Zieliński (ZKRA)