Proposal #474
| Proposer | (38172) Ari M. Siqueira (ari.m.siqueira@icloud.com) obscode: SAMA |
|---|---|
| Assigned To | (3663) Dirk Terrell |
| Date Submitted | Jan. 4, 2024 |
| Status | Allocated |
| Priority | Normal |
| Proposal | Dear members of the AAVSOnet Telescope Allocation Committee, I submit here a proposal for spectral imaging with the BSM Berry telescope, in connection with Proposal #307. In that proposal, over 600 GR images (SA-200) were taken and these images need additional analyses which will benefit from having spectra taken from at least three of the targets specified below for instrument calibration. I thank you for your attention to this proposal. Yours, Ari Siqueira (SAMA) |
| Target | RA (H.HH) | Dec (D.DD) | Magnitude | Telescope | Observation Frequency | Expiration Date | Proprietary Term |
|---|---|---|---|---|---|---|---|
| 4 Sgr | 17.996543 | -23.81611 | 4.72 | BSM_Berry | — | July 16, 2024 | No |
| ksi02 CMa | 6.584274 | -22.96480 | 4.5 | BSM_Berry | — | July 16, 2024 | No |
| chi Cap | 21.142674 | -21.19367 | 5.28 | BSM_Berry | — | July 16, 2024 | No |
| ksi01 Sgr | 18.955688 | -20.65635 | 5.05 | BSM_Berry | — | July 16, 2024 | No |
| eta Crt | 11.933598 | -17.15082 | 5.16 | BSM_Berry | — | July 16, 2024 | No |
| tet Vir | 13.165830 | -5.53900 | 4.4 | BSM_Berry | — | July 16, 2024 | No |
Comments
- (38172) Ari M. Siqueira — Jan. 4, 2024, 12:56 a.m.
As for the observation frequency, the above targets will require to be imaged only three times each on the same night, for stacking.
Regardless of their brightness, exposure should be on the order of between 10 and 30 seconds for each frame to attain adequate SNR since these will be spectral images, not photometric ones.
Please try to get the best focus on the spectra (first-order diffraction), not the stars (zero-order).
Thank you.- (38172) Ari M. Siqueira — Jan. 8, 2024, 1:25 p.m.
Reviewing my comments above, I would like to ask the following, in case this proposal for the imaging of a few A-type stars is approved:
1. That six 30-sec frames be taken for each target;
2. That the camera and grating be positioned horizontally in the North-South direction so that the apparent star displacement occurs perpendicularly to the dispersion line;
3. That the focus receives the fine adjustment needed to prioritize the spectra rather than the star images.
Thank you.- (38172) Ari M. Siqueira — Jan. 8, 2024, 7:56 p.m.
I am aware that the targets proposed are not variable stars but to have spectra from such objects with the same gear that generated +600 spectral images in a previous proposal (#307) will be extremely useful for a more complete evaluation of the data already collected at BSM Berry, and for my learning goals.
- (3663) Dirk Terrell — Jan. 11, 2024, 4:48 p.m.
The TAC has accepted the proposal. We would like you to check the first set of images for good focus and let Ken know how they look so that we can make adjustments if needed.
- (38172) Ari M. Siqueira — Jan. 11, 2024, 10:02 p.m.
I am aware of Dirk's last message. I will carefully assess the images' focus. Then I shall inform Ken about my impression of their quality.
Thank you all for the acceptance of this proposal.- (4726) Kenneth Menzies — Jan. 18, 2024, 2:21 p.m.
committed to Berry.
Comments on this proposal are closed.