|Proposer||(31841) Frederick Walter (email@example.com) obscode: WFM|
|Assigned To||(3663) Dirk Terrell|
|Date Submitted||Feb. 12, 2021|
Optical Photometry in support of HST/Odysseus observations. II. Monitoring TW Hya
The first phase of the Odysseus campaign was a resounding success. HST obtained UV spectra of 13 low mass pre-main sequence stars in the Orion OB1b star formation region simultaneous with TESS observations. Through program P159, I obtained high quality BVRI and BRri data which will be used to study the color variations and seek correlations with the brightness changes seen in the TESS light curves (the TESS data just became public last week). Data are reported at
Part 2 of the program starts next month. The HST will monitor the 10 million year old K7 pre-main sequence star TW Hya intensively, with 12 observations spread over about 13 days, again simultaneously with TESS observations. TESS observes nearly continuously for 27 days with a 10 minute cadence. The data, both in terms of length of coverage and data quality, cannot be matched from the ground, but TESS is a single channel photometer operating in the red. We need ground-based optical photometry to put the TESS magnitudes in context.
TW Hya is at 11:01:51.9 -34:42:17.0. It is fairly bright, with a mean V ~ 11, and a historical range from 10.6 to 11.3 (VSX).
It is a southern target, which limits the number of AAVSO sites.
Each target should be observed in 4 bands (B,V and either Cousins RI or Sloan ri.)
When I learn exactly when the HST observations will be scheduled, I will provide that information if it is possible to schedule time simultaneous with the HST
|Target||RA (H.HH)||Dec (D.DD)||Magnitude||Telescope||Observation Frequency||Expiration Date||Proprietary Term|
|TW Hya||11.031086||-34.70473||11.3–10.6||OC61||—||Aug. 12, 2021||No|
|BP Tau||4.321072||29.10756||10.0–12.0||OC61||—||June 5, 2023||No|
Committed to OC61
Committed to Berry
Committed to S
BP Tau added
Is Fred also asking for GM Aur data, since both stars are part of Alert Notice 801? Or is the window too far gone?
Comments on this proposal are closed.