Observations Timeline Deliveries Timeline
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JUNE 2020 - HST massive star observations begin
HST observations of massive stars in the LMC and SMC begin in June 2020. See the Large Magellanic Cloud and Small Magellanic Cloud pages for the most up-to-date HST plan windows.
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JUL 2020 - ULLYSES website launch
The official ULLYSES website is launched. Here you can find scheduling information, target tables, data products, and more. In the future, additional tools will be provided for investigating and downloading ULLYSES data products.
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AUG 2020 - LCOGT pilot program begins
This pilot program is obtaining V and i' band imaging with the Las Cumbres Observatory Global Telescope (LCOGT) network for the 13 T Tauri stars in the Orion OB1 association and the σ Orionis cluster. Observations are taken approximately 90 and 10 days before, during, and 10 and 90 days after HST observations.
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OCT 2020 - NGC3109 WFC3 imaging observations
WFC3 images are being taken of the massive stars in the two low metallicity galaxies, Sextans A (see program 16104. These observations will refine our knowledge of the massive stars' UV flux, allowing for more accurate spectroscopic observations.
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NOV 2020 - Data Release 1
The first release of ULLYSES High Level Science Products (HLSPs). Products includes COS and STIS coadded and abutted spectra. For more information, refer to the Data Release 1 notes.
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NOV 2020 - T Tauri star observations begin
HST observations of 13 T Tauri stars in the Orion OB1 association and the σ Orionis cluster begin in November 2020. Concurrent TESS observations are taken every 30 minutes during HST observations. See the T Tauri target page for the most up-to-date HST plan windows.
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MAR 2021 - Data Release 2
The second release of ULLYSES High Level Science Products (HLSPs). Products include COS, STIS, and FUSE coadded and abutted spectra. For more information, refer to the Data Release 2 notes.
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MAR 2021 - TW Hya epoch 1 observations begin
Four T Tauri monitoring stars (TW Hya, RU Lup, GM Aur, and BP Tau) will each be observed four times per rotation period over three rotation cycles. The first epoch of TW Hya will occur simultaneously with TESS between March 9 and 19 2021.
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AUG 2021 - Data Release 3
The third release of ULLYSES High Level Science Products (HLSPs). Updated HLSPs for previously delivered products include recent pipeline and calibration improvements- any existing HLSPs from previous DRs should be replaced with newly downloaded products. HLSPs are also provided for 6 companion targets present in STIS long-slit observations. DR3 includes two new product types – time-series spectra and WFC3 drizzled images – and introduces LCOGT (Las Cumbres Observatory Global Telescope) data for an initial subset of ULLYSES T Tauri stars. For more information, refer to the Data Release 3 notes.
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DEC 2021 - Data Release 4
The fourth release of ULLYSES High Level Science Products (HLSPs). Updated HLSPs for previously delivered products include recent pipeline and calibration improvements- any existing HLSPs from previous DRs should be replaced with newly downloaded products. Products with the _sed extension have been renamed to _preview-spec. For more information, refer to the Data Release 4 notes.
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JAN 2022 - Second epoch of low mass monitoring stars
A second epoch of observations will be obtained for each of the four T Tauri monitoring stars, occurring 9-12 months after the first epoch. These epochs will again be a set of four observations per rotation period for three rotation cycles.
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JUN 2022 - Data Release 5
The fifth release of ULLYSES High Level Science Products (HLSPs). Updated HLSPs for previously delivered products include recent pipeline and calibration improvements- any existing HLSPs from previous DRs should be replaced with newly downloaded products. The HLSP creation code is now available to the public. For more information, refer to the Data Release 5 notes.
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NOV 2022 - Data Release 5b
Data Release 5b (DR5b) of ULLYSES High Level Science Products (HLSPs). DR5b is a limited release and only consists of high-level science products (HLSPs) for 17 new ULLYSES targets. A new MAST search form that provides ULLYSES data, stellar parameters, and observational information is also now available. For more information, refer to the Data Release 5b notes.
