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Habitable Worlds Observatory

The Habitable Worlds Observatory SIG serves as a forum and focal point for the HWO community.

About HWO SIG

The Search for Earth-Like Planets in Habitable Zones

HWO is a large infrared/optical/ultraviolet space telescope recommended by the National Academies’ Pathways to Discovery in Astronomy and Astrophysics for the 2020s.

HWO will be the first telescope designed specifically to search for signs of life on planets orbiting other stars. With a powerful set of instruments, it will also provide a platform for transformational astrophysics.

Habitable Worlds Observatory about The Search for Earth-Like Planets in Habitable Zones

"Inspired by the vision of searching for signatures of life on planets outside of our solar system, and by the transformative capability such a telescope would have for a wide range of astrophysics, the priority recommendation in the frontier category for space is a large (~6 m diameter) IR/O/UV telescope with high-contrast (10-10) imaging and spectroscopy. This is an ambitious mission, of a scale comparable to the HST and JWST space telescopes. It is also one that will be revolutionary, and that worldwide only NASA is positioned to lead." (Text source: Decadal Survey on Astronomy and Astrophysics 2020 [Astro2020])

Ultraviolet Astrophysics

Ultraviolet wavelengths are important to answer many questions in astrophysics. In addition to being sensitive to optical and near-infrared, Habitable Worlds Observatory will be sensitive to ultraviolet light.

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News & Events

To submit topics for future SIG activities and seminars please use this Google Form!

Habitable Worlds Observatory SIG Seminar, 11 Feb 2026

This seminar will feature an update from the Habitable Worlds Observatory Community Science & Instrument Team (CSIT), presentations on technical capabilities, and time for groups to advertise their HWO-related work and find collaborators. If you would like an advertisement slot…

Feb 4, 2026
Topic
AAS Meeting 247, Jan 2026

The 247th AAS meeting (joint with the Historical Astronomy Division) will be held 4-8 January in Phoenix, Arizona at the Phoenix Convention Center. Join us in the exhibit hall at the NASA booth and attend the NASA sessions.

Jan 4, 2026
Topic
Habitable Worlds Observatory SIG Seminar, 3 Dec 2025

We would like to invite you to our next virtual seminar: Wednesday, December 3rd, at 10:00 am PT / 1:00 pm ET / 6:00 pm BST / 7:00 pm CET. This is an excellent opportunity to stay informed on the…

Dec 3, 2025
Topic
Habitable Worlds Observatory SIG Seminar 8 Oct 2025

Agenda Topic Speaker HWO SIG Welcome Vivian U Update from TMPO Giada Arney SAG Process Karl Stapelfeldt SAG Highlight #1: UV IFU Emily Witt SAG Highlight #2: Exozodi John Debes Walk on Discussion Laura Mayorga Seminar Connection Join the Seminar

Oct 8, 2025
Topic
Habitable Worlds Observatory Science Interest Group (HWO SIG)

“Inspired by the vision of searching for signatures of life on planets outside of our solar system, and by the transformative capability such a telescope would have for a wide range of astrophysics, the priority recommendation in the frontier category…

Sep 9, 2025
Topic
Habitable Worlds Observatory Science Call

Dear Colleagues, We’re thrilled to share draft science cases that will help shape the top-level science goals, instrument needs, and mission architecture for the Habitable Worlds Observatory (HWO) — NASA’s next flagship mission in formulation for astrophysics, as recommended by…

Jun 3, 2025
Topic

HWO SIG Chairs

NameInstitutionPAG Affiliation
Jessie ChristiansenIPAC/NExScIExoplanet Exploration
Laura Mayorga JHU/APLExoplanet Exploration
Joe Burchett New Mexico State UniversityCosmic Origins
Vivian UIPACCosmic Origins
Richard MasseyDurham UniversityPhysics of the Cosmos
Fabio PacucciHarvardPhysics of the Cosmos

GroupPAGContactsGroup Type
OVI in Diffuse Media COPAGSanch BorthakurOther
Spatially Resolved UV Spectroscopy Science Analysis Group in Support of Habitable Worlds ObservatoryCOPAGEmily WittSAG
Exoplanet DemographicsExoPAGRachel Fernandes,
Kiersten Boley
SIG
Exoplanet/Solar System SynergiesExoPAGVikki Meadows,
Kathy Mandt 
SIG
Exoplanet Reflectance Spectroscopy for the Habitable Worlds ObservatoryExoPAGRenyu Hu,
Ty Robinson
SAG
Exploring the Complementary Science Value of Starshade ObservationsExoPAGSara Seager,
Stuart Shaklan
SAG
The Impact of Exo-Zodiacal Dust on Exoplanet Direct Imaging SurveysExoPAGJohn Debes,
Yasuhiro Hasegawa
SAG
HWO Red Wavelength LimitCOPAGRoberta Paladini.
Kyle Cook,
Benne Holwerda
SAG
Exploring Galaxies Throughout the Universe(HWO section of seminar series)COPAGAaron YungSIG
Planetary Defense with HWON/AAndy RivkinOther

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