Rocky Worlds : Targets

Rocky Worlds DDT: Targets

Introduction

To date, the Rocky Worlds DDT program has selected four targets to perform observations: GJ 3929 b, LTT 1445 A c, LTT 1445 A b, and LHS 1140 b. JWST observations are expected to be performed to obtain secondary eclipse measurements with 15 μm photometry, while HST/UV observations are expected to be obtained to form a panchromatic spectrum of the host stars, as well as to monitor possible stellar flares.

Future possible targets, expected to be selected no later than September 2025, will be drawn from the Targets Under Consideration (TUC), a list that compiles possible targets that are relevant to the DDT program. This TUC list has been curated thanks to contributions from the community, the Core Implementation Team (CIT) at STScI and the Rocky World’s DDT Scientific Advisory Committee (SAC). These very same contributions will be used to define the next set of targets to be observed by the DDT.

The TUC plot and table

Below is a plot of 80 targets that are being considered for observation by the Rocky Worlds DDT. The plot and table are interactive. Here are some instructions on using the Bokeh plot. You may also highlight targets on the table to see their location in the plot.

Download the complete TUC table
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Tap an individual target
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The interactive plot is only available in a wider screen

Planet Earth and the Moon as seen by NASA's Voyager 1 on September 18, 1977.

Parent Star	Planet	Radius (R⊕)	Mass (M⊕)	Period (Days)	Kmag	Teff (K)	a/R★	RP /R★	Teq (K)	Priority Metric^η
LTT 1445 A	LTT 1445 A c^Ψ	1.10	1.37	3.12	6.5	3340	21.1	0.036	514	-0.2283
Stellar Parameters Name LTT 1445 A RA 03 01 51.4 hms DEC −16 35 36.0 ° ′ ″ Radius 0.271 R_☉ Mass 0.257 M_☉ Exoplanet Parameters Name LTT 1445 A c Teq 514 K Period 3.12 days Radius 1.10 R_⊕ Mass 1.37 M_⊕ useful links
GJ 3929	GJ 3929 b^Ψ	1.09	1.21	2.62	7.9	3384	16.8	0.033	584	-0.2937
Stellar Parameters Name GJ 3929 RA 15 58 18.8 hms DEC +35 24 24.3 ° ′ ″ Radius 0.32 R_☉ Mass 0.313 M_☉ Exoplanet Parameters Name GJ 3929 b Teq 584 K Period 2.62 days Radius 1.09 R_⊕ Mass 1.21 M_⊕ useful links
LHS 1140	LHS 1140 b	1.73	5.6	24.74	8.8	2988	94.2	0.073	218	0.0762
Stellar Parameters Name LHS 1140 RA 00 44 59.3 hms DEC -15 16 17.5 ° ′ ″ Radius 0.22 R_☉ Mass 0.18 M_☉ Exoplanet Parameters Name LHS 1140 b Teq 218 K Period 24.74 days Radius 1.73 R_⊕ Mass 24.74 M_⊕ useful links
LTT 1445 A	LTT 1445 A b	1.32	2.73	5.36	6.5	3340	30.2	0.045	430	-0.0503
Stellar Parameters Name LTT 1445 A RA 03 01 51.4 hms DEC -16 35 36.0 ° ′ ″ Radius 0.271 R_☉ Mass 0.257 M_☉ Exoplanet Parameters Name LTT 1445 A b Teq 430 K Period 5.36 days Radius 1.32 R_⊕ Mass 2.73 M_⊕ useful links

Ψ : Target already in at least one JWST program; observing mode(s) may or may not include emission photometry at 15 μm.
η : The Priority Metric calculated here is used to provide an initial ranking to each target in the TUC.

Date	Changes
June 17, 2025	Two new exoplanets selected for observation : LHS 1140b and LTT 1445Ab
April 10, 2025	Rocky Worlds DDT website goes live
March 14, 2025	Webpage created

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