JWST Galactic Center HiPS

Four mosaics preloaded over MeerKAT 1284 MHz, plus star-subtracted MIRI variants and the MIRI mosaic without the 4QPM fields. Check a layer to show it; set its opacity from the layers button at the top left of the map.

Base survey

MeerKAT 1284 MHz Stokes I (Heywood et al. 2022) is the default base, by request. It covers roughly 6°×3° around the Galactic Center and goes blank outside that, so switch to VVV DR4 H or 2MASS when panning away from the center.

JWST layers
ALMA / radio layers10
ALMA cubes17
Maps made from the ACES (ALMA CMZ Exploration Survey) 3 mm line cubes: one line and one product at a time. Pick a line and a product; the map swaps in place while the box is checked. Peak is the maximum over velocity; moment 0 is the integrated intensity inside a dilated signal mask; the masked peaks take the maximum inside a signal mask. Lines with fewer products list only the ones that exist.
Catalog overlays14
F212N−F480M > 4 (AB): 779 sources across 20 fields, matched at 0.1". Click one for its color, observation, and provenance. 299 come from eight fields cataloged in NIRCam module A only — half a tile each, and with no vetting pass on the F480M side, so an extreme color there can still be a cross-filter mismatch rather than an embedded star.
655 sources, B3 + B6. Ginsburg+2018 / Budaiev+2024; sources with a Ginsburg+2018 identifier carry it.
816 dendrogram leaves, Hatchfield+ CMZoom continuum.
1735 compact continuum sources, Wallace+2026 (v0).
5376 IFU positions across 6 pointings and 55 OBs, graded A/B/C. One marker per arm, not per pointing: each is where a single KMOS IFU sat. Click one for its pointing, OB, arm, and grade.
The 58 stars FGS was pointed at, read from the guide-star exposures themselves, labeled with the observation each was chosen for. Click for the GSC 2.3 id, FGS magnitude, ID order, catalog position uncertainty, and outcome. 15 were reached only after an earlier candidate failed.
In red: the 11 stars chosen for the 7 visits that never reached fine guide — which is why those seven fields are missing. Click one for the rung the ladder stopped at: identification (o099, o103, o115, o119), acquisition (o104, o110), or track (o136, which held the star and then lost it). Read from the FGS guide-star exposures, which exist for every visit that was attempted whether or not any science data followed.
The 7 pointings the survey is missing, at their planned position. Each has guide stars in the red layer above; none of them produced science data.
Flystar 2-epoch fit, same filter (F212N) both epochs: JWST program 5365 (2024-09-07) against GC Treasury program 10678 (~2026-09-12), ∼2.0 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility.
Flystar 2-epoch fit, same filter (F480M) both epochs: JWST program 2092 (2023-03-20) against GC Treasury program 10678 (2026-09-13), ∼3.5 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility.
Flystar 2-epoch fit, same filter (F212N) both epochs: Arches' own JWST catalog (epoch 2023.63) against GC Treasury program 10678 (~2026-09-13), ∼3.1 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility. Treasury reference: see jwst-gc-pipeline#958 caveat above.
Flystar 2-epoch fit, same filter (F212N) both epochs: Quintuplet's own JWST catalog (epoch 2024.61) against GC Treasury program 10678 (~2026-09-13), ∼2.1 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility. Treasury reference: see jwst-gc-pipeline#958 caveat above.
Flystar 2-epoch fit, same filter (F212N) both epochs: Brick's own JWST catalog (epoch 2022.65) against GC Treasury program 10678 (~2026-09-13), ∼4.0 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility. Treasury reference: see jwst-gc-pipeline#958 caveat above.
Flystar 2-epoch fit, same filter (F212N) both epochs: Cloud c's own JWST catalog (epoch 2023.28) against GC Treasury program 10678 (~2026-09-13), ∼3.4 yr baseline. Click a point for pm_ra/pm_dec (mas/yr). Arrows in the layer below show the same fit scaled up for visibility. Treasury reference: see jwst-gc-pipeline#958 caveat above.
Star overlays10

Maps made from the GC Treasury (10678) F212N and F480M star catalogs. All off by default. The density maps are in stars/arcmin2 on a 2" grid smoothed by a Gaussian of σ = 6", and count saturated stars once each. In the 2026-10-04 overlay build, F212N and F480M agree to within 22 mas in every field, well inside the 0.1″ match tolerance. o063 and o113, formerly 0.22–0.27″ apart (jwst-gc-pipeline#921), were fixed by reprocessing and have been in the color layers since that build.

3.3 million stars as a progressive catalog: only the tiles in view are fetched, and more stars appear as you zoom in. Brightest F212N stars load first. Click a star for its F212N and F480M magnitudes, color (AB), saturation flag, and observation.
Proper motion vectors6
Same fit as the catalog overlay above, drawn as vectors. True JWST-JWST displacement over the ∼2.0 yr baseline is a few mas at most, so arrow length is amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn.
Same fit as the catalog overlay above, drawn as vectors, amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn. GC Treasury's F480M coverage over this small footprint is still nrca/nrcb-separate, m2-stage (pre-merge, pre-vetting at the full-mosaic level) -- fewer, but real, trustworthy stars than Sgr B2's deeper m7 catalog.
Same fit as the catalog overlay above, drawn as vectors, amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn.
Same fit as the catalog overlay above, drawn as vectors, amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn.
Same fit as the catalog overlay above, drawn as vectors, amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn.
Same fit as the catalog overlay above, drawn as vectors, amplified 200× to be visible -- read direction and relative length, not absolute scale, off the plot. Only trustworthy fits (isolated, dominant match, err <3 mas/yr) are drawn.
JWST focal plane5
The whole observatory at one pointing's own attitude: NIRCam's eight SW detectors and two LW, MIRI's imager, both FGS guiders, and NIRISS, at that observation's PA_V3. Every aperture is projected through a single attitude anchored on NRCALL_FULL — the aperture APT points at — which is what puts the parallels where they were rather than on top of the prime.
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Treasury astrometry. The GC Treasury layers (program 10678) are built from mosaics tied to VIRAC2 per pointing and per band, with per-exposure corrections from the visit consensus. F212N and F480M are tied separately, so a pointing's two bands can differ by a few mas. In some pointings the latest reference tie was refused and the previous accepted one is kept, which can leave a residual of tens of mas (jwst-gc-pipeline#957).