Observing Plan
EMERALD+DIVER keeps the original EMERALD observing strategy and adds the DIVER UV-focused plan. Both programs are coordinated around GOODS-N high-redshift targets.
EMERALD (GO-7935) Specific Configuration
- Instrument: NIRSpec MOS
- Spectral mode: G395M/F290LP (2.8-5.1 um)
- Field: GOODS-N
- Target sample: 842 galaxies at z~4-9
- MSA configurations: 6
- Readout: NRSIRS2
- Nodding: 3-shutter dithering
- Per-pointing integration setup: 5 exposures x 16 groups
- On-source time per mask: about 4.9 hours
- Total on-source time (6 masks): about 29.4 hours
EMERALD Pointing Footprints
Footprint visualization of EMERALD pointings in GOODS-N.
DIVER (GO-8018) Specific Configuration
- Instrument: NIRSpec MOS
- Field: GOODS-N
- Target sample: more than 140 galaxies at z~5-9
- Readout: NRSIRS2
- Nodding: 3-shutter nodding
Mode A: G140M/F070LP
- Configurations: 2 masks
- Setup: 21 groups x 2 integrations per exposure x 8 exposures per mask
- On-source time per mask: about 20.6 hours
- Total on-source time: 41.2 hours
Mode B: PRISM/CLEAR
- Configurations: 5 masks
- Setup: 19 groups x 2 integrations
- On-source time per mask: 8403.2 s (about 2.33 hours)
- Total on-source time: 11.7 hours
DIVER Pointing Footprints
Footprint visualization of DIVER pointings in GOODS-N.
Targeting Philosophy
Joint strategy: Prioritize targets with bright rest-frame optical emission, or with indications of UV emission lines.EMERALD
- Prioritize sources with robust prior redshift constraints from existing deep imaging/spectroscopic resources.
- Maintain broad coverage in galaxy properties to reduce demographic bias in AGN-fraction estimates.
- Coordinate with legacy GOODS-N datasets to enable rapid interpretation and follow-up science.
DIVER
- Prioritize known AGNs, UV emitters from literature and the JADES NIRSpec database, bright high-z sources, and high-EW O3 or Halpha emitters from grism surveys.
Current Observation and Visit Status
Auto-fetched from STScI visit status pages (our site re-fetches every 24 hours; STScI updates reports on their own schedule).
GO-7935 STScI report: Sun May 10 06:00:37 EDT 2026 | GO-8018 STScI report: Sun May 10 06:00:37 EDT 2026
Last fetched by our site: Sun, 10 May 2026 10:00:37 GMT
GO-7935 (EMERALD)
| Observation | Visit | Status | Hours | Plan Window |
|---|---|---|---|---|
| 1 | 1 | Archived | 6.06 | Mar 29, 2026 16:54:56 - Mar 29, 2026 23:02:57 |
| 2 | 1 | Archived | 6.67 | Mar 25, 2026 11:29:28 - Mar 25, 2026 17:12:56 |
| 3 | 1 | Archived | 6.04 | Mar 25, 2026 17:13:00 - Mar 25, 2026 22:26:54 |
| 4 | 1 | Flight Ready | 6.06 | Mar 24, 2027 - Apr 3, 2027 (2027.083 - 2027.093) |
| 5 | 1 | Flight Ready | 6.17 | Mar 24, 2027 - Apr 3, 2027 (2027.083 - 2027.093) |
| 6 | 1 | Flight Ready | 6.34 | Mar 24, 2027 - Apr 3, 2027 (2027.083 - 2027.093) |
GO-8018 (DIVER)
| Observation | Visit | Status | Hours | Timing / Plan Window |
|---|---|---|---|---|
| 1 | 1 | Archived | 25.93 | Feb 24, 2026 00:20:03 - Feb 24, 2026 22:57:50 |
| 1 | 2 | Archived | 25.34 | Feb 24, 2026 23:22:34 - Feb 25, 2026 21:20:04 |
| 2 | 1 | Archived | 3.83 | Dec 26, 2025 10:25:58 - Dec 26, 2025 13:42:47 |
| 2 | 2 | Archived | 4.42 | Dec 26, 2025 06:39:20 - Dec 26, 2025 10:25:53 |
| 3 | 1 | Archived | 4.42 | Apr 6, 2026 18:37:51 - Apr 6, 2026 23:07:14 |
| 3 | 2 | Archived | 3.83 | Apr 7, 2026 07:32:43 - Apr 7, 2026 11:22:21 |
| 3 | 3 | Archived | 3.82 | Apr 7, 2026 12:58:59 - Apr 7, 2026 17:07:12 |
Public Program References
GO-7935:
STScI Program Page | Public PDF
GO-8018:
STScI Program Page | Public PDF