# LRDW J021756.48-051007.4 — Cerin Amroth

Source: https://cerinamroth.com/jwst/lrds/dr1/j021756.48-051007.4/

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LRD Watch DR1 · candidate

 

# LRDW J021756.48-051007.4

 

candidate tableSILVERmain classcolour laneUDS (PRIMER UDS-2)

 

 

 

RA 02:17:56.482 34.4853397°

 

Dec −05:10:07.45 -5.1687348°

 

[SIMBAD within 2″](https://simbad.cds.unistra.fr/simbad/sim-coo?Coord=34.485340+-5.168735&Radius=2&Radius.unit=arcsec) · [ESASky](https://sky.esa.int/esasky/?target=34.485340%20-5.168735&fov=0.02&sci=true)

 

  

 

## Images

 

 F090W image, 3.2 arcsec across, north up 

F090W0.03″ px

 F115W image, 3.2 arcsec across, north up 

F115W0.03″ px

 F150W image, 3.2 arcsec across, north up 

F150W0.03″ px

 F200W image, 3.2 arcsec across, north up 

F200W0.03″ px

 F277W image, 3.2 arcsec across, north up 

F277W0.06″ px

 F356W image, 3.2 arcsec across, north up 

F356W0.06″ px

 F410M image, 3.2 arcsec across, north up 

F410M0.06″ px

 F444W image, 3.2 arcsec across, north up 

F444W0.06″ px

 Colour composite: F444W red, F356W green, F277W blue, 3.2 arcsec across, north up NE

compositebar 1″

 

3.2″ across, north up, east left, resampled from the deepest mosaic covering the object in each band; ticks mark the catalogue position. Each band is stretched on its own noise; the composite shares one flux scale, so its colour is real.

 

 

 

  

## Spectral energy distribution

  
- NIRCam wide
- NIRCam medium
- 2σ upper limit (S/N < 2)

 Aperture fluxes in a 0.16″-radius circle, not corrected to total; the values are in the photometry table below. The gold line marks the Balmer limit (3646 Å rest) at z = 8.299.  

 

## At a glance

 

TierSILVER main class

Found bycolour lane

Redshift8.30 photometric

Spectral shapeno labelled spectrum

F444W27.55 AB S/N 11, 0.16″ aperture

F277W − F444W1.39 mag strict redness

BH* sharenot in the BH* channel

CompactnessFWHM 0.259″

Balmer break2.00 ± 0.69 F410M/F277W, clean

Image vettinghalf-stack pass; no flags raised

Literatureno published match within 1″

 

 

 

 

 

## Vetting

 
- Image vettingpassed
- Half-stack testpass
- Artifact risknone
- Neighbournone
- Extendedno

 
- No vetting notes.

 

 

 

## Redshifts

 

Each redshift keeps its own column. Photometric redshifts of little red dots are unreliable: against spectra, about a third of AGN-template redshifts (`z_agn`; 31 of 95 in the last purity run) and about half of galaxy-template redshifts at z > 3 were catastrophic outliers (methods Section 8).

 

 | Column | What it is | z | Source
 | `z_spec` | Spectroscopic, DJA grade 3 | — | —
 | `z_vet` | Adopted by vetting | 8.2990 | pz:z_map
 | `z_phot` | Photometric (P(z) peak) | 8.299 | 68%: 7.612–9.043
 | `z_bhs` | BH* channel fit | — | —
 | `z_agn` | Colour-lane fit | 8.12 | AGN-inclusive templates

 

 

 

 

 

## Spectral checks

 

V-shape (spectrum)no labelled spectrum

Star (spectrum)no spectrum

V-shape (photometry)passes βUV −2.71, βopt 5.64 at z_agn

Line in F410Mnone 1 line-free optical band(s)

Line-ambiguousno

Settling verdictnot evaluated

 

 

 

## Literature

 

Published objects within 1″ of this position. A match is a positional recovery, not an adopted classification.

 
- No published JWST little red dot or broad-line AGN within 1″.

 

 

 

 

 

## Photometry

 

Circular aperture of radius 0.16″ at each band's native resolution, background from a 0.40–0.65″ annulus, programmes combined by inverse variance. For a point source multiply by the field's aperture correction (r = 0.16″ → 0.70″). Grey rows are below S/N 2.

 

 | Band | Instrument | Pivot (µm) | f (nJy) | σ (nJy) | AB mag | S/N | Ap. corr.
 | F090W | NIRCam wide | 0.902 | −4.87 | 7.02 | — | −0.7 | 1.15
 | F115W | NIRCam wide | 1.154 | 9.95 | 6.50 | 28.91 | 1.5 | 1.12
 | F150W | NIRCam wide | 1.501 | 21.09 | 5.18 | 28.09 | 4.1 | 1.11
 | F200W | NIRCam wide | 1.989 | 17.28 | 4.46 | 28.31 | 3.9 | 1.09
 | F277W | NIRCam wide | 2.762 | 9.61 | 2.44 | 28.94 | 3.9 | 1.20
 | F356W | NIRCam wide | 3.568 | 16.79 | 2.34 | 28.34 | 7.2 | 1.23
 | F410M | NIRCam medium | 4.082 | 19.15 | 4.48 | 28.20 | 4.3 | 1.26
 | F444W | NIRCam wide | 4.404 | 34.57 | 3.14 | 27.55 | 11.0 | 1.27

 

 

 

## Provenance

 

 FieldUDS (PRIMER UDS-2) (`primeruds2`) Programmes`01837, 07814` behind every mosaic the field measured Pipeline rows merged2 all at one position Detection passoriginal Release build`33af9933d1cc` 2026-10-17T14:29:44Z 

 

## Image sources

 | Band | Mosaic | Native pixel | Coverage
 | F090W | `jw01837-c1001_t000_nircam_clear-f090w_i2d.fits` | 0.031″ | 1.00
 | F115W | `jw01837-c1001_t000_nircam_clear-f115w_i2d.fits` | 0.031″ | 1.00
 | F150W | `jw01837-c1001_t000_nircam_clear-f150w_i2d.fits` | 0.031″ | 1.00
 | F200W | `jw01837-c1001_t000_nircam_clear-f200w_i2d.fits` | 0.031″ | 1.00
 | F277W | `jw01837-c1001_t000_nircam_clear-f277w_i2d.fits` | 0.063″ | 1.00
 | F356W | `jw01837-c1001_t000_nircam_clear-f356w_i2d.fits` | 0.063″ | 1.00
 | F410M | `jw01837-c1001_t000_nircam_clear-f410m_i2d.fits` | 0.063″ | 1.00
 | F444W | `jw01837-c1001_t000_nircam_clear-f444w_i2d.fits` | 0.063″ | 1.00

 

 

 

## Cite

 

Anderson, Jordan (2026). LRD Watch DR1: little red dot candidates from an independent search of public JWST imaging (Version DR1) [Data set]. Cerin Amroth Research. Zenodo. https://doi.org/10.5281/zenodo.23062632 Object LRDW J021756.48-051007.4.

 

CC BY 4.0. Please also acknowledge the JWST programmes that took the data. LRD Watch DR1 is a vetted candidate catalogue, not a complete census: it has no selection function and cannot on its own give number densities. [About the release](https://cerinamroth.com/jwst/lrds/dr1/).

 

 [← LRDW J021756.06-051008.1](https://cerinamroth.com/jwst/lrds/dr1/j021756.06-051008.1/)[LRDW J021757.39-052135.8 →](https://cerinamroth.com/jwst/lrds/dr1/j021757.39-052135.8/)