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170028512829243436known object
RA 151.387521°Dec +2.7450°b +43.47°l 237.23°
gate v1features v1percentile_composite 1.0.0scored 2026-06-19 03:01 UTC
Anomaly Score
0.8451
moderate tier · 3 scoring columns
Γ red · bottom 2.7% of pool
Driving Signal
Γ red
↓ below pool median
pct 2.727% · col dense_spectral_index
Astrometric Scatter
0.0904″
RA ±0.0409″ · Dec ±0.1212″
100 epochs · 113.8 d baseline
Candidate Depth — Evidence Quality at a Glance
Spectral Index
Γ = −16.5 ± 0.4
2 bands · well-constrained
Epochs
100
adequate
Bands
2
of 6 LSST bands
Gate-Passing
5
moderate tier
Baseline
113.8 d
first–last detection
Primary Band
g
4 epochs
⚠ Negative difference flux in at least one epoch — object was brighter than the survey template at that time. Consistent with a fading transient or pre-existing source in the co-add. Spectral index computed across all detections regardless of flux sign.
Archival Crossmatch — All Four Catalogs
Gaia DR3matched
Stellar positions, parallax, proper motion — 1.5 billion sources
Sep 0.787″
Source ID 3836203284855784192
G mag 16.80
Parallax 5.025 ± 0.078 mas (SNR 64.1)
Class galactic
RUWE 1.05
checked 2026-06-18 02:41 UTC
SIMBADno match
Astronomical object database — named objects and transients
Empty cone — 0 sources within search radius
checked 2026-06-18 02:41 UTC
AllWISEno match
Wide-field infrared survey (3.4–22 μm) — AGN, galaxies, dusty stars
Empty cone — 0 sources within search radius
checked 2026-06-18 02:41 UTC
TNSnot queried
Transient Name Server — reported astronomical transients
Not queried — no TNS API credentials configured
checked 2026-06-18 02:42 UTC
Gaia DR3 source 3836203284855784192, parallax_snr=64.1 > 3σ
Galactic Context
Galactic Latitude
b = +43.47°
Mid/high latitude — lower galactic foreground
Gaia Parallax / Proper Motion
See Gaia match above — parallax and proper motion available.
Gaia Variable Flag
not flagged
No Gaia variability flag in detection metadata
Verdict b = +43.5° places this object at mid-galactic latitude, toward galactic longitude l = 237.2°. Gaia parallax/proper motion can be used to assess galactic membership directly. Empty AllWISE cone argues against a dust-embedded galactic counterpart.
Light Curve — Flux vs Time
5 gate-passing95 excluded (hollow)g, r, z bandsgate v1flux in nJy · zero = survey template level
Points with ±1σ error bars. No fit or interpolation drawn — 5 detections in 3 bands is insufficient for a defensible curve.
What Would Resolve This Candidate
  1. 1
    Optical spectrum

    An optical spectrum would reveal redshift directly (if extragalactic) or stellar spectral type (if galactic). The current driving feature Γ = −16.5 ± 0.4 (3% relative error) is a photometric proxy — a spectrum is the direct measurement.

  2. 2
    More multi-band epochs

    Currently 100 detections in 2 bands over 113.8 days. Color indices g−r, r−i, i−z, z−y are unmeasured — insufficient epochs in one or both component bands. Additional detections spanning those gaps would constrain spectral shape and reduce reliance on the single measured index.

  3. 3
    Sub-arcsecond host imaging

    A deep image in the primary band (g) at sub-arcsecond resolution would determine whether a faint host galaxy underlies the transient position — a distinction Rubin difference frames at their current depth cannot make.

  4. 4
    Template epoch check

    Negative difference flux implies the source was brighter when the survey template co-add was constructed. Inspecting the co-add at this position would confirm whether the source pre-dates LSST coverage, which would strongly favour a persistent extragalactic nucleus over a new transient.

Show Your Work — Provenance & Verification

Control-Set Verification

Before trusting any "no match" result, the crossmatch infrastructure was validated against three controls: (1) a bright Gaia star — returned a clean Gaia DR3 match with correct separation; (2) a known AGN from SIMBAD — matched with the correct object type; (3) a blank sky patch — all four catalogs returned empty cones, confirming the code does not fabricate matches on empty fields. Only after all three controls passed were any "no match" verdicts trusted.

Noise-Aware Anomaly Scoring

Scores use a percentile_composite scorer (v1.0.0). Each feature column is ranked within its tier — sparse objects are compared only to other sparse-tier objects, so a 4-epoch candidate is not penalised against a 200-epoch one. The IsolationForest threshold is calibrated to the 99th percentile of the tier distribution.

This object sits in the moderate tier with 3 scoring columns. Its anomaly score of 0.8451 means it landed in the bottom 2.7% of its tier on the driving feature.

Detection Reliability

Fink real/bogus classifier: mean 0.554, min 0.135. Minimum reliability is close to the 0.5 decision boundary — at least one detection may be borderline. Inspect image stamps before reporting.

Pipeline Versions

Feature set v1 · gate v1 · model percentile_composite 1.0.0 · classified 2026-06-19 02:37 UTC.

Score Run

Run ID: 0446da9b-077c-4b88-a253-7acc335d4e0d