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170587115948081620novel candidate
RA 326.471245°Dec −14.2138°b -45.00°l 39.95°
gate v1features v1percentile_composite 1.0.0scored 2026-07-26 03:01 UTC
Anomaly Score
0.7611
sparse tier · 1 scoring column
Γ red · bottom 19.0% of pool
Driving Signal
Γ red
↓ below pool median
pct 19.000% · col dense_spectral_index
Astrometric Scatter
0.0321″
RA ±0.0421″ · Dec ±0.0167″
4 epochs · 15.9 d baseline
Candidate Depth — Evidence Quality at a Glance
Spectral Index
Γ = −14.2 ± 2.2
16% relative error — high uncertainty
Epochs
4
thin — inspect stamps
Bands
2
of 6 LSST bands
Gate-Passing
4
sparse tier
Baseline
15.9 d
first–last detection
Primary Band
i
3 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 DR3no match
Stellar positions, parallax, proper motion — 1.5 billion sources
Empty cone — 0 sources within search radius
checked 2026-07-14 03:10 UTC
SIMBADno match
Astronomical object database — named objects and transients
Empty cone — 0 sources within search radius
checked 2026-07-14 03:10 UTC
AllWISEno match
Wide-field infrared survey (3.4–22 μm) — AGN, galaxies, dusty stars
Empty cone — 0 sources within search radius
checked 2026-07-14 03:10 UTC
TNSnot queried
Transient Name Server — reported astronomical transients
Not queried — no TNS API credentials configured
checked 2026-07-14 03:10 UTC
No counterpart in Gaia DR3, SIMBAD, AllWISE, or TNS (TNS skipped — no credentials)
Galactic Context
Galactic Latitude
b = -45.00°
Mid/high latitude — lower galactic foreground
Gaia Parallax / Proper Motion
No Gaia source in cone. Parallax and proper motion unavailable — galactic membership cannot be settled by kinematics alone.
Gaia Variable Flag
not flagged
No Gaia variability flag in detection metadata
Verdict b = -45.0° places this object at mid-galactic latitude, toward galactic longitude l = 39.9°. No Gaia counterpart means galactic membership cannot be resolved by kinematics — a spectrum or additional astrometric epochs are needed. Empty AllWISE cone argues against a dust-embedded galactic counterpart.
Light Curve — Flux vs Time
4 gate-passingr, i bandsgate v1flux in nJy · zero = survey template level
Points with ±1σ error bars. No fit or interpolation drawn — 4 detections in 2 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 = −14.2 ± 2.2 (16% relative error) is a photometric proxy — a spectrum is the direct measurement.

  2. 2
    More multi-band epochs

    Currently 4 detections in 2 bands over 15.9 days. Color indices g−r, 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 (i) 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 sparse tier with 1 scoring column. Its anomaly score of 0.7611 means it landed in the bottom 19.0% of its tier on the driving feature.

Detection Reliability

Fink real/bogus classifier: mean 0.689, min 0.616. All detections are above the 0.6 reliability threshold.

Pipeline Versions

Feature set v1 · gate v1 · model percentile_composite 1.0.0 · classified 2026-07-14 03:11 UTC.

Score Run

Run ID: d87ebea4-f00e-4ebc-938f-714a13eadbb8

Object 170587115948081620 — Rubin Anomaly Platform