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170028520429322331known objectloose-astrometry
RA 149.711789°Dec +2.4216°b +41.91°l 236.27°
gate v1features v1percentile_composite 1.0.0scored 2026-06-19 03:01 UTC
Anomaly Score
0.8017
sparse tier · 1 scoring column
Γ blue · bottom 87.1% of pool
Driving Signal
Γ blue
↑ above pool median
pct 87.069% · col dense_spectral_index
Astrometric Scatter
0.3212″
RA ±0.2980″ · Dec ±0.3429″
7 epochs · 112.8 d baseline
Candidate Depth — Evidence Quality at a Glance
Spectral Index
Γ = +10.1 ± 1.7
17% relative error — high uncertainty
Epochs
7
thin — inspect stamps
Bands
2
of 6 LSST bands
Gate-Passing
4
sparse tier
Baseline
112.8 d
first–last detection
Primary Band
g
2 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 0.552″
Source ID 3836305642516708992
G mag 18.40
Parallax 3.081 ± 0.276 mas (SNR 11.2)
Class galactic
RUWE 0.97
checked 2026-06-18 02:45 UTC
SIMBADmatched
Astronomical object database — named objects and transients
Sep 1.495″
ID 2MASS J09585077+0225189
Type PM* — PM*
checked 2026-06-18 02:45 UTC
AllWISEmatched
Wide-field infrared survey (3.4–22 μm) — AGN, galaxies, dusty stars
Sep 0.937″
Designation J095850.79+022518.5
W1 14.77 W2 14.60
W1−W2 0.17
checked 2026-06-18 02:45 UTC
TNSnot queried
Transient Name Server — reported astronomical transients
Not queried — no TNS API credentials configured
checked 2026-06-18 02:45 UTC
SIMBAD: 2MASS J09585077+0225189
Galactic Context
Galactic Latitude
b = +41.91°
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 = +41.9° places this object at mid-galactic latitude, toward galactic longitude l = 236.3°. Gaia parallax/proper motion can be used to assess galactic membership directly.
Light Curve — Flux vs Time
4 gate-passing3 excluded (hollow)g, r 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 = +10.1 ± 1.7 (17% relative error) is a photometric proxy — a spectrum is the direct measurement.

  2. 2
    More multi-band epochs

    Currently 7 detections in 2 bands over 112.8 days. Color indices 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 sparse tier with 1 scoring column. Its anomaly score of 0.8017 means it landed in the bottom 87.1% of its tier on the driving feature.

Detection Reliability

Fink real/bogus classifier: mean 0.412, min 0.181. 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