A/2025 S2
A/2025 S2
Not currently visible. Last report 333 days ago at mag 22.3. Historic peak was mag 17.0. Typical backyard telescopes will not show it. HST, JWST, or an 8–10 m class telescope might recover it with a good ephemeris.
Right ascension
—
J2000
Declination
—
J2000
Estimated magnitude
22.3
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
8
Arc unknown
Last observation
333d ago
Tue, 09 Dec 2025 12:00:00 GMT · COBS consensus
Perihelion
2026-01-02
1.690 au
Peak window
2025-11-05 → 2026-01-05
COBS peak mag 17.0 on 2025-11-08 · perihelion 2026-01-02. Window is those dates ±3 days — not a light-curve fit.
Historic peak
17.0
COBS / analyzed peak 2025-11-08
Catalog ingest
13h ago
Venator last wrote this row 2026-11-06 14:20:25 UTC
Light curve
Brightness over time (V mag)
Gold = reported observations. Steel dashed family = ensemble (nominal / outburst / fade / disruption).
Tail length
Converted to degrees from COBS (d / arcmin / arcsec). Empty until analysis has pulled the archive.
No tail measures stored yet for this object.
Ensemble is a first-pass H0/n photometric model plus observed samples — not a trained ML forecast yet. The background analyzer walks the catalog one object at a time so COBS is not flooded. Disruption track rises after perihelion to stand in for solar-wind stripping.
Orbital elements
q
1.690 au
e
0.9730
i
96.60°
Ω
34.50°
ω
31.60°
a
—
MOID
—
H
—
H0 / n
—
NEO score
—
PHA score
—
RMS
—
Elongation
—
Reporting sources
COBS comet list
okComet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).
Name history
A/2025 S2
A/2025 S2 · 2026-09-14 18:28:02 UTC → current
Discoverers
- No discoverer parsed from the published name yet.
Contributors
CCD Observer · YOS02 · 4 reports · last 333d ago
CCD Observer · SRE01 · 3 reports · last 364d ago
CCD Observer · FRI02 · 1 reports · last 372d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.