311P
311P/PANSTARRS
Not visible to typical instruments. Current estimate mag 21.9. Visual and most CCD amateur setups will not see it. Space telescopes or large ground telescopes are the remaining path.
Right ascension
—
J2000
Declination
—
J2000
Estimated magnitude
21.9
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
4
Arc unknown
Last observation
24d ago
Mon, 24 Aug 2026 05:01:00 GMT · COBS consensus
Perihelion
2027-03-29
1.940 au
Peak window
2023-11-04 → 2027-04-01
COBS peak mag 21.3 on 2023-11-07 · perihelion 2027-03-29. Window is those dates ±3 days — not a light-curve fit.
Historic peak
21.3
COBS / analyzed peak 2023-11-07
Catalog ingest
11m ago
Venator last wrote this row 2026-09-17 01:55:25 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
1.940 au
e
0.1150
i
4.97°
Ω
279.00°
ω
144.00°
a
—
MOID
—
H
—
H0 / n
—
NEO score
—
PHA score
—
RMS
—
Elongation
—
Reporting sources
COBS comet list
downComet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).
Name history
311P/PANSTARRS
311P · 2026-09-14 18:27:56 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:56 UTC → current
Contributors
CCD Observer · PAP04 · 2 reports · last 1058d ago
CCD Observer · MAI01 · 2 reports · last 24d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.