399P
399P/PANSTARRS
Not currently visible. Last report 1780 days ago at mag 24.0. Historic peak was mag 18.1. 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
24.0
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
6
Arc unknown
Last observation
1780d ago
Tue, 02 Nov 2021 01:26:24 GMT · COBS consensus
Perihelion
2028-10-13
2.100 au
Peak window
2028-10-10 → 2028-10-16
COBS peak mag 18.1 on 2028-10-13 · perihelion 2028-10-13. Window is those dates ±3 days — not a light-curve fit.
Historic peak
18.1
COBS / analyzed peak 2028-10-13
Catalog ingest
11h ago
Venator last wrote this row 2026-09-16 13:20:19 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
2.100 au
e
0.4470
i
13.30°
Ω
207.00°
ω
214.00°
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
399P/PANSTARRS
399P · 2026-09-14 18:28:00 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:28:00 UTC → current
Contributors
CCD Observer · HIL04 · 6 reports · last 4647d ago
CCD Observer · PRY01 · 2 reports · last 4721d ago
CCD Observer · PAP04 · 1 reports · last 1780d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.