378P
378P/McNaught
Not currently visible. Last report 1457 days ago at mag 26.2. Historic peak was mag 19.3. 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
26.2
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
6
Arc unknown
Last observation
1457d ago
Wed, 21 Sep 2022 05:07:00 GMT · COBS consensus
Perihelion
2020-10-02
3.380 au
Peak window
2020-06-25 → 2020-10-05
COBS peak mag 19.3 on 2020-06-28 · perihelion 2020-10-02. Window is those dates ±3 days — not a light-curve fit.
Historic peak
19.3
COBS / analyzed peak 2020-06-28
Catalog ingest
10h ago
Venator last wrote this row 2026-09-16 13:20:18 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
3.380 au
e
0.4630
i
19.20°
Ω
93.80°
ω
193.00°
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
378P/McNaught
378P · 2026-09-14 18:27:59 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:59 UTC → current
Contributors
CCD Observer · HIL04 · 4 reports · last 1829d ago
CCD Observer · PAP04 · 1 reports · last 1993d ago
CCD Observer · MAI01 · 1 reports · last 1457d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.