420P
420P/Hill
Not currently visible. Last report 1511 days ago at mag 24.9. Historic peak was mag 17.5. 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
24.9
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
4
Arc unknown
Last observation
1511d ago
Fri, 29 Jul 2022 02:49:00 GMT · COBS consensus
Perihelion
2022-05-13
2.770 au
Peak window
2022-05-10 → 2022-09-10
COBS peak mag 17.5 on 2022-09-07 · perihelion 2022-05-13. Window is those dates ±3 days — not a light-curve fit.
Historic peak
17.5
COBS / analyzed peak 2022-09-07
Catalog ingest
12h 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
2.770 au
e
0.4940
i
14.60°
Ω
173.00°
ω
156.00°
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
420P/Hill
420P · 2026-09-14 18:28:01 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:28:01 UTC → current
Contributors
CCD Observer · PAP04 · 2 reports · last 1955d ago
CCD Observer · CHE09 · 1 reports · last 6211d ago
CCD Observer · CAR06 · 1 reports · last 1511d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.