P/2020 K9
P/2020 K9 (Lemmon-PANSTARRS)
Not currently visible. Last report 2128 days ago at mag 23.6. Historic peak was mag 18.4. 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
23.6
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
1
Arc unknown
Last observation
2128d ago
Wed, 18 Nov 2020 18:14:24 GMT · COBS consensus
Perihelion
2029-09-29
2.860 au
Peak window
2029-09-26 → 2029-10-02
COBS peak mag 18.4 on 2029-09-29 · perihelion 2029-09-29. Window is those dates ±3 days — not a light-curve fit.
Historic peak
18.4
COBS / analyzed peak 2029-09-29
Catalog ingest
13h 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
2.860 au
e
0.3200
i
23.20°
Ω
166.00°
ω
197.00°
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
P/2020 K9 (Lemmon-PANSTARRS)
Informal: Lemmon-PANSTARRS
P/2020 K9 · 2026-09-14 18:27:59 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-14 18:27:59 UTC → 2026-09-16 13:20:18 UTC
Contributors
CCD Observer · PAP04 · 1 reports · last 2128d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.