264P
264P/Larsen
Not currently visible. Last report 2718 days ago at mag 20.2. 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
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J2000
Estimated magnitude
20.2
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
6
Arc unknown
Last observation
2718d ago
Wed, 29 May 2019 21:35:59 GMT · COBS consensus
Perihelion
2027-03-23
2.680 au
Peak window
2027-03-20 → 2027-04-24
COBS peak mag 18.4 on 2027-04-21 · perihelion 2027-03-23. Window is those dates ±3 days — not a light-curve fit.
Historic peak
18.4
COBS / analyzed peak 2027-04-21
Catalog ingest
19m ago
Venator last wrote this row 2026-11-07 03:30:21 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
2.680 au
e
0.3370
i
25.50°
Ω
219.00°
ω
342.00°
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
264P/Larsen
264P · 2026-09-14 18:27:55 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:55 UTC → current
Contributors
CCD Observer · NAK01 · 4 reports · last 8182d ago
CCD Observer · NOV01 · 1 reports · last 5224d ago
CCD Observer · HIL04 · 1 reports · last 2718d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.