258P
258P/PANSTARRS
Not currently visible. Last report 1982 days ago at mag 22.9. Historic peak was mag 20.5. 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
22.9
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
1
Arc unknown
Last observation
1982d ago
Tue, 13 Apr 2021 21:50:24 GMT · COBS consensus
Perihelion
2029-08-29
3.460 au
Peak window
2020-02-01 → 2029-09-01
COBS peak mag 20.5 on 2020-02-04 · perihelion 2029-08-29. Window is those dates ±3 days — not a light-curve fit.
Historic peak
20.5
COBS / analyzed peak 2020-02-04
Catalog ingest
12h ago
Venator last wrote this row 2026-09-16 13:20:17 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
3.460 au
e
0.2100
i
6.75°
Ω
126.00°
ω
25.80°
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
258P/PANSTARRS
258P · 2026-09-14 18:27:56 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:56 UTC → current
Contributors
CCD Observer · PAP04 · 1 reports · last 1982d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.