C/2001 A2-A
C/2001 A2-A (LINEAR)
Not currently visible. Last report 9252 days ago at mag 38.5. Historic peak was mag 11.0. 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
38.5
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
6
Arc unknown
Last observation
9252d ago
Sat, 19 May 2001 07:55:11 GMT · COBS consensus
Perihelion
2001-05-11
0.796 au
Peak window
2001-05-08 → 2001-05-14
COBS peak mag 11.0 on 2001-05-11 · perihelion 2001-05-11. Window is those dates ±3 days — not a light-curve fit.
Historic peak
11.0
COBS / analyzed peak 2001-05-11
Catalog ingest
2d ago
Venator last wrote this row 2026-09-14 20:00:18 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
0.796 au
e
1.0000
i
36.40°
Ω
296.00°
ω
295.00°
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
C/2001 A2-A (LINEAR)
Informal: LINEAR
C/2001 A2-A · 2026-09-14 18:27:58 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:58 UTC → current
Contributors
CCD Observer · BRO08 · 6 reports · last 9252d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.