P/2011 A2
P/2011 A2 (Scotti)
Difficult — CCD / large telescope. Around mag 14.9. A large amateur CCD or a professional telescope is required. Historic peak was mag 12.6.
Right ascension
04h 21m 52s
J2000
Declination
+20° 39′ 26″
J2000
Estimated magnitude
14.9
CCD / citizen telescope · COBS consensus
Confidence
33
Class E · priority 76
Observations
42
80.00 d arc
Last observation
8d ago
Tue, 08 Sep 2026 19:57:21 GMT · COBS consensus
Perihelion
2016-06-14
1.550 au
Peak window
2016-05-22 → 2016-06-17
COBS peak mag 12.6 on 2016-05-25 · perihelion 2016-06-14. Window is those dates ±3 days — not a light-curve fit.
Historic peak
12.6
COBS / analyzed peak 2016-05-25
Catalog ingest
8m ago
Venator last wrote this row 2026-09-16 23:00:05 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
1.550 au
e
0.5000
i
4.48°
Ω
54.70°
ω
94.60°
a
3.110 au
MOID
—
H
—
H0 / n
9.0 / 4
NEO score
—
PHA score
—
RMS
—
Elongation
107°
Reporting sources
COBS comet list
okComet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).
COBS orbits
okOsculating elements and photometric parameters (H0, n) for active comets.
Name history
P/2011 A2 (Scotti)
Informal: Scotti
P/2011 A2 · 2026-09-08 02:09:56 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-08 17:27:23 UTC → current
Contributors
- No recent COBS visual or CCD reports linked yet.
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.