C/2012 S1 (ISON) MPC191584
C/2012 S1 (ISON) MPC191584
Visibility unknown. No recent magnitude. Large facilities may still recover it if an ephemeris exists.
Right ascension
07h 34m 54s
J2000
Declination
+36° 45′ 31″
J2000
Estimated magnitude
—
Unknown
Confidence
41
Class D · priority 50
Observations
0
Arc unknown
Last observation
Not in feed
Feed does not publish an observer timestamp. Catalog ingested 43h ago.
Perihelion
2013-11-28
0.014 au
Peak window
2013-11-28
Using perihelion as a stand-in for peak. Dust comets often brighten a few days later.
Historic peak
—
No peak date yet
Catalog ingest
43h ago
Venator last wrote this row 2026-11-05 09:04:48 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
0.014 au
e
1.0000
i
58.51°
Ω
297.00°
ω
345.13°
a
—
MOID
—
H
8.5
H0 / n
8.5 / 3.2
NEO score
—
PHA score
—
RMS
—
Elongation
113°
Reporting sources
MPC AllCometEls
okFull MPC comet orbit catalog. Stored even when fainter than the UI default of mag 22.
Name history
C/2012 S1 (ISON) MPC191584
C/2012 S1 (ISON) MPC191584 · 2026-09-14 18:28:49 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:28:49 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.