C/2021 S4 (Tsuchinshan) MPC xxxxx
C/2021 S4 (Tsuchinshan) MPC xxxxx
Visibility unknown. No recent magnitude. Large facilities may still recover it if an ephemeris exists.
Right ascension
10h 11m 04s
J2000
Declination
+22° 58′ 21″
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 47d ago.
Perihelion
2024-01-03
6.696 au
Peak window
2024-01-03
Using perihelion as a stand-in for peak. Dust comets often brighten a few days later.
Historic peak
—
No peak date yet
Catalog ingest
47d ago
Venator last wrote this row 2026-09-21 13:20:37 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
6.696 au
e
0.9555
i
17.48°
Ω
5.43°
ω
73.12°
a
150.571 au
MOID
—
H
9.7
H0 / n
9.7 / 4
NEO score
—
PHA score
—
RMS
—
Elongation
34°
Reporting sources
MPC AllCometEls
okFull MPC comet orbit catalog. Stored even when fainter than the UI default of mag 22.
Name history
C/2021 S4 (Tsuchinshan) MPC xxxxx
C/2021 S4 (Tsuchinshan) MPC xxxxx · 2026-09-21 13:20:37 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-21 13:20:37 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.