C/1947 X1
C/1947 X1 (Southern comet)
Not currently visible. Last report 28744 days ago at mag 38.8. Historic peak was mag -1.3. 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
38.8
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
10
Arc unknown
Last observation
28744d ago
Tue, 06 Jan 1948 10:04:47 GMT · COBS consensus
Perihelion
1947-10-14
0.094 au
Peak window
1947-10-11 → 1947-10-17
COBS peak mag -1.3 on 1947-10-14 · perihelion 1947-10-14. Window is those dates ±3 days — not a light-curve fit.
Historic peak
-1.3
COBS / analyzed peak 1947-10-14
Catalog ingest
16h ago
Venator last wrote this row 2026-09-16 13:20:18 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.
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
0.094 au
e
1.0000
i
135.00°
Ω
336.00°
ω
195.00°
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/1947 X1 (Southern comet)
Informal: Southern comet
C/1947 X1 · 2026-09-14 18:27:57 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:57 UTC → current
Contributors
Visual Observer · JON · 10 reports · last 28744d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.