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C/1969 T1

C/1969 T1 (Tago-Sato-Kosaka)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 20643 days ago at mag 31.2. Historic peak was mag -0.7. Typical backyard telescopes will not show it. HST, JWST, or an 8–10 m class telescope might recover it with a good ephemeris.

Active comet in COBS

JSONCSV

Right ascension

—

J2000

Declination

—

J2000

Estimated magnitude

31.2

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

396

Arc unknown

Last observation

20643d ago

Fri, 01 May 1970 21:35:59 GMT · COBS consensus

Perihelion

1969-12-27

0.468 au

Peak window

1969-12-24 → 1970-01-11

COBS peak mag -0.7 on 1970-01-08 · perihelion 1969-12-27. Window is those dates ±3 days — not a light-curve fit.

Historic peak

-0.7

COBS / analyzed peak 1970-01-08

Catalog ingest

14h ago

Venator last wrote this row 2026-11-06 14:20:21 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

0.468 au

e

1.0000

i

75.40°

Ω

99.50°

ω

268.00°

a

—

MOID

—

H

—

H0 / n

—

NEO score

—

PHA score

—

RMS

—

Elongation

—

Reporting sources

  • COBS comet list

    ok

    Comet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).

Name history

  • C/1969 T1 (Tago-Sato-Kosaka)

    Informal: Tago-Sato-Kosaka

    C/1969 T1 · 2026-09-14 18:27:57 UTC → current

Discoverers

  • Tago-Sato-Kosaka

    Discoverer · parsed-name · 2026-09-14 18:27:57 UTC → current

Contributors

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Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.