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Early warning for newly discovered comets and unconfirmed objects.

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C/1999 Y1

C/1999 Y1 (LINEAR)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 9000 days ago at mag 30.4. Historic peak was mag 11.6. 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

30.4

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

389

Arc unknown

Last observation

9001d ago

Fri, 25 Jan 2002 14:52:48 GMT · COBS consensus

Perihelion

2001-03-26

3.120 au

Peak window

2000-10-13 → 2001-03-29

COBS peak mag 11.6 on 2000-10-16 · perihelion 2001-03-26. Window is those dates ±3 days — not a light-curve fit.

Historic peak

11.6

COBS / analyzed peak 2000-10-16

Catalog ingest

2d ago

Venator last wrote this row 2026-09-14 20:00:16 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

3.120 au

e

1.0000

i

135.00°

Ω

189.00°

ω

184.00°

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/1999 Y1 (LINEAR)

    Informal: LINEAR

    C/1999 Y1 · 2026-09-14 18:27:54 UTC → current

Discoverers

  • LINEAR

    Discoverer · parsed-name · 2026-09-14 18:27:54 UTC → current

Contributors

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