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C/1998 K1

C/1998 K1 (Mueller)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 10040 days ago at mag 32.1. Historic peak was mag 15.4. 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

32.1

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

21

Arc unknown

Last observation

10040d ago

Mon, 22 Mar 1999 17:31:12 GMT · COBS consensus

Perihelion

1998-08-19

3.410 au

Peak window

1998-04-01 → 1998-08-22

COBS peak mag 15.4 on 1998-04-04 · perihelion 1998-08-19. Window is those dates ±3 days — not a light-curve fit.

Historic peak

15.4

COBS / analyzed peak 1998-04-04

Catalog ingest

11h ago

Venator last wrote this row 2026-09-16 13:20:16 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.

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

3.410 au

e

0.9450

i

35.60°

Ω

18.20°

ω

165.00°

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/1998 K1 (Mueller)

    Informal: Mueller

    C/1998 K1 · 2026-09-14 18:27:54 UTC → current

Discoverers

  • Mueller

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

Contributors

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