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C/1988 P1

C/1988 P1 (Machholz)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 13849 days ago at mag 34.1. 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

34.1

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

144

Arc unknown

Last observation

13849d ago

Mon, 17 Oct 1988 04:47:59 GMT · COBS consensus

Perihelion

1988-08-30

0.158 au

Peak window

1988-08-27 → 1988-09-02

COBS peak mag -0.7 on 1988-08-30 · perihelion 1988-08-30. Window is those dates ±3 days — not a light-curve fit.

Historic peak

-0.7

COBS / analyzed peak 1988-08-30

Catalog ingest

11h ago

Venator last wrote this row 2026-09-16 13:20:17 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

0.158 au

e

1.0000

i

40.80°

Ω

167.00°

ω

349.00°

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/1988 P1 (Machholz)

    Informal: Machholz

    C/1988 P1 · 2026-09-14 18:27:57 UTC → current

Discoverers

  • Machholz

    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.