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Early warning for newly discovered comets and unconfirmed objects.

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C/1952 H1

C/1952 H1 (Mrkos)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 27074 days ago at mag 37.8. Historic peak was mag 8.9. 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

37.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

40

Arc unknown

Last observation

27074d ago

Fri, 01 Aug 1952 17:16:48 GMT · COBS consensus

Perihelion

1952-06-12

1.350 au

Peak window

1952-06-09 → 1952-07-23

COBS peak mag 8.9 on 1952-07-20 · perihelion 1952-06-12. Window is those dates ±3 days — not a light-curve fit.

Historic peak

8.9

COBS / analyzed peak 1952-07-20

Catalog ingest

11h 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.

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

1.350 au

e

0.9810

i

113.00°

Ω

122.00°

ω

145.00°

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/1952 H1 (Mrkos)

    Informal: Mrkos

    C/1952 H1 · 2026-09-14 18:27:57 UTC → current

Discoverers

  • Mrkos

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

Contributors

  • Albert F. Jones

    Visual Observer · JON · 18 reports · last 27074d ago

  • Max Beyer

    Visual Observer · BEY · 12 reports · last 27091d ago

  • A. M. Bakcharev

    Visual Observer · BAK02 · 6 reports · last 27101d ago

  • G. Merton

    Visual Observer · MER02 · 2 reports · last 27146d ago

  • G.E.D. Alcock

    Visual Observer · ALC · 2 reports · last 27142d ago

  • N. V. Steshenko

    Visual Observer · STE13 · 2 reports · last 27103d ago

  • D. J. Fulcher

    Visual Observer · FUL01 · 1 reports · last 27107d ago

  • I. M. Veprynska

    Visual Observer · VEP · 1 reports · last 27103d ago

  • W. T. Gayfer

    Visual Observer · GAY · 1 reports · last 27091d ago

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