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Early warning for newly discovered comets and unconfirmed objects.

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450P

450P/LONEOS

CometClass Ecatalogued
Northern hemisphere

Not visible to typical instruments. Current estimate mag 22.4. Visual and most CCD amateur setups will not see it. Space telescopes or large ground telescopes are the remaining path.

Active comet in COBS

JSONCSV

Right ascension

10h 03m 04s

J2000

Declination

+14° 44′ 38″

J2000

Estimated magnitude

22.4

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

47

Arc unknown

Last observation

43d ago

Fri, 25 Sep 2026 03:35:59 GMT · COBS consensus

Perihelion

2027-06-25

5.320 au

Peak window

2027-02-15 → 2027-06-28

COBS peak mag 21.8 on 2027-02-18 · perihelion 2027-06-25. Window is those dates ±3 days — not a light-curve fit.

Historic peak

21.8

COBS / analyzed peak 2027-02-18

Catalog ingest

14h ago

Venator last wrote this row 2026-11-06 14:20:24 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

5.320 au

e

0.2580

i

11.20°

Ω

124.00°

ω

36.30°

a

7.170 au

MOID

—

H

—

H0 / n

6.5 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

61°

Reporting sources

  • COBS comet list

    ok

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

  • COBS orbits

    ok

    Osculating elements and photometric parameters (H0, n) for active comets.

Name history

  • 450P/LONEOS

    450P · 2026-09-13 22:21:23 UTC → current

Discoverers

  • LONEOS

    Discoverer · parsed-name · 2026-09-13 22:21:23 UTC → current

Contributors

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