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Venator

Early warning for newly discovered comets and unconfirmed objects.

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450P

450P/LONEOS

CometClass Ecatalogued
Northern hemisphere

Difficult — CCD / large telescope. Around mag 17.8. A large amateur CCD or a professional telescope is required.

Active comet in COBS

JSONCSV

Right ascension

09h 36m 33s

J2000

Declination

+16° 18′ 12″

J2000

Estimated magnitude

17.8

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 66

Observations

47

Arc unknown

Last observation

160d ago

Thu, 09 Apr 2026 23:31:12 GMT · COBS consensus

Perihelion

2027-06-08

5.330 au

Peak window

2027-02-15 → 2027-06-11

COBS peak mag 17.0 on 2027-02-18 · perihelion 2027-06-08. Window is those dates ±3 days — not a light-curve fit.

Historic peak

17.0

COBS / analyzed peak 2027-02-18

Catalog ingest

19m ago

Venator last wrote this row 2026-09-17 01:00:04 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

5.330 au

e

0.2660

i

11.20°

Ω

124.00°

ω

35.20°

a

7.260 au

MOID

—

H

—

H0 / n

6.5 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

33°

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.