LIVE
VERDICTCase #00482 — 3I/Atlas anomalous brightening event marked WatchingDISCLOSUREAARO Annual Report to Congress — FY2025 released 20 July 20263I/ATLASLive position 06h 54m 22s · +20° 16′ 24″ · magnitude 25.4 · 2.39 AUHEARINGCase #00499 PURSUE Release 5 hard-ceiling verdict-move review on Watching-with-widening-cadence-drift opens 2026-08-07; Case #00504 Senate FY27 UAPDA companion status unknown at this filing pending Senate NDAA action — 7 August 2026EDITIONEdition #196 published 31 July 2026 — daily Brief queued for 07:00 UTCVERDICTCase #00482 — 3I/Atlas anomalous brightening event marked WatchingDISCLOSUREAARO Annual Report to Congress — FY2025 released 20 July 20263I/ATLASLive position 06h 54m 22s · +20° 16′ 24″ · magnitude 25.4 · 2.39 AUHEARINGCase #00499 PURSUE Release 5 hard-ceiling verdict-move review on Watching-with-widening-cadence-drift opens 2026-08-07; Case #00504 Senate FY27 UAPDA companion status unknown at this filing pending Senate NDAA action — 7 August 2026EDITIONEdition #196 published 31 July 2026 — daily Brief queued for 07:00 UTC
THE COUNCIL · CASE OF RECORD · THE COUNCIL · CASE OF RECORD ·MMXXVIThe Council
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Active object · Watching

3I/Atlas — third interstellar object on record

An interstellar comet detected in 2025, currently transiting the inner solar system. The Council is monitoring after a reported anomalous brightening on 23 April 2026.

Right ascension

2026-06-03
06h 54m 22s
Source: JPL Horizons

Declination

2026-06-03
+20° 16′ 24″
Source: JPL Horizons

Apparent magnitude

2026-06-03
25.4
Source: MPC photometry log

Distance from Earth

2026-06-03
2.39 AU
357,538,911 km
Source: JPL Horizons
Heliocentric velocity41.2 km/s
Designation3I/Atlas
StatusWatching
Council case#00482

What the Council is watching for

Three classes of evidence will move our verdict on 3I/Atlas off "Watching":

  1. Spectroscopy. Gas emission lines would confirm cometary activity and resolve the brightening event as a natural outburst.
  2. Polarimetry. The polarization signature distinguishes dust scattering from other sources of light.
  3. Non-gravitational acceleration. Any deviation from a purely gravitational orbit fit would itself be significant; outgassing is the standard explanation, but the magnitude matters.

Observation guidance

At magnitude 25.4, 3I/Atlas is below naked-eye and binocular limits. An 8-inch (203 mm) or larger telescope on a tracking mount is required. The Council's recommended consumer scope for this object is theCelestron NexStar 8SE; finder charts will be published in tomorrow's brief.

Related

Active case file: Case #00482 — Anomalous brightening event of 23 April 2026.