Planet ISO 3I

Detailed information about planet ISO 3I and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

ISO 3I

Planet Status

Candidate

Discovered in

2025

Publication Status

Announced on a website

Update

2025-07-14

Mass

—

Mass*sin(i)

—

Semi-Major Axis

—

Orbital Period

—

Eccentricity

6.2 (\pm 0.5)

2 publications

Object Summary -- A11pl3Z
Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS

Angular distance

—

ω

—

T_peri

—

Radius

—

Inclination

175.1 (\pm 0.1)

deg 1 publication

Object Summary -- A11pl3Z

Detection Method

Imaging

Mass Meas. Method

—

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

A11pl3Z, 3I/ATLAS

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

No remarks

No link

Star

Name

Sun

Distance

—

Spectral type

—

Apparent magnitude V

—

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

1.0 M_Sun

Age

—

Effective temperature

—

Radius

1.0 R_Sun

Metallicity [Fe/H]

—

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

00:00:00.0

Dec₂₀₀₀

+00:00:00.0

Alternate Names

No remarks

No link

Simbad
Most recent references (ADS)

Planet ISO 3I

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 0 planets

Remarks No remark

Other web pages No page

More data 2 references

Planet ISO 3I

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 0 planets

Remarks No remark

Other web pages No page

More data 2 references

Related publications

Comment on "Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS" [arXiv:2507.02757]

From a Different Star: 3I/ATLAS in the context of the Ōtautahi-Oxford interstellar object population model

Precovery Observations of 3I/ATLAS from TESS Suggests Possible Distant Activity

Intercepting 3I/ATLAS at Closest Approach to Jupiter with the Juno spacecraft

Analysis of Trajectories to 3I/ATLAS with a Comet Interceptor-like Spacecraft

Temporal Evolution of the Third Interstellar Comet 3I/ATLAS: Spin, Color, Spectra and Dust Activity

The Kinematic Age of 3I/ATLAS and its Implications for Early Planet Formation

Pre-discovery TESS Observations of Interstellar Object 3I/ATLAS

3I/ATLAS is Smaller or Rarer than It Looks

Near-Discovery Observations of Interstellar Comet 3I/ATLAS with the NASA Infrared Telescope Facility

Is the Interstellar Object 3I/ATLAS Alien Technology?

Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS

Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope

Object Summary -- A11pl3Z

NSF-DOE Vera C. Rubin Observatory Observations of Interstellar Comet 3I/ATLAS (C/2025 N1)

Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS

The Feasibility of a Spacecraft Flyby with the Third Interstellar Object 3I/ATLAS from Earth or Mars

Spectroscopic Characterization of Interstellar Object 3I/ATLAS: Water Ice in the Coma

Interstellar comet 3I/ATLAS: discovery and physical description

Initial VLT/MUSE spectroscopy of the interstellar object 3I/ATLAS

X-SHOOTER Spectrum of Comet 3I/ATLAS: Insights into a Distant Interstellar Visitor