C/2025 K1-B (ATLAS)

COMETHyperbolic comet

ILLUSTRATION FROM PERIHELION 0.336 AU · ECCENTRICITY 1.002

[

OVERVIEW

] COMET

C/2025 K1-B (ATLAS) is a hyperbolic comet. Its orbit does not close: it passes within 0.336 of the Sun once and never returns.

WHAT IT IS: Hyperbolic comet

[

CATALOG DATA

] 11 FIELDS

The raw catalogue values, as the source published them, with the error bars where one was published — sorted by what each set of figures is about rather than by the order they happened to be stored in.

THE ORBIT

The shape of the path, where the object sits on it, and the instant those figures were true of. An orbit is a fit to observations and drifts away from the real one either side of its epoch.

Eccentricity
Hyperbolic excess velocity: 2.32 ±0.045
Inclination: 147.92
Longitude of ascending node: 97.64
Argument of perihelion: 271.33 ±0.014
Mean anomaly: 0.02
Element epoch: 2460997.5000
Perihelion passage: 2460956.9500
Minimum distance from Earth's orbit: 0.156
Orbit class: HYP

WHEN IT WAS FOUND

Who first saw it, from where, and by what method.

First observed: 2025-11-05

[

ALSO KNOWN AS

] 2 DESIGNATIONS

Comet 2025 K1-B
Comet C/2025 K1-B (ATLAS)

[

CITE THIS PAGE

] DR1

This page is live and its numbers move when an upstream refreshes, so the citation names the release the rows belong to rather than the day you read them. The release itself is frozen, republished as a bundle, and is what a data-availability statement should point at.

PLAIN TEXT

SpaceCatalog. C/2025 K1-B (ATLAS) [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/c-2025-k1-b-atlas

BIBTEX

@misc{spacecatalog_c-2025-k1-b-atlas,
  author       = {{SpaceCatalog}},
  title        = {{C/2025 K1-B (ATLAS)}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/c-2025-k1-b-atlas},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from JPL Small-Body Database.}
}

The values above were taken from JPL Small-Body Database — Public domain (NASA/JPL). Citing this page does not replace citing that catalogue.

[

RELATED OBJECTS

] 8 LINKED

NAME

CLASS

MASS

DISTANCE

MAG

CONSTELLATION

C/1853 L1 (Klinkerfues)