---
title: "EPIC 229004835 b"
url: "https://spacecatalog.org/object/epic-229004835-b"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "SpaceCatalog. EPIC 229004835 b [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/epic-229004835-b"
---

# EPIC 229004835 b

EPIC 229004835 b is a Neptune-like [planet](https://spacecatalog.org/planets) in the constellation [Virgo](https://spacecatalog.org/constellation/virgo), 397.8 ly from Earth. It orbits EPIC 229004835 at a mean distance of 0.1237 AU. It has a mass of 10.40 M⊕ and a radius of 2.33 R⊕ · 14 874 km. It was discovered in 2023.

## At a glance

- **WHAT IT IS:** Neptune-like planet
- **HOW FAR:** 397.8 ly — The light arriving now left it that long ago.
- **HOW BIG:** 2.33 R⊕ · 14 874 km — Its radius: half the width across.
- **WHERE TO LOOK:** [Virgo](https://spacecatalog.org/constellation/virgo) — The patch of sky it sits in, as seen from Earth.
- **ONE ORBIT TAKES:** 16.1 days — One trip round EPIC 229004835.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Neptune-like planet |
| MASS | 10.40 M⊕ +1.6 / −1.5 |
| RADIUS | 2.33 R⊕ · 14 874 km +510 / −600 |
| DISTANCE FROM EARTH | 397.8 ly +2.9 / −2.8 — by NASA Exoplanet Archive sy\_dist (TICv8, 2019AJ....158..138S) |
| ORBITS | EPIC 229004835 |
| SEMI-MAJOR AXIS | 0.1237 AU ±0.0017 |
| CONSTELLATION | Virgo |
| RIGHT ASCENSION (J2000) | 12h 25m 56.6s |
| DECLINATION (J2000) | −01° 24′ 17.0″ |
| DISCOVERED | 2023 |

## Catalogue data

### WHAT KIND OF THING IT IS

What the object is in itself, rather than how it happens to look from here.

| Field | Value |
| --- | --- |
| Equilibrium temperature | 804 K |
| Host star temperature | 5868 ±60 K |
| Host star mass | 0.97 ±0.04 M☉ |
| Host star radius | 0.999 ±0.008 R☉ |

### HOW BRIGHT IT IS

What the light adds up to, measured through one filter at a time. A magnitude is a brightness on a backwards scale — the smaller the number, the brighter the object.

| Field | Value |
| --- | --- |
| Host star apparent magnitude (V) | 10.23 |

### 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.

| Field | Value |
| --- | --- |
| Host star | EPIC 229004835 |
| Orbital period | 16.141132 days ±1.9×10⁻⁵ |
| Eccentricity, upper limit | 0.23 |
| Inclination | 88.08 +0.26 / −0.24° |
| Transit midpoint | 2457920.4458 BJD |
| Stars in system | 1 |
| Planets in system | 1 |

### WHEN IT WAS FOUND

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

| Field | Value |
| --- | --- |
| Discovery method | Transit |
| Discovered at | K2 |

## Also known as

- Exoplanet: EPIC 229004835 b
- Host star: EPIC 229004835

## Source

[NASA Exoplanet Archive (Planetary Systems Composite Parameters)](https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars) — No licence stated; acknowledgement requested

The producer asks: This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Cite Christiansen et al. (2025), Planetary Science Journal (doi:10.3847/PSJ/ade3c2), and the literature reference given with each value.

How this was made: https://spacecatalog.org/methods#source-exoplanet-archive

## Cite this page

SpaceCatalog. EPIC 229004835 b \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/epic-229004835-b

```bibtex
@misc{spacecatalog_epic-229004835-b,
  author       = {{SpaceCatalog}},
  title        = {{EPIC 229004835 b}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/epic-229004835-b},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from NASA Exoplanet Archive (Planetary Systems Composite Parameters).}
}
```

NASA Exoplanet Archive (Planetary Systems Composite Parameters) — No licence stated; acknowledgement requested

Acknowledgement the producer asks for: This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Cite Christiansen et al. (2025), Planetary Science Journal (doi:10.3847/PSJ/ade3c2), and the literature reference given with each value.

The page itself, with its pictures, the sky map and the observing tools: https://spacecatalog.org/object/epic-229004835-b