---
title: "HIP 79431 b"
url: "https://spacecatalog.org/object/hip-79431-b"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "SpaceCatalog. HIP 79431 b [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-79431-b"
---

# HIP 79431 b

HIP 79431 b is a gas giant in the constellation [Scorpius](https://spacecatalog.org/constellation/scorpius), 47.40 ly from Earth. It orbits HIP 79431 at a mean distance of 0.36 AU. It has a mass of 2.10 M♃ and a radius of 1.20 R♃ · 85 467 km. It was discovered in 2009.

## At a glance

- **WHAT IT IS:** Gas giant
- **HOW FAR:** 47.40 ly — The light arriving now left it that long ago.
- **HOW BIG:** 1.20 R♃ · 85 467 km — Its radius: half the width across.
- **WHERE TO LOOK:** [Scorpius](https://spacecatalog.org/constellation/scorpius) — The patch of sky it sits in, as seen from Earth.
- **ONE ORBIT TAKES:** 112 days — One trip round HIP 79431.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Gas giant |
| MASS | 2.10 M♃ |
| RADIUS | 1.20 R♃ · 85 467 km |
| DISTANCE FROM EARTH | 47.40 ly ±0.084 — by NASA Exoplanet Archive sy\_dist (TICv8, 2019AJ....158..138S) |
| ORBITS | HIP 79431 |
| SEMI-MAJOR AXIS | 0.36 AU |
| CONSTELLATION | Scorpius |
| RIGHT ASCENSION (J2000) | 16h 12m 41.8s |
| DECLINATION (J2000) | −18° 52′ 35.1″ |
| DISCOVERED | 2009 |

## 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 | 177.42 K |
| Host star spectral type | M3 V |
| Host star temperature | 3191 ±1000 K |
| Host star mass | 0.49 ±0.05 M☉ |
| Host star radius | 0.478625 ±0.014 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) | 11.39 |

### 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 | HIP 79431 |
| Orbital period | 111.7 days ±0.7 |
| Eccentricity | 0.29 ±0.02 |
| Argument of periastron | 287.4 ±3.2° |
| Periastron epoch | 2454980.3000 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 | Radial Velocity |
| Discovered at | W. M. Keck Observatory |

## Also known as

- Exoplanet: HIP 79431 b
- Host star: HIP 79431

## 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. HIP 79431 b \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-79431-b

```bibtex
@misc{spacecatalog_hip-79431-b,
  author       = {{SpaceCatalog}},
  title        = {{HIP 79431 b}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hip-79431-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/hip-79431-b