---
title: "The V342 Peg system"
url: "https://spacecatalog.org/system/hd-218396"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "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 V342 Peg system

V342 Peg is an F0+VkA5mA5 yellow-white star in Pegasus, 128.5 ly away, with 4 known planets. Their orbits run from 16 to 68 AU. All of them were detected by imaging.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [HR 8799 e](https://spacecatalog.org/object/hr-8799-e) | 16 | 56.99 yr | 13.11 R⊕ | 3180 M⊕ | 1150 K |
| [HR 8799 d](https://spacecatalog.org/object/hr-8799-d) | 24 | 101.3 yr | 13.00 R⊕ | 3000 M⊕ | 1300 K |
| [HR 8799 c](https://spacecatalog.org/object/hr-8799-c) | 38 | 188.9 yr | 13.00 R⊕ | 3000 M⊕ | 1200 K |
| [HR 8799 b](https://spacecatalog.org/object/hr-8799-b) | 68 | 465.4 yr | 13.00 R⊕ | 2000 M⊕ | 1200 K |

Every figure is the planet's composite parameter from the [NASA Exoplanet Archive (Planetary Systems Composite Parameters)](https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars), one consistent set per world. Semi-major axes are orbits about the star, not distances from Earth.

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 host star

| Quantity | Value |
| --- | --- |
| CLASS | F0+VkA5mA5 yellow-white star |
| SPECTRAL TYPE | F0+VkA5mA5 |
| SURFACE TEMPERATURE | 7187 K |
| LUMINOSITY | 5.56 L☉ |
| DISTANCE FROM EARTH | 128.5 ly |
| APPARENT MAGNITUDE | 5.97 |
| CONSTELLATION | Pegasus |

The star itself: https://spacecatalog.org/object/hd-218396

The page itself, with the orbits drawn: https://spacecatalog.org/system/hd-218396