---
title: "TYC 0434-04538-1 b"
url: "https://spacecatalog.org/object/tyc-0434-04538-1-b"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "SpaceCatalog. TYC 0434-04538-1 b [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/tyc-0434-04538-1-b"
---

# TYC 0434-04538-1 b

TYC 0434-04538-1 b is a gas giant in the constellation [Ophiuchus](https://spacecatalog.org/constellation/ophiuchus), 2001 ly from Earth. It orbits TYC 0434-04538-1 at a mean distance of 0.66 AU. It has a mass of 6.10 M♃ and a radius of 1.13 R♃ · 81 002 km. It was discovered in 2021.

## At a glance

- **WHAT IT IS:** Gas giant
- **HOW FAR:** 2001 ly — The light arriving now left it that long ago.
- **HOW BIG:** 1.13 R♃ · 81 002 km — Its radius: half the width across.
- **WHERE TO LOOK:** [Ophiuchus](https://spacecatalog.org/constellation/ophiuchus) — The patch of sky it sits in, as seen from Earth.
- **ONE ORBIT TAKES:** 193 days — One trip round TYC 0434-04538-1.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Gas giant |
| MASS | 6.10 M♃ ±0.7 |
| RADIUS | 1.13 R♃ · 81 002 km |
| DISTANCE FROM EARTH | 2001 ly ±79 — by NASA Exoplanet Archive sy\_dist (TICv8, 2019AJ....158..138S) |
| ORBITS | TYC 0434-04538-1 |
| SEMI-MAJOR AXIS | 0.66 AU ±0.04 |
| CONSTELLATION | Ophiuchus |
| RIGHT ASCENSION (J2000) | 18h 05m 21.5s |
| DECLINATION (J2000) | +02° 03′ 44.2″ |
| DISCOVERED | 2021 |

## 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 | 877.8 K |
| Host star temperature | 4679 ±10 K |
| Host star mass | 1.04 ±0.15 M☉ |
| Host star radius | 9.99 ±1.6 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) | 10.25 |

### 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 | TYC 0434-04538-1 |
| Orbital period | 193.2 days ±0.4 |
| Eccentricity | 0.08 +0.05 / −0.03 |
| Argument of periastron | 196 +30 / −34° |
| Periastron epoch | 2454829.5000 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 | Multiple Observatories |

## Also known as

- Exoplanet: TYC 0434-04538-1 b
- Host star: TYC 0434-04538-1

## 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. TYC 0434-04538-1 b \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/tyc-0434-04538-1-b

```bibtex
@misc{spacecatalog_tyc-0434-04538-1-b,
  author       = {{SpaceCatalog}},
  title        = {{TYC 0434-04538-1 b}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/tyc-0434-04538-1-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/tyc-0434-04538-1-b