---
title: "LTT 9779 b"
url: "https://spacecatalog.org/object/ltt-9779-b"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "SpaceCatalog. LTT 9779 b [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ltt-9779-b"
---

# LTT 9779 b

LTT 9779 b is a Neptune-like [planet](https://spacecatalog.org/planets) in the constellation [Sculptor](https://spacecatalog.org/constellation/sculptor), 262.4 ly from Earth. It orbits LTT 9779 at a mean distance of 0.01679 AU. It has a mass of 29.32 M⊕ and a radius of 4.72 R⊕ · 30 105 km. It was discovered in 2020.

## At a glance

- **WHAT IT IS:** Neptune-like planet
- **HOW FAR:** 262.4 ly — The light arriving now left it that long ago.
- **HOW BIG:** 4.72 R⊕ · 30 105 km — Its radius: half the width across.
- **WHERE TO LOOK:** [Sculptor](https://spacecatalog.org/constellation/sculptor) — The patch of sky it sits in, as seen from Earth.
- **ONE ORBIT TAKES:** 19.0 h — One trip round LTT 9779.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Neptune-like planet |
| MASS | 29.32 M⊕ +0.78 / −0.81 |
| RADIUS | 4.72 R⊕ · 30 105 km ±1467 |
| DISTANCE FROM EARTH | 262.4 ly ±1 — by NASA Exoplanet Archive sy\_dist (TICv8, 2019AJ....158..138S) |
| ORBITS | LTT 9779 |
| SEMI-MAJOR AXIS | 0.01679 AU +0.00014 / −0.00012 |
| CONSTELLATION | Sculptor |
| RIGHT ASCENSION (J2000) | 23h 54m 40.5s |
| DECLINATION (J2000) | −37° 37′ 41.6″ |
| DISCOVERED | 2020 |

## 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 | 1978 K |
| Host star spectral type | G7 V |
| Host star temperature | 5443 +14 / −13 K |
| Host star mass | 1.02 +0.02 / −0.03 M☉ |
| Host star radius | 0.949 ±0.006 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) | 9.79 |

### 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 | LTT 9779 |
| Orbital period | 0.792052 days ±9.3×10⁻⁶ |
| Eccentricity | 0 |
| Inclination | 76.39 ±0.43° |
| Argument of periastron | 90° |
| Transit midpoint | 2458354.2143 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 | Transiting Exoplanet Survey Satellite (TESS) |

## Also known as

- Exoplanet: LTT 9779 b
- Host star: LTT 9779

## 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. LTT 9779 b \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ltt-9779-b

```bibtex
@misc{spacecatalog_ltt-9779-b,
  author       = {{SpaceCatalog}},
  title        = {{LTT 9779 b}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ltt-9779-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/ltt-9779-b