---
title: "LkCa 15 b"
url: "https://spacecatalog.org/object/lkca-15-b"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "SpaceCatalog. LkCa 15 b [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/lkca-15-b"
---

# LkCa 15 b

LkCa 15 b is an [exoplanet](https://spacecatalog.org/exoplanets) in the constellation [Taurus](https://spacecatalog.org/constellation/taurus), 515.8 ly from Earth. It orbits LkCa 15 at a mean distance of 14.7 AU. It was discovered in 2015.

## At a glance

- **WHAT IT IS:** Exoplanet
- **HOW FAR:** 515.8 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Taurus](https://spacecatalog.org/constellation/taurus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Exoplanet |
| DISTANCE FROM EARTH | 515.8 ly +4 / −3.9 — by NASA Exoplanet Archive sy\_dist (TICv8, 2019AJ....158..138S) |
| ORBITS | LkCa 15 |
| SEMI-MAJOR AXIS | 14.7 AU ±2.1 |
| CONSTELLATION | Taurus |
| RIGHT ASCENSION (J2000) | 04h 39m 17.8s |
| DECLINATION (J2000) | +22° 21′ 03.1″ |
| DISCOVERED | 2015 |

## 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 | 66.87 K |
| Host star temperature | 4194 ±130 K |
| Host star radius | 1.60711 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) | 12.03 |

### 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 | LkCa 15 |
| Inclination | 50° |
| Stars in system | 1 |
| Planets in system | 2 |

### WHEN IT WAS FOUND

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

| Field | Value |
| --- | --- |
| Discovery method | Imaging |
| Discovered at | Large Binocular Telescope Observatory |

## Also known as

- Exoplanet: LkCa 15 b
- Host star: LkCa 15

## 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. LkCa 15 b \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/lkca-15-b

```bibtex
@misc{spacecatalog_lkca-15-b,
  author       = {{SpaceCatalog}},
  title        = {{LkCa 15 b}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/lkca-15-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/lkca-15-b