---
title: "PHL 1811"
url: "https://spacecatalog.org/object/phl-1811"
release: "DR1"
licence: "CC-BY-4.0"
citation: "SpaceCatalog. PHL 1811 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/phl-1811"
---

# PHL 1811

PHL 1811 is a quasar in the constellation [Capricornus](https://spacecatalog.org/constellation/capricornus), 3.009 Gly from Earth.

A luminous quasar that emits almost no X-rays at all, which the standard picture of a hot corona above an accretion disc does not permit. Enough similar objects have been found since that they are named after this one.

## At a glance

- **WHAT IT IS:** Quasar
- **HOW FAR:** 3.009 Gly — A luminosity distance, from its redshift — how faint it looks. The light itself left 2.32 billion years ago.
- **WHERE TO LOOK:** [Capricornus](https://spacecatalog.org/constellation/capricornus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Quasar |
| DISTANCE FROM EARTH | 3.009 Gly — by luminosity distance from a published redshift, flat ΛCDM with H0 = 70 km/s/Mpc |
| CONSTELLATION | Capricornus |
| RIGHT ASCENSION (J2000) | 21h 55m 01.5s |
| DECLINATION (J2000) | −09° 22′ 24.3″ |

## 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 |
| --- | --- |
| Accretion state | quasar — a thin disc near its Eddington limit |

### WHERE IT IS AND HOW IT MOVES

Position, motion across the sky and the size it covers on it. These are measurements of the object as seen from here, so every one of them depends on where here is.

| Field | Value |
| --- | --- |
| Redshift (z) | 0.1898 |

## Also known as

- Common name: PHL 1811

## Source

[SpaceCatalog curated data](https://spacecatalog.org/releases) — CC-BY-4.0

How this was made: https://spacecatalog.org/methods#source-curated

## Cite this page

SpaceCatalog. PHL 1811 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/phl-1811

```bibtex
@misc{spacecatalog_phl-1811,
  author       = {{SpaceCatalog}},
  title        = {{PHL 1811}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/phl-1811},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from SpaceCatalog curated data.}
}
```

SpaceCatalog curated data — CC-BY-4.0

The page itself, with its pictures, the sky map and the observing tools: https://spacecatalog.org/object/phl-1811