---
title: "PSR J1804-2858"
url: "https://spacecatalog.org/object/psr-j1804m2858"
release: "DR1"
licence: "No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer"
citation: "SpaceCatalog. PSR J1804-2858 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1804m2858"
---

# PSR J1804-2858

PSR J1804-2858 is a millisecond pulsar in the constellation [Sagittarius](https://spacecatalog.org/constellation/sagittarius), 26 859 ly from Earth.

## At a glance

- **WHAT IT IS:** Millisecond pulsar
- **HOW FAR:** 26 859 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Sagittarius](https://spacecatalog.org/constellation/sagittarius) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Millisecond pulsar |
| DISTANCE FROM EARTH | 26 859 ly — by dispersion measure through the YMW16 electron-density model |
| CONSTELLATION | Sagittarius |
| RIGHT ASCENSION (J2000) | 18h 04m 01.5s |
| DECLINATION (J2000) | −28° 58′ 46.6″ |

## 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 |
| --- | --- |
| Spin period | 0.00149269 s |
| Spin-down rate | −7.57×10⁻²² s/s |

### 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 |
| --- | --- |
| Radio flux at 1400 MHz | 0.918 mJy |

### 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 |
| --- | --- |
| Proper motion (RA) | −6.4 ±0.5 mas/yr |
| Proper motion (Dec) | −11 ±5 mas/yr |
| Position epoch | J2016.100 |
| Position known to | 7.0 mas |
| Dispersion measure | 232.53 pc/cm³ |

## Also known as

- ATNF: J1804-2858
- ATNF: PSR J1804-2858

## Source

[ATNF Pulsar Catalogue (Manchester+ 2005)](https://www.atnf.csiro.au/research/pulsar/psrcat) — No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer

The producer asks: Manchester, R. N., Hobbs, G. B., Teoh, A. & Hobbs, M. 2005, AJ 129, 1993 (2005AJ....129.1993M); https://www.atnf.csiro.au/research/pulsar/psrcat

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

## Cite this page

SpaceCatalog. PSR J1804-2858 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1804m2858

```bibtex
@misc{spacecatalog_psr-j1804m2858,
  author       = {{SpaceCatalog}},
  title        = {{PSR J1804-2858}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/psr-j1804m2858},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from ATNF Pulsar Catalogue (Manchester+ 2005).}
}
```

ATNF Pulsar Catalogue (Manchester+ 2005) — No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer

Acknowledgement the producer asks for: Manchester, R. N., Hobbs, G. B., Teoh, A. & Hobbs, M. 2005, AJ 129, 1993 (2005AJ....129.1993M); https://www.atnf.csiro.au/research/pulsar/psrcat

The page itself, with its pictures, the sky map and the observing tools: https://spacecatalog.org/object/psr-j1804m2858