---
title: "PSR J1705-1903"
url: "https://spacecatalog.org/object/psr-j1705m1903"
release: "DR1"
licence: "No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer"
citation: "SpaceCatalog. PSR J1705-1903 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1705m1903"
---

# PSR J1705-1903

PSR J1705-1903 is a millisecond pulsar in the constellation [Ophiuchus](https://spacecatalog.org/constellation/ophiuchus), 7645 ly from Earth.

## At a glance

- **WHAT IT IS:** Millisecond pulsar
- **HOW FAR:** 7645 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Ophiuchus](https://spacecatalog.org/constellation/ophiuchus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Millisecond pulsar |
| DISTANCE FROM EARTH | 7645 ly — by dispersion measure through the YMW16 electron-density model |
| CONSTELLATION | Ophiuchus |
| RIGHT ASCENSION (J2000) | 17h 05m 27.0s |
| DECLINATION (J2000) | −19° 08′ 04.0″ |

## 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 | 0.00248022 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 | 0.575 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 |
| --- | --- |
| Dispersion measure | 57.5 pc/cm³ |

## Also known as

- ATNF: J1705-1903
- ATNF: PSR J1705-1903

## 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 J1705-1903 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1705m1903

```bibtex
@misc{spacecatalog_psr-j1705m1903,
  author       = {{SpaceCatalog}},
  title        = {{PSR J1705-1903}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/psr-j1705m1903},
  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-j1705m1903