---
title: "PSR J1901+0331"
url: "https://spacecatalog.org/object/psr-j1901p0331"
release: "DR1"
licence: "No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer"
citation: "SpaceCatalog. PSR J1901+0331 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1901p0331"
---

# PSR J1901+0331

PSR J1901+0331 is a pulsar in the constellation [Aquila](https://spacecatalog.org/constellation/aquila), 19 723 ly from Earth. Other catalogues list it as B1859+03 and PSR B1859+03.

## At a glance

- **WHAT IT IS:** Pulsar
- **HOW FAR:** 19 723 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Aquila](https://spacecatalog.org/constellation/aquila) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Pulsar |
| DISTANCE FROM EARTH | 19 723 ly — by dispersion measure through the YMW16 electron-density model |
| CONSTELLATION | Aquila |
| RIGHT ASCENSION (J2000) | 19h 01m 31.8s |
| DECLINATION (J2000) | +03° 31′ 06.0″ |

## 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 |
| --- | --- |
| Surface magnetic field | 2.24×10¹² G |
| Spin period | 0.655456 s |
| Spin-down rate | 7.46×10⁻¹⁵ s/s |
| Characteristic age | 1 392 211 yr |
| Spin-down luminosity | 1.05×10³³ erg/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 | 4.2 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) | −7 ±2 mas/yr |
| Proper motion (Dec) | −45 ±5 mas/yr |
| Position epoch | J2007.643 |
| Position known to | 76 mas |
| Dispersion measure | 401.19 pc/cm³ |

## Also known as

- ATNF: B1859+03
- ATNF: J1901+0331
- ATNF: PSR B1859+03
- ATNF: PSR J1901+0331

## 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 J1901+0331 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j1901p0331

```bibtex
@misc{spacecatalog_psr-j1901p0331,
  author       = {{SpaceCatalog}},
  title        = {{PSR J1901+0331}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/psr-j1901p0331},
  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-j1901p0331