---
title: "PSR J0102+4839"
url: "https://spacecatalog.org/object/psr-j0102p4839"
release: "DR1"
licence: "No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer"
citation: "SpaceCatalog. PSR J0102+4839 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j0102p4839"
---

# PSR J0102+4839

PSR J0102+4839 is a millisecond pulsar in the constellation [Andromeda](https://spacecatalog.org/constellation/andromeda), 7534 ly from Earth.

## At a glance

- **WHAT IT IS:** Millisecond pulsar
- **HOW FAR:** 7534 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Andromeda](https://spacecatalog.org/constellation/andromeda) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Millisecond pulsar |
| DISTANCE FROM EARTH | 7534 ly — by dispersion measure through the YMW16 electron-density model |
| CONSTELLATION | Andromeda |
| RIGHT ASCENSION (J2000) | 01h 02m 50.7s |
| DECLINATION (J2000) | +48° 39′ 42.8″ |

## 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 | 1.86×10⁸ G |
| Spin period | 0.00296411 s |
| Spin-down rate | 1.14×10⁻²⁰ s/s |
| Characteristic age | 4.11×10⁹ yr |
| Spin-down luminosity | 1.73×10³⁴ erg/s |

### 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) | −3.4 ±0.3 mas/yr |
| Proper motion (Dec) | −2.2 ±0.3 mas/yr |
| Position epoch | J2010.903 |
| Position known to | 0.8 mas |
| Dispersion measure | 53.5 pc/cm³ |

### 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 |
| --- | --- |
| Binary orbit model | ELL1 |

### OTHER NAMES AND NUMBERS

The identifiers other catalogues file this object under, for anyone joining this data to theirs.

| Field | Value |
| --- | --- |
| Associated with | GRS:4FGL\_J0102.8+4839\[aab+22\],GRS:3FGL\_J0102.8+4840\[bbc+24\] |

## Also known as

- ATNF: J0102+4839
- ATNF: PSR J0102+4839

## 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 J0102+4839 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j0102p4839

```bibtex
@misc{spacecatalog_psr-j0102p4839,
  author       = {{SpaceCatalog}},
  title        = {{PSR J0102+4839}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/psr-j0102p4839},
  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-j0102p4839