---
title: "PSR J2129+1210H"
url: "https://spacecatalog.org/object/psr-j2129p1210h"
release: "DR1"
licence: "No licence stated; the database is ATNF/CSIRO property under the CSIRO Legal Notice and Disclaimer"
citation: "SpaceCatalog. PSR J2129+1210H [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j2129p1210h"
---

# PSR J2129+1210H

PSR J2129+1210H is a millisecond pulsar in the constellation [Pegasus](https://spacecatalog.org/constellation/pegasus), 33 624 ly from Earth. Other catalogues list it as B2127+11H and PSR B2127+11H.

## At a glance

- **WHAT IT IS:** Millisecond pulsar
- **HOW FAR:** 33 624 ly — The light arriving now left it that long ago.
- **WHERE TO LOOK:** [Pegasus](https://spacecatalog.org/constellation/pegasus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Millisecond pulsar |
| DISTANCE FROM EARTH | 33 624 ly +3865 / −3142 — by pulsar parallax (timing or VLBI) |
| CONSTELLATION | Pegasus |
| RIGHT ASCENSION (J2000) | 21h 29m 58.2s |
| DECLINATION (J2000) | +12° 09′ 59.3″ |

## 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 |
| --- | --- |
| Surface magnetic field | 3.84×10⁸ G |
| Spin period | 0.00674339 s |
| Spin-down rate | 2.14×10⁻²⁰ s/s |
| Characteristic age | 5×10⁹ yr |
| Spin-down luminosity | 2.75×10³³ 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) | −0.66 ±0.03 mas/yr |
| Proper motion (Dec) | −3.8 mas/yr |
| Position epoch | J1989.290 |
| Position known to | 6.7 mas |
| Dispersion measure | 67.12 pc/cm³ |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| Associated with | GC:M15(NGC7078),GC:M15\[wpq+24\] |

## Also known as

- ATNF: B2127+11H
- ATNF: J2129+1210H
- ATNF: PSR B2127+11H
- ATNF: PSR J2129+1210H

## 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 J2129+1210H \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/psr-j2129p1210h

```bibtex
@misc{spacecatalog_psr-j2129p1210h,
  author       = {{SpaceCatalog}},
  title        = {{PSR J2129+1210H}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/psr-j2129p1210h},
  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-j2129p1210h