---
title: "NGC 1751"
url: "https://spacecatalog.org/object/ngc-1751"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. NGC 1751 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-1751"
---

# NGC 1751

NGC 1751 is a globular [cluster](https://spacecatalog.org/clusters) in the constellation [Mensa](https://spacecatalog.org/constellation/mensa), shining at apparent magnitude 11.73 (V). Other catalogues list it as 2MASX J04541252-6948211, ESO 056-023 and ESO 56-23. It was discovered in 1826.

## At a glance

- **WHAT IT IS:** Globular cluster
- **HOW BIG ON THE SKY:** 1.6′ — Small enough that the full Moon would cover it several times over.
- **HOW BRIGHT (V):** 11.73 — A small telescope reaches it.
- **WHERE TO LOOK:** [Mensa](https://spacecatalog.org/constellation/mensa) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Globular cluster |
| APPARENT MAGNITUDE (V) | 11.73 |
| CONSTELLATION | Mensa |
| RIGHT ASCENSION (J2000) | 04h 54m 12.6s |
| DECLINATION (J2000) | −69° 48′ 21.0″ |
| DISCOVERED | 1826 |

## Catalogue data

### 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 |
| --- | --- |
| Apparent magnitude (B) | 15.06 |
| Apparent magnitude (V) | 11.73 |

### 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 |
| --- | --- |
| Radial velocity | 245 km/s |
| Redshift (z) | 0.000819 |
| Major axis | 1.6′ |
| Minor axis | 1.5′ |
| Position angle | 60° |

### WHEN IT WAS FOUND

Who first saw it, from where, and by what method.

| Field | Value |
| --- | --- |
| Discovered by | James Dunlop |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | GCl |
| Wikidata item | Q1045110 |

## Also known as

- 2MASX: 2MASX J04541252-6948211
- ESO: ESO 056-023
- ESO: ESO 56-23
- NGC: NGC 1751

## Source

[OpenNGC](https://github.com/mattiaverga/OpenNGC) — CC-BY-SA-4.0

The producer asks: OpenNGC, Mattia Verga (github.com/mattiaverga/OpenNGC). Fields derived from it stay under CC BY-SA 4.0.

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

## Cite this page

SpaceCatalog. NGC 1751 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-1751

```bibtex
@misc{spacecatalog_ngc-1751,
  author       = {{SpaceCatalog}},
  title        = {{NGC 1751}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-1751},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from OpenNGC.}
}
```

OpenNGC — CC-BY-SA-4.0

Acknowledgement the producer asks for: OpenNGC, Mattia Verga (github.com/mattiaverga/OpenNGC). Fields derived from it stay under CC BY-SA 4.0.

The page itself, with its pictures, the sky map and the observing tools: https://spacecatalog.org/object/ngc-1751