---
title: "NGC 5455"
url: "https://spacecatalog.org/object/ngc-5455"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. NGC 5455 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-5455"
---

# NGC 5455

NGC 5455 is an H II region in the constellation [Ursa Major](https://spacecatalog.org/constellation/ursa-major), shining at apparent magnitude 15.22 (B). Other catalogues list it as IRAS 14012+5428, IRAS F14012+5428 and SDSS J140301.17+541429.3, among 6 designations in total. It was discovered in 1851.

## At a glance

- **WHAT IT IS:** H II region
- **HOW BIG ON THE SKY:** 38″ — Small enough that the full Moon would cover it several times over.
- **HOW BRIGHT (B):** 15.22 — Faint: it takes a large telescope.
- **WHERE TO LOOK:** [Ursa Major](https://spacecatalog.org/constellation/ursa-major) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | H II region |
| APPARENT MAGNITUDE (B) | 15.22 |
| CONSTELLATION | Ursa Major |
| RIGHT ASCENSION (J2000) | 14h 03m 01.2s |
| DECLINATION (J2000) | +54° 14′ 29.3″ |
| DISCOVERED | 1851 |

## 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) | 15.22 |

### 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 |
| --- | --- |
| Major axis | 0.63′ |
| Minor axis | 0.49′ |
| Position angle | 178° |

### WHEN IT WAS FOUND

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

| Field | Value |
| --- | --- |
| Discovered by | William Parsons, 3rd Earl of Rosse |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | HII |
| Wikidata item | Q1119893 |
| Wikipedia article | NGC 5455 |

## Also known as

- IRAS: IRAS 14012+5428
- IRAS: IRAS F14012+5428
- NGC: NGC 5455
- SDSS: SDSS J140301.17+541429.3
- SDSS: SDSS J140301.17+541429.4
- SDSS: SDSS J140301.19+541426.8

## 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 5455 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-5455

```bibtex
@misc{spacecatalog_ngc-5455,
  author       = {{SpaceCatalog}},
  title        = {{NGC 5455}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-5455},
  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-5455