---
title: "NGC 4559C"
url: "https://spacecatalog.org/object/ngc-4559c"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. NGC 4559C [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-4559c"
---

# NGC 4559C

NGC 4559C is an H II region in the constellation [Coma Berenices](https://spacecatalog.org/constellation/coma-berenices). Other catalogues list it as IC 3550.

## At a glance

- **WHAT IT IS:** H II region
- **WHERE TO LOOK:** [Coma Berenices](https://spacecatalog.org/constellation/coma-berenices) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | H II region |
| CONSTELLATION | Coma Berenices |
| RIGHT ASCENSION (J2000) | 12h 35m 52.1s |
| DECLINATION (J2000) | +27° 55′ 55.5″ |

## Catalogue data

### 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 |

## Also known as

- IC: IC 3550
- NGC: NGC 4559C

## 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 4559C \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-4559c

```bibtex
@misc{spacecatalog_ngc-4559c,
  author       = {{SpaceCatalog}},
  title        = {{NGC 4559C}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-4559c},
  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-4559c