---
title: "NGC 4557"
url: "https://spacecatalog.org/object/ngc-4557"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. NGC 4557 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-4557"
---

# NGC 4557

NGC 4557 is an unclassified object in the constellation [Coma Berenices](https://spacecatalog.org/constellation/coma-berenices). Other catalogues list it as SDSS J123549.74+270313.6.

## At a glance

- **WHAT IT IS:** Unclassified object
- **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 | Unclassified object |
| CONSTELLATION | Coma Berenices |
| RIGHT ASCENSION (J2000) | 12h 35m 49.7s |
| DECLINATION (J2000) | +27° 03′ 13.6″ |

## 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 | Other |
| Wikidata item | Q1112490 |

## Also known as

- NGC: NGC 4557
- SDSS: SDSS J123549.74+270313.6

## 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 4557 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-4557

```bibtex
@misc{spacecatalog_ngc-4557,
  author       = {{SpaceCatalog}},
  title        = {{NGC 4557}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-4557},
  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-4557