---
title: "Seyfert's Sextet"
url: "https://spacecatalog.org/object/hcg079"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. Seyfert's Sextet [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hcg079"
---

# Seyfert's Sextet

Seyfert's Sextet is a group of [galaxies](https://spacecatalog.org/galaxies) in the constellation [Serpens](https://spacecatalog.org/constellation/serpens), 206.3 Mly from Earth. Other catalogues list it as IRAS 15570+2053 and HCG079.

## At a glance

- **WHAT IT IS:** Group of galaxies
- **HOW FAR:** 206.3 Mly — A luminosity distance, from its redshift — how faint it looks. The light itself left 198 million years ago.
- **HOW BIG ON THE SKY:** 2.8′ — Small enough that the full Moon would cover it several times over.
- **WHERE TO LOOK:** [Serpens](https://spacecatalog.org/constellation/serpens) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Group of galaxies |
| DISTANCE FROM EARTH | 206.3 Mly ±16 — by redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc |
| CONSTELLATION | Serpens |
| RIGHT ASCENSION (J2000) | 15h 59m 11.9s |
| DECLINATION (J2000) | +20° 45′ 31.0″ |

## Catalogue data

### 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 | 4256 km/s |
| Redshift (z) | 0.0143 |
| Redshift (z, CMB frame) | 0.014608 |
| Major axis | 2.8′ |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | GGroup |

## Also known as

- Common name: Seyfert's Sextet
- IRAS: IRAS 15570+2053
- OpenNGC: HCG079

## 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. Seyfert's Sextet \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hcg079

```bibtex
@misc{spacecatalog_hcg079,
  author       = {{SpaceCatalog}},
  title        = {{Seyfert's Sextet}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hcg079},
  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/hcg079