---
title: "IC 3687"
url: "https://spacecatalog.org/object/ic-3687"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. IC 3687 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ic-3687"
---

# IC 3687

IC 3687 is an irregular [galaxy](https://spacecatalog.org/galaxies) IAB in the constellation [Canes Venatici](https://spacecatalog.org/constellation/canes-venatici), shining at apparent magnitude 13.35 (V). Other catalogues list it as LEDA 42656, MCG +07-26-039 and PGC 42656, among 5 designations in total. It was discovered in 1903.

## At a glance

- **WHAT IT IS:** Irregular galaxy
- **HOW BIG ON THE SKY:** 3.3′ — Small enough that the full Moon would cover it several times over.
- **HOW BRIGHT (V):** 13.35 — Faint: it takes a large telescope.
- **WHERE TO LOOK:** [Canes Venatici](https://spacecatalog.org/constellation/canes-venatici) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Irregular galaxy IAB |
| APPARENT MAGNITUDE (V) | 13.35 |
| CONSTELLATION | Canes Venatici |
| RIGHT ASCENSION (J2000) | 12h 42m 15.1s |
| DECLINATION (J2000) | +38° 30′ 12.0″ |
| DISCOVERED | 1903 |

## Catalogue data

### WHAT KIND OF THING IT IS

What the object is in itself, rather than how it happens to look from here.

| Field | Value |
| --- | --- |
| Hubble type | IAB |

### 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) | 13.75 |
| Apparent magnitude (V) | 13.35 |
| Surface brightness | 25.04 mag/arcsec² |

### 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 | 359 km/s |
| Redshift (z) | 0.001197 |
| Redshift (z, CMB frame) | 0.00198966 |
| Major axis | 3.34′ |
| Minor axis | 3.08′ |
| Position angle | 0° |

### WHEN IT WAS FOUND

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

| Field | Value |
| --- | --- |
| Discovered by | Max Wolf |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | G |
| Wikidata item | Q3679351 |

## Also known as

- IC: IC 3687
- LEDA: LEDA 42656
- MCG: MCG +07-26-039
- PGC: PGC 42656
- UGC: UGC 7866

## 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. IC 3687 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ic-3687

```bibtex
@misc{spacecatalog_ic-3687,
  author       = {{SpaceCatalog}},
  title        = {{IC 3687}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ic-3687},
  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/ic-3687