---
title: "IC 4997"
url: "https://spacecatalog.org/object/ic-4997"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. IC 4997 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ic-4997"
---

# IC 4997

IC 4997 is a planetary [nebula](https://spacecatalog.org/nebulae) in the constellation [Sagitta](https://spacecatalog.org/constellation/sagitta), shining at apparent magnitude 10.50 (V). Other catalogues list it as HD 193538, IRAS 20178+1634 and PK 58-10 1, among 6 designations in total.

## At a glance

- **WHAT IT IS:** Planetary nebula
- **HOW BIG ON THE SKY:** 2″ — Small enough that the full Moon would cover it several times over.
- **HOW BRIGHT (V):** 10.50 — A small telescope reaches it.
- **WHERE TO LOOK:** [Sagitta](https://spacecatalog.org/constellation/sagitta) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Planetary nebula |
| APPARENT MAGNITUDE (V) | 10.50 |
| CONSTELLATION | Sagitta |
| RIGHT ASCENSION (J2000) | 20h 20m 08.8s |
| DECLINATION (J2000) | +16° 43′ 54.0″ |

## 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) | 11.60 |
| Apparent magnitude (V) | 10.50 |
| Apparent magnitude (J) | 10.45 |
| Apparent magnitude (H band) | 10.41 |
| Apparent magnitude (K) | 9.67 |

### 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 | −64 km/s |
| Redshift (z) | −0.000215 |
| Major axis | 0.03′ |

### WHEN IT WAS FOUND

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

| Field | Value |
| --- | --- |
| Discovered by | Williamina Fleming |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | PN |
| Wikidata item | Q1639920 |
| Wikipedia article | IC 4997 |

## Also known as

- HD: HD 193538
- IC: IC 4997
- IRAS: IRAS 20178+1634
- PK: PK 58-10 1
- PN: PN G058.3-10.9
- TYC: TYC 1631-1785-1

## 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 4997 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ic-4997

```bibtex
@misc{spacecatalog_ic-4997,
  author       = {{SpaceCatalog}},
  title        = {{IC 4997}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ic-4997},
  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-4997