---
title: "NGC 3339"
url: "https://spacecatalog.org/object/ngc-3339"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. NGC 3339 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-3339"
---

# NGC 3339

NGC 3339 is a [star](https://spacecatalog.org/stars) in the constellation [Sextans](https://spacecatalog.org/constellation/sextans), shining at apparent magnitude 15.40 (B). Other catalogues list it as 2MASS J10421006-0022093 and SDSS J104210.05-002209.3.

## At a glance

- **WHAT IT IS:** Star
- **HOW BRIGHT (B):** 15.40 — Faint: it takes a large telescope.
- **WHERE TO LOOK:** [Sextans](https://spacecatalog.org/constellation/sextans) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Star |
| APPARENT MAGNITUDE (B) | 15.40 |
| CONSTELLATION | Sextans |
| RIGHT ASCENSION (J2000) | 10h 42m 10.1s |
| DECLINATION (J2000) | −00° 22′ 09.3″ |

## 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) | 15.40 |
| Apparent magnitude (J) | 14.09 |
| Apparent magnitude (H band) | 13.77 |
| Apparent magnitude (K) | 13.79 |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| OpenNGC type code | \* |
| Wikidata item | Q965629 |

## Also known as

- 2MASS: 2MASS J10421006-0022093
- NGC: NGC 3339
- SDSS: SDSS J104210.05-002209.3

## 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 3339 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-3339

```bibtex
@misc{spacecatalog_ngc-3339,
  author       = {{SpaceCatalog}},
  title        = {{NGC 3339}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-3339},
  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-3339