---
title: "UGC 9821"
url: "https://spacecatalog.org/object/ugc-9821"
release: "DR1"
licence: "VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)"
citation: "SpaceCatalog. UGC 9821 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ugc-9821"
---

# UGC 9821

UGC 9821 is a [galaxy](https://spacecatalog.org/galaxies) in the constellation [Serpens](https://spacecatalog.org/constellation/serpens), 573.3 Mly from Earth, shining at apparent magnitude 15.17 (B). Other catalogues list it as 2MASX 15214033+0824559 and WISExSCOS J152140.30+082456.7.

## At a glance

- **WHAT IT IS:** Galaxy
- **HOW FAR:** 573.3 Mly — A luminosity distance, from its redshift — how faint it looks. The light itself left 526 million years ago.
- **HOW BRIGHT (B):** 15.17 — Faint: it takes a large telescope.
- **WHERE TO LOOK:** [Serpens](https://spacecatalog.org/constellation/serpens) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Galaxy |
| DISTANCE FROM EARTH | 573.3 Mly ±30 — by luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc |
| APPARENT MAGNITUDE (B) | 15.17 |
| ABSOLUTE MAGNITUDE (B) | −21.06 |
| CONSTELLATION | Serpens |
| RIGHT ASCENSION (J2000) | 15h 21m 40.3s |
| DECLINATION (J2000) | +08° 24′ 55.9″ |

## 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 |
| --- | --- |
| Stellar mass | 1.87×10¹⁰ ±9.3×10⁹ M☉ |

### 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) | 15.17 |
| Apparent magnitude (J) | 12.60 |
| Apparent magnitude (H band) | 11.91 |
| Apparent magnitude (K) | 11.55 |

### 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 |
| --- | --- |
| Redshift (z) | 0.03876 |
| Redshift (z, CMB frame) | 0.0398486 |

## Also known as

- 2MASX: 2MASX 15214033+0824559
- WISExSCOS: WISExSCOS J152140.30+082456.7

## Source

[GLADE+ (Galaxy List for the Advanced Detector Era)](https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/291) — VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)

The producer asks: Dálya et al. 2022, MNRAS 514, 1403 (2022MNRAS.514.1403D) — "Please cite this paper when using GLADE+ data" — via VizieR VII/291. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier). The original description of the VizieR service was published in 2000, A&AS 143, 23.

How this was made: https://spacecatalog.org/methods#source-glade-plus

## Cite this page

SpaceCatalog. UGC 9821 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ugc-9821

```bibtex
@misc{spacecatalog_ugc-9821,
  author       = {{SpaceCatalog}},
  title        = {{UGC 9821}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ugc-9821},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from GLADE+ (Galaxy List for the Advanced Detector Era).}
}
```

GLADE+ (Galaxy List for the Advanced Detector Era) — VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)

Acknowledgement the producer asks for: Dálya et al. 2022, MNRAS 514, 1403 (2022MNRAS.514.1403D) — "Please cite this paper when using GLADE+ data" — via VizieR VII/291. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier). The original description of the VizieR service was published in 2000, A&AS 143, 23.

The page itself, with its pictures, the sky map and the observing tools: https://spacecatalog.org/object/ugc-9821