---
title: "PGC 166101"
url: "https://spacecatalog.org/object/pgc-166101"
release: "DR1"
licence: "VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)"
citation: "SpaceCatalog. PGC 166101 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/pgc-166101"
---

# PGC 166101

PGC 166101 is a [galaxy](https://spacecatalog.org/galaxies) in the constellation [Ursa Major](https://spacecatalog.org/constellation/ursa-major), shining at apparent magnitude 15.58 (B).

## At a glance

- **WHAT IT IS:** Galaxy
- **HOW BIG ON THE SKY:** 1.8′ — Small enough that the full Moon would cover it several times over.
- **HOW BRIGHT (B):** 15.58 — Faint: it takes a large telescope.
- **WHERE TO LOOK:** [Ursa Major](https://spacecatalog.org/constellation/ursa-major) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | Galaxy |
| APPARENT MAGNITUDE (B) | 15.58 |
| CONSTELLATION | Ursa Major |
| RIGHT ASCENSION (J2000) | 09h 50m 16.8s |
| DECLINATION (J2000) | +67° 30′ 40.0″ |

## 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) | 15.58 |

### 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) | 0.00077637 |
| Redshift (z, CMB frame) | 0.00144272 |
| Major axis | 1.817′ |
| Minor axis | 1.817′ |
| Position angle | 0° |

## Also known as

- PGC: PGC 166101

## 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. PGC 166101 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/pgc-166101

```bibtex
@misc{spacecatalog_pgc-166101,
  author       = {{SpaceCatalog}},
  title        = {{PGC 166101}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/pgc-166101},
  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/pgc-166101