---
title: "HIP 100406"
url: "https://spacecatalog.org/object/hip-100406"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. HIP 100406 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-100406"
---

# HIP 100406

HIP 100406 is an M1 red [star](https://spacecatalog.org/stars) in the constellation [Delphinus](https://spacecatalog.org/constellation/delphinus), shining at apparent magnitude 10.36 (V).

## At a glance

- **WHAT IT IS:** Red star
- **HOW BRIGHT (V):** 10.36 — A small telescope reaches it.
- **WHERE TO LOOK:** [Delphinus](https://spacecatalog.org/constellation/delphinus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | M1 red star |
| APPARENT MAGNITUDE (V) | 10.36 |
| CONSTELLATION | Delphinus |
| RIGHT ASCENSION (J2000) | 20h 21m 38.1s |
| DECLINATION (J2000) | +13° 34′ 57.8″ |

## 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 |
| --- | --- |
| Spectral type | M1 |
| Surface temperature | 4655 K |
| Luminosity (bolometric) | 1759.845 L☉ |
| Radius | 58.98 R☉ |
| Surface gravity (log g) | 1 |

### 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 |
| --- | --- |
| Colour index (B−V) | 1.35 |
| Variable magnitude, brightest | 10.29 |
| Variable magnitude, faintest | 10.46 |

### 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 |
| --- | --- |
| Proper motion (RA) | −3.15 mas/yr |
| Proper motion (Dec) | −1.44 mas/yr |
| Radial velocity | 0 km/s |

### WHERE THESE FIGURES CAME FROM

Which catalogue, paper or model each of the fields above was read from, where the source named one.

| Field | Value |
| --- | --- |
| Stellar parameters from | Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) |

## Also known as

- HIP: HIP 100406

## Source

[HYG Database v4.1](https://github.com/astronexus/HYG-Database) — CC-BY-SA-4.0

The producer asks: HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.

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

## Cite this page

SpaceCatalog. HIP 100406 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-100406

```bibtex
@misc{spacecatalog_hip-100406,
  author       = {{SpaceCatalog}},
  title        = {{HIP 100406}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hip-100406},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}
}
```

HYG Database v4.1 — CC-BY-SA-4.0

Acknowledgement the producer asks for: HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). 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/hip-100406