---
title: "HD 101581"
url: "https://spacecatalog.org/object/hd-101581"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. HD 101581 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-101581"
---

# HD 101581

HD 101581 is a K5V orange dwarf in the constellation [Centaurus](https://spacecatalog.org/constellation/centaurus), 40.45 ly from Earth, shining at apparent magnitude 7.77 (V). Other catalogues list it as Gl 435 and HIP 56998.

## At a glance

- **WHAT IT IS:** Orange dwarf
- **HOW FAR:** 40.45 ly — The light arriving now left it that long ago.
- **HOW BRIGHT (V):** 7.77 — Binoculars reach it; the naked eye does not.
- **WHERE TO LOOK:** [Centaurus](https://spacecatalog.org/constellation/centaurus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | K5V orange dwarf |
| DISTANCE FROM EARTH | 40.45 ly — by parallax |
| APPARENT MAGNITUDE (V) | 7.77 |
| ABSOLUTE MAGNITUDE (V) | 7.30 |
| CONSTELLATION | Centaurus |
| RIGHT ASCENSION (J2000) | 11h 41m 02.6s |
| DECLINATION (J2000) | −44° 24′ 18.7″ |

## 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 | K5V |
| Surface temperature | 4600 K |
| Luminosity | 0.104424 L☉ |
| Surface gravity (log g) | 4.63 |
| Metallicity (\[Fe/H\]) | −0.52 ±0.088 |

### 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) | 1.064 |

### 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) | −658 mas/yr |
| Proper motion (Dec) | 242.8 mas/yr |
| Radial velocity | 13.3 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 | Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016) |
| Metallicity from | Median of 6 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them |

## Also known as

- Gliese: Gl 435
- HD: HD 101581
- HIP: HIP 56998

## 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. HD 101581 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-101581

```bibtex
@misc{spacecatalog_hd-101581,
  author       = {{SpaceCatalog}},
  title        = {{HD 101581}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-101581},
  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/hd-101581