---
title: "V855 Ara"
url: "https://spacecatalog.org/object/hd-155066"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. V855 Ara [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-155066"
---

# V855 Ara

V855 Ara is an M4III red giant in the constellation [Ara](https://spacecatalog.org/constellation/ara), 1049 ly from Earth, shining at apparent magnitude 7.30 (V). Other catalogues list it as HD 155066 and HIP 84148.

## At a glance

- **WHAT IT IS:** Red giant
- **HOW FAR:** 1049 ly — The light arriving now left it that long ago.
- **HOW BRIGHT (V):** 7.30 — Binoculars reach it; the naked eye does not.
- **WHERE TO LOOK:** [Ara](https://spacecatalog.org/constellation/ara) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | M4III red giant |
| DISTANCE FROM EARTH | 1049 ly — by parallax |
| APPARENT MAGNITUDE (V) | 7.30 |
| ABSOLUTE MAGNITUDE (V) | −0.24 |
| CONSTELLATION | Ara |
| RIGHT ASCENSION (J2000) | 17h 12m 14.6s |
| DECLINATION (J2000) | −53° 22′ 34.0″ |

## 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 | M4III |
| Luminosity (visual) | 108.243 L☉ |
| Variability | Slow irregular giant (late spectral type) |
| Variability type (GCVS) | LB |

### 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) | 1.599 |
| Variable magnitude, brightest | 7.27 |
| Variable magnitude, faintest | 7.37 |

### 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) | −4.21 mas/yr |
| Proper motion (Dec) | −10.46 mas/yr |
| Radial velocity | 0 km/s |

### OTHER NAMES AND NUMBERS

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

| Field | Value |
| --- | --- |
| Variable-star designation | V855 Ara |

### 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 |
| --- | --- |
| Spectral type from | SIMBAD (1975MSS...C01....0H, quality C) |

## Also known as

- HD: HD 155066
- HIP: HIP 84148
- Variable star: V855 Ara

## 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. V855 Ara \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-155066

```bibtex
@misc{spacecatalog_hd-155066,
  author       = {{SpaceCatalog}},
  title        = {{V855 Ara}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-155066},
  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-155066