---
title: "V961 Cen"
url: "https://spacecatalog.org/object/hd-115071"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. V961 Cen [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-115071"
---

# V961 Cen

V961 Cen is an O9.5III+B0Ib blue giant in the constellation [Centaurus](https://spacecatalog.org/constellation/centaurus), shining at apparent magnitude 7.95 (V). Other catalogues list it as HD 115071 and HIP 64737.

## At a glance

- **WHAT IT IS:** Blue giant
- **HOW BRIGHT (V):** 7.95 — 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 | O9.5III+B0Ib blue giant |
| APPARENT MAGNITUDE (V) | 7.95 |
| CONSTELLATION | Centaurus |
| RIGHT ASCENSION (J2000) | 13h 16m 04.8s |
| DECLINATION (J2000) | −62° 35′ 01.5″ |

## 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 | O9.5III+B0Ib |
| Surface temperature | 6784 K |
| Radius | 38.718 R☉ |
| Surface gravity (log g) | 2.033 |
| Variability | Ellipsoidal rotating variable |
| Variability type (GCVS) | ELL |
| Variability period | 2.73132 days |
| Reference epoch (HJD) | 2452892.8350 |

### 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) | 0.226 |
| Variable magnitude, brightest | 7.90 |
| Variable magnitude, faintest | 8.00 |

### 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) | −3.46 mas/yr |
| Proper motion (Dec) | −1.14 mas/yr |
| Radial velocity | −9.5 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 | V961 Cen |

### 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 (2014ApJS..211...10S, quality C) |
| Stellar parameters from | Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) |

## Also known as

- HD: HD 115071
- HIP: HIP 64737
- Variable star: V961 Cen

## 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. V961 Cen \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-115071

```bibtex
@misc{spacecatalog_hd-115071,
  author       = {{SpaceCatalog}},
  title        = {{V961 Cen}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-115071},
  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-115071