---
title: "BD Cas"
url: "https://spacecatalog.org/object/hip-796"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. BD Cas [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-796"
---

# BD Cas

BD Cas is a [star](https://spacecatalog.org/stars) in the constellation [Cassiopeia](https://spacecatalog.org/constellation/cassiopeia), 1531 ly from Earth, shining at apparent magnitude 11.18 (V). Other catalogues list it as HIP 796.

## At a glance

- **WHAT IT IS:** Star
- **HOW FAR:** 1531 ly — The light arriving now left it that long ago.
- **HOW BRIGHT (V):** 11.18 — A small telescope reaches it.
- **WHERE TO LOOK:** [Cassiopeia](https://spacecatalog.org/constellation/cassiopeia) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| DISTANCE FROM EARTH | 1531 ly — by parallax |
| APPARENT MAGNITUDE (V) | 11.18 |
| ABSOLUTE MAGNITUDE (V) | 2.82 |
| CONSTELLATION | Cassiopeia |
| RIGHT ASCENSION (J2000) | 00h 09m 51.4s |
| DECLINATION (J2000) | +61° 30′ 50.5″ |

## 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 |
| --- | --- |
| Luminosity (visual) | 6.47441 L☉ |
| Variability | W Virginis Cepheid (period under 8 days) |
| Variability type (GCVS) | CWB: |
| Variability period | 3.6516 days |
| Reference epoch (HJD) | 2448503.2590 |

### 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 |
| --- | --- |
| Variable magnitude, brightest | 10.93 |
| Variable magnitude, faintest | 11.30 |

### 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) | −1.91 mas/yr |
| Proper motion (Dec) | −1.87 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 | BD Cas |

## Also known as

- HIP: HIP 796
- Variable star: BD Cas

## 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. BD Cas \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hip-796

```bibtex
@misc{spacecatalog_hip-796,
  author       = {{SpaceCatalog}},
  title        = {{BD Cas}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hip-796},
  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-796