---
title: "V742 Cas"
url: "https://spacecatalog.org/object/hd-698"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. V742 Cas [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-698"
---

# V742 Cas

V742 Cas is a B7:Ib-II(e) blue-white supergiant in the constellation [Cassiopeia](https://spacecatalog.org/constellation/cassiopeia), shining at apparent magnitude 7.09 (V). Other catalogues list it as HD 698 and HIP 940.

## At a glance

- **WHAT IT IS:** Blue-white supergiant
- **HOW BRIGHT (V):** 7.09 — Binoculars reach it; the naked eye does not.
- **WHERE TO LOOK:** [Cassiopeia](https://spacecatalog.org/constellation/cassiopeia) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | B7:Ib-II(e) blue-white supergiant |
| APPARENT MAGNITUDE (V) | 7.09 |
| CONSTELLATION | Cassiopeia |
| RIGHT ASCENSION (J2000) | 00h 11m 37.1s |
| DECLINATION (J2000) | +58° 12′ 42.6″ |

## 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 | B7:Ib-II(e) |
| Variability | Be star with irregular variability |
| Variability type (GCVS) | BE |

### 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) | 0.137 |
| Variable magnitude, brightest | 7.06 |
| Variable magnitude, faintest | 7.12 |

### 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) | 0.25 mas/yr |
| Proper motion (Dec) | −2.49 mas/yr |
| Radial velocity | −25.6 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 | V742 Cas |
| Washington Double Star id | 00116+5813 |

### 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 (1978PASP...90..179H, quality C) |

## Also known as

- HD: HD 698
- HIP: HIP 940
- Variable star: V742 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. V742 Cas \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-698

```bibtex
@misc{spacecatalog_hd-698,
  author       = {{SpaceCatalog}},
  title        = {{V742 Cas}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-698},
  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-698