---
title: "V448 Cyg"
url: "https://spacecatalog.org/object/hd-190967"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. V448 Cyg [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-190967"
---

# V448 Cyg

V448 Cyg is an O9.5V+B1Ib blue main-sequence [star](https://spacecatalog.org/stars) in the constellation [Cygnus](https://spacecatalog.org/constellation/cygnus), 3136 ly from Earth, shining at apparent magnitude 8.16 (V). Other catalogues list it as HD 190967 and HIP 99021.

## At a glance

- **WHAT IT IS:** Blue main-sequence star
- **HOW FAR:** 3136 ly — The light arriving now left it that long ago.
- **HOW BRIGHT (V):** 8.16 — Binoculars reach it; the naked eye does not.
- **WHERE TO LOOK:** [Cygnus](https://spacecatalog.org/constellation/cygnus) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | O9.5V+B1Ib blue main-sequence star |
| DISTANCE FROM EARTH | 3136 ly — by parallax |
| APPARENT MAGNITUDE (V) | 8.16 |
| ABSOLUTE MAGNITUDE (V) | −1.75 |
| CONSTELLATION | Cygnus |
| RIGHT ASCENSION (J2000) | 20h 06m 09.9s |
| DECLINATION (J2000) | +35° 23′ 09.6″ |

## 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 | O9.5V+B1Ib |
| Surface temperature | 20 146 K |
| Luminosity | 438.531 L☉ |
| Radius | 16.505 R☉ |
| Surface gravity (log g) | 3.123 |
| Variability | Beta Lyrae-type eclipsing binary |
| Variability type (GCVS) | EB/SD |
| Variability period | 6.5197162 days |
| Reference epoch (HJD) | 2416361.1070 |

### 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) | 0.324 |
| Variable magnitude, brightest | 7.99 |
| Variable magnitude, faintest | 8.62 |

### 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) | −3.74 mas/yr |
| Proper motion (Dec) | −7.25 mas/yr |
| Radial velocity | −16.1 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 | V448 Cyg |
| Washington Double Star id | 20062+3523 |

### 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 (2015A&A...573A.107H, quality C) |
| Stellar parameters from | Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate; Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star |

## Also known as

- HD: HD 190967
- HIP: HIP 99021
- Variable star: V448 Cyg

## 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. V448 Cyg \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-190967

```bibtex
@misc{spacecatalog_hd-190967,
  author       = {{SpaceCatalog}},
  title        = {{V448 Cyg}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-190967},
  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-190967