---
title: "HD 187311"
url: "https://spacecatalog.org/object/hd-187311"
release: "DR1"
licence: "CC-BY-SA-4.0"
citation: "SpaceCatalog. HD 187311 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-187311"
---

# HD 187311

HD 187311 is a B5II blue-white bright giant in the constellation [Sagittarius](https://spacecatalog.org/constellation/sagittarius), 1059 ly from Earth, shining at apparent magnitude 10.24 (V). Other catalogues list it as HIP 97680.

## At a glance

- **WHAT IT IS:** Blue-white bright giant
- **HOW FAR:** 1059 ly — The light arriving now left it that long ago.
- **HOW BRIGHT (V):** 10.24 — A small telescope reaches it.
- **WHERE TO LOOK:** [Sagittarius](https://spacecatalog.org/constellation/sagittarius) — The patch of sky it sits in, as seen from Earth.

## Properties

| Quantity | Value |
| --- | --- |
| CLASS | B5II blue-white bright giant |
| MASS | 5.39 M☉ — Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate |
| DISTANCE FROM EARTH | 1059 ly — by parallax |
| APPARENT MAGNITUDE (V) | 10.24 |
| ABSOLUTE MAGNITUDE (V) | 2.68 |
| CONSTELLATION | Sagittarius |
| RIGHT ASCENSION (J2000) | 19h 51m 04.7s |
| DECLINATION (J2000) | −41° 01′ 23.6″ |

## 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 | B5II |
| Surface temperature | 17 147 K |
| Luminosity | 7.35868 L☉ |
| Luminosity (bolometric) | 903.9334 L☉ |
| Radius | 5.419 R☉ |
| Mass | 5.391 M☉ |
| Surface gravity (log g) | 3.762 |

### 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) | −0.146 |
| Variable magnitude, brightest | 10.18 |
| Variable magnitude, faintest | 10.29 |

### 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) | −5.38 mas/yr |
| Proper motion (Dec) | −4.31 mas/yr |
| Radial velocity | −13 km/s |

### 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 (1978MSS...C02....0H, 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 |

## Also known as

- HD: HD 187311
- HIP: HIP 97680

## 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. HD 187311 \[catalogue entry\]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-187311

```bibtex
@misc{spacecatalog_hd-187311,
  author       = {{SpaceCatalog}},
  title        = {{HD 187311}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/hd-187311},
  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-187311