Andromeda
Log inJoin

Brown dwarf

WISE 1639-6847

Also WISE J163940.86-684744.6

Open in Ouranos

A brown dwarf — too light to shine like a star — one of the Sun's neighbours within 20 light-years.

Measured

Distance
15 light-years
Constellation
Triangulum Australe
Position (J2000)
RA 16h 39m 41s, Dec −68.80°

How far, from the Sun

14.8 light-years. To cross it:

  • Light14.9 years
  • Voyager 1's speed264,000 years
  • Driving at 100 km/h160 million years

Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.

Facts

  • It is a Y dwarf, one of the coldest classes of brown dwarf, at roughly 360–400 K, about the temperature of boiling water.
  • Spectral type Y0pec (SIMBAD).

Where this comes from

  • Parallax 219.6 ± 2.3 mas (Kirkpatrick et al. 2021, ApJS 253, 7 — the 20-pc census of L, T and Y dwarfs)
  • This research has made use of the SIMBAD database, CDS, Strasbourg, France (Wenger et al. 2000, A&AS 143, 9).
  • This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier).

Every catalogue Ouranos draws is credited on the credits page.