Overview

Ross 248 (variable star name HH Andromedae; catalogued also as Gliese 905) is a nearby red dwarf located in the direction of the northern constellation Andromeda. At roughly 10.30 light-years (about 3.16 parsecs—see parsec) from Earth, it ranks among the Sun's closer stellar neighbors. Despite this proximity, Ross 248 is intrinsically faint and cannot be seen with the unaided eye.

Physical characteristics

Ross 248 is a low-mass, cool star of the red-dwarf class (red dwarf) and belongs to the family of flare stars known as UV Ceti types (UV Ceti variable). Such stars have convective envelopes and strong magnetic activity that can produce sudden, brief increases in brightness. Its small size and low luminosity make it a useful example for studying the physics of very low-mass stellar objects and stellar magnetism.

Motion and historical notes

The star was first listed by astronomer Frank Elmore Ross in 1926 in his survey of high proper-motion stars; its common name reflects that cataloguing. Ross 248 exhibits a significant proper motion across the sky, which helped reveal its relative proximity. Precise astrometric measurements, including parallax, established its distance and motion relative to the Sun.

Scientific interest and searches

As one of the nearby M-type dwarfs, Ross 248 is of interest for studies of stellar activity, atmospheric composition, and as a target in searches for planets around low-mass stars. Instruments that probe nearby stars for radial-velocity signals and transits have included this object among their targets, though it remains primarily notable for its stellar behaviour rather than any confirmed planetary system.

Notable facts and context

  • Variable star designation: HH Andromedae, reflecting its flare activity and monitored brightness variations.
  • Catalogue identifiers and resources: see typical star catalogs and databases via a catalog entry or a nearby-star list reference.
  • Future relative motion: over the next several tens of thousands of years Ross 248 is predicted to move closer in relation to the Sun and, for a time, become one of the nearest stars to the Solar System.

For concise reference material and observational data, consult stellar catalogs and nearby-star compilations (catalog, observational notes). Educational summaries about parsecs and stellar types can provide background (parsec, flare stars, red dwarfs). Additional image or observation guides are available through astronomy outreach resources covering Andromeda and specialized databases for nearby stars.