NGC 358 is an asterism of four stars in the constellation of Cassiopeia. Two of the members were found to have a similar distance of roughly 1700 light years with

Hipparcos ''Hipparcos'' was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial obj ...

data, although the other two did not have well-constrained distances, so its exact nature was uncertain. Gaia DR3 data shows that the two members TYC 4021-519-1 and TYC 4021-575-1 are not associated due to their very different

proper motion Proper motion is the astrometric measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more dista ...

and

radial velocity The radial velocity or line-of-sight velocity, also known as radial speed or range rate, of a target with respect to an observer is the temporal rate of change, rate of change of the distance or Slant range, range between the two points. It is e ...

. The distance remains remarkable similar for both stars from the Gaia

parallax Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects ...

. The other two stars have larger distances. The asterism was discovered on February 4, 1865 by the German-Danish astronomer

Heinrich Louis d'Arrest Heinrich Louis d'Arrest (13 August 1822 – 14 June 1875; ) was a German astronomer, born in Berlin. His name is sometimes given as Heinrich Ludwig d'Arrest. Biography While still a student at the University of Berlin, d'Arrest was pa ...

Individual Objects

References

External links

DSS Images for NGC 300 through NGC 399

SEDS

VizieR-Katalog

VizieR Umgebungssuche
{{Cassiopeia (constellation) 0358 Cassiopeia (constellation) 18650604