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 data, although the other two did not have well-constrained distances, so its exact nature was uncertain.
| NGC 358 | |
|---|---|
 NGC 358 with PanSTARRS | |
| Observation data (J2000.0 epoch) | |
| Right ascension | 01h 05m 11.00s[1] |
| Declination | +62° 01′ 18.0″[1] |
| Distance | 1700 ± 300 |
| Apparent dimensions (V) | 2.5′[2] |
| Physical characteristics | |
| Associations | |
| Constellation | Cassiopeia |
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 and radial velocity. The distance remains remarkable similar for both stars from the Gaia parallax. The other two stars have larger distances.[3]
The asterism was discovered on February 4, 1865, by the German-Danish astronomer Heinrich Louis d'Arrest.[4]
Individual Objects
| Component | Right Ascension | Declination | Distance (parsec) | Brightness | Reference |
|---|---|---|---|---|---|
| TYC 4021-519-1 | 01h 05m 03.5s | +62° 01′ 41.4″ | 537 ± 5 | 11.2 | |
| TYC 4021-575-1 CMC 600551 | 01h 05m 15.4s | +62° 01′ 37.1″ | 544 ± 4 | 11.8 | Gaia DR3 |
| TYC 4021-649-1 | 01h 05m 05.7s | +62° 00′ 54.5″ | 947 ± 14 | 11.6 | Gaia DR3 |
| USNO-A2.0 1500-01120974 | 01h 05m 19s | +62° 00′ 57″ | 3238+144 −131 | 12.5 | Gaia DR3 |