NGC 7790
Open star cluster in the constellation Cassiopeia
From Wikipedia, the free encyclopedia
NGC 7790 is a young open cluster[1] of stars located some 10,800[2] light years away from Earth in the northern constellation of Cassiopeia. At this distance, the light from the cluster has undergone extinction from interstellar gas and dust equal to E(B – V ) = 0.51 magnitude in the UBV photometric system. NGC 7790 has a Trumpler class rating of II2m[2] and the estimated age is 60–80 million years.[3] It contains three cepheid variables: CEa Cas, CEb Cas, and CF Cas.[2]
| NGC 7790 | |
|---|---|
NGC 7790 (taken from Stellarium) Credit: Roberto Mura | |
| Observation data (J2000.0 epoch) | |
| Right ascension | 23h 58m 24.2s[1] |
| Declination | +61° 12′ 30″[1] |
| Distance | 10.76 ± 0.75 kly (3.30 ± 0.23 kpc)[2] |
| Apparent magnitude (V) | 8.5 |
| Apparent dimensions (V) | 7′.4[2] diameter |
| Physical characteristics | |
| Estimated age | 60–80[3] Myr |
| Other designations | Cr 461 |
| Associations | |
| Constellation | Cassiopeia |
This cluster is on an orbit through the Milky Way galaxy that has an eccentricity of 0.22 ± 0.07 and a period of (225.0 ± 27.1) million years. It will come as close as 20.2 ± 3.9 kly (6.2 ± 1.2 kpc) to, and as distant as 31.6 ± 2.9 kly (9.7 ± 0.9 kpc) from, the Galactic Center. The maximum distance reached above (or below) the galactic plane is 0.78 ± 1.30 kly (0.24 ± 0.40 kpc). On average, it will cross the galactic plane every (35.7 ± 13.0) million years.[4]
