NGC 7790

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
See also: Open cluster, List of open clusters

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]

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]

References

External links

• Media related to NGC 7790 at Wikimedia Commons
• NGC 7790 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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