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]
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^Cite error: The named reference MNRAS399_4_2146 was invoked but never defined (see the help page).
NGC7790 is a young open cluster of stars located some 10,800 light years away from Earth in the northern constellation of Cassiopeia. At this distance...
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