NGC 7790

{{Short description|Open star cluster in the constellation Cassiopeia}}

{{Infobox cluster

| name = NGC 7790

| image = NGC_7790.png

| caption = NGC 7790 (taken from Stellarium)

| credit = Roberto Mura

| epoch = J2000.0

| constellation = Cassiopeia

| ra = {{RA|23|58|24.2}}

| dec = {{DEC|+61|12|30}}

| dist_ly = {{Convert|3.30|+/-|0.23|kpc|kly|abbr=on|disp=flip}}

| appmag_v = 8.5

| size_v = 7′.4 diameter

| mass_kg =

| mass_msol =

| radius_ly =

| v_hb =

| age = {{nowrap|60–80 Myr}}

| notes =

| names = Cr 461

}}

NGC 7790 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, 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 and the estimated age is 60–80 million years. It contains three cepheid variables: CEa Cas, CEb Cas, and CF Cas.

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 {{Convert|6.2|+/-|1.2|kpc|kly|abbr=on|disp=flip}} to, and as distant as {{Convert|9.7|+/-|0.9|kpc|kly|abbr=on|disp=flip}} from, the Galactic Center. The maximum distance reached above (or below) the galactic plane is {{Convert|0.24|+/-|0.40|kpc|kly|abbr=on|disp=flip}}. On average, it will cross the galactic plane every (35.7 ± 13.0) million years.

References

{{Reflist|refs=

{{citation

|title = Revised New General Catalogue and Index Catalogue

|publisher = olfgang Steinicke

|date = February 2009

|url = http://www.klima-luft.de/steinicke/ngcic/rev2000/NI2009.zip

|access-date = 2013-07-01

|postscript = .

}}{{dead link|date=February 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

{{Citation

| last1 = Gupta | first1 = A. C.

| last2 = Subramaniam | first2 = A.

| last3 = Sagar | first3 = R.

| last4 = Griffiths | first4 = W. K.

| display-authors = 1

| title = A complete photometric study of the open cluster NGC 7790 containing Cepheid variables

| journal = Astronomy and Astrophysics Supplement

| volume = 145

| issue = 3

| pages = 365–375

|date=September 2000

| bibcode = 2000A&AS..145..365G

| doi = 10.1051/aas:2000247

| postscript = .

| doi-access = free

}}

{{Citation

| last1 = Wu | first1 = Zhen-Yu

| last2 = Zhou | first2 = Xu

| last3 = Ma | first3 = Jun

| last4 = Du | first4 = Cui-Hua

| display-authors = 1

| title = The orbits of open clusters in the Galaxy

| journal = Monthly Notices of the Royal Astronomical Society

| volume = 399

| issue = 4

| pages = 2146–2164

|date=November 2009

| arxiv = 0909.3737

| bibcode = 2009MNRAS.399.2146W

| doi = 10.1111/j.1365-2966.2009.15416.x

| doi-access = free

| s2cid = 6066790

| postscript = .

}}

{{Citation

| last1 = Davidge | first1 = T. J.

| title = The Young Open Clusters King 12, NGC 7788, and NGC 7790: Pre-main-sequence Stars and Extended Stellar Halos

| journal = The Astrophysical Journal

| volume = 761

| issue = 2

| page = 155

|date=December 2012

| arxiv = 1211.6398

| bibcode = 2012ApJ...761..155D

| doi = 10.1088/0004-637X/761/2/155

| s2cid = 119205384

| postscript = .

}}

External links

{{commons category-inline}}
{{Sky-Map.org}}

File:NGC 7790 map.png

7790

Category:Open clusters

Category:Cassiopeia (constellation)