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NGC 5694

{{Short description|Globular cluster in the constellation Hydra}}

{{Infobox globular cluster

| name = NGC 5694

| image = 250px

| caption = The core of NGC 5694 imaged by the Hubble Space Telescope

| epoch = J2000

| class = VII

| constellation = Hydra

| ra = {{RA|14|39|36.5}}{{cite simbad

| title=NGC 5694

| access-date=2010-12-07}}

| dec = {{DEC|-26|32|18.0}}

| dist_ly = 114,100ly

| appmag_v = 10.2{{cite web

| work = SEDS NGC Catalog Online

| title = Results for NGC 5694

| url = http://spider.seds.org/ngc/ngc.cgi?N5694

| access-date = 2010-12-07}}

| size_v = 3.6{{prime}}

| mass_kg =

| mass_msol =

| radius_ly =

| v_hb =

| metal_fe = –1.74

| age = 13.44 Gyr

| notes =

| names = Caldwell 66

}}

NGC 5694 (also known as Caldwell 66) is a globular cluster in the constellation Hydra. It was discovered in 1784 by William Herschel.

Characteristics

This globular cluster is located at a distance of {{convert|114000|ly|pc}} from the Sun and {{convert|96000|ly|pc}} from the Galactic Center{{cite journal| author = Harris, W.E.| year = 1996| title = A Catalog of Parameters for Globular Clusters in the Milky Way| journal = The Astronomical Journal| volume = 112| pages = 1487| url = http://physwww.physics.mcmaster.ca/%7Eharris/mwgc.dat| doi = 10.1086/118116| bibcode=1996AJ....112.1487H| url-access = subscription}} and is one of the oldest known globular clusters in the Milky Way Galaxy, forming nearly 12 billion years ago.{{cite web

|title = NGC/IC Project

|work = Results for NGC 5694

|url = http://www.ngcicproject.org/ngcicdb.asp

|access-date = 2010-12-07

|url-status = dead

|archive-url = https://web.archive.org/web/20120520010558/http://www.ngcicproject.org/ngcicdb.asp

|archive-date = 2012-05-20

}}

Its chemical composition is highly peculiar, being highly (to nearly solar levels) enriched in alpha elements, suggesting an extragalactic origin before being captured by the Milky Way.{{citation|arxiv=1308.6653|year=2013|title=NGC 5694: Another foster son of the Galactic halo★|doi=10.1093/mnras/stt1558 |last1=Mucciarelli |first1=A. |last2=Bellazzini |first2=M. |last3=Catelan |first3=M. |last4=Dalessandro |first4=E. |last5=Amigo |first5=P. |last6=Correnti |first6=M. |last7=Cortés |first7=C. |last8=d'Orazi |first8=V. |journal=Monthly Notices of the Royal Astronomical Society |volume=435 |issue=4 |pages=3667–3680 |doi-access=free }}

Noctua

NGC 5694 is located below the tail of the former constellation Noctua, which included faint stars within the modern IAU borders of Libra, Hydra, and Virgo.

See also

References

{{Reflist|refs=

{{citation | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry | title=Accreted versus in situ Milky Way globular clusters | journal=Monthly Notices of the Royal Astronomical Society | volume=404 | issue=3 | pages=1203–1214 |date=May 2010 | doi=10.1111/j.1365-2966.2010.16373.x | doi-access=free | bibcode=2010MNRAS.404.1203F | postscript=. |arxiv = 1001.4289 | s2cid=51825384 }}

Sky and Telescope June Issue, pg.66

}}

External links

  • {{commonscat-inline}}
  • {{WikiSky}}

{{Sky|14|39|36.5|-|26|32|18.0|1}}

{{Catalogs|C=66|NGC=5694}}

{{Caldwell catalogue}}

{{NGC60}}

{{Hydra (constellation)}}

{{DEFAULTSORT:NGC 5694}}

Category:Globular clusters

Category:Hydra (constellation)

5694

066b

Category:Astronomical objects discovered in 1783