NGC 6642

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

{{Infobox globular cluster

| name = NGC 6642

| image = 250px

| caption = Image of NGC 6642 was created from visible and infrared images taken with the Wide Field Channel of the Advanced Camera for Surveys.

| credit =

| epoch = J2000

| class = V?

| constellation = Sagittarius

| ra = {{RA|18|31|54.23}}{{cite web|title=SIMBAD query results|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+6642|work=SIMBAD Astronomical Database|access-date=6 February 2012}}

| dec = {{DEC|-23|28|34.1}}

| dist_ly = {{cvt|8.2|±|0.7|kpc|kly|order=flip|lk=on}}

| dist_pc =

| appmag_v =

| size_v = 48"

| mass_msol = {{Val|1.09|e=5}}

| mass_kg =

| radius_ly =

| metal_fe = –1.26

| v_hb =

| age =

| notes =

| names = Cr 381, C 1828-235, ESO 522-32, GCl 97, Mel 203

}}

NGC 6642 is a globular cluster located 26,700 light-years from Earth, in the constellation Sagittarius. Many "blue stragglers" (stars which seemingly lag behind in their rate of aging) have been spotted in this globular, and it is known to be lacking in low-mass stars.

During the June 2094 lunar eclipse, a total lunar eclipse, it will be occulted by the Moon over New Guinea, Northern Australia and the Pacific Ocean.{{cite book |date=2002 |first=Jan |last=Meeus |chapter=Occultations of deep-sky objects during a total lunar eclipse |pages=157-162 |title=More Mathematical Astronomy Morsels |isbn=0943396743 |url=https://falakmu.id/khgt/dokumen/More%20mathematical%20astronomy%20morsels%20(Jean%20Meeus)%20(Z-Library).pdf}}{{rp|161}}

References

{{reflist|refs=

{{cite journal | doi=10.1051/0004-6361/202141596 | title=Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters | year=2022 | last1=Oliveira | first1=R. A. P. | last2=Ortolani | first2=S. | last3=Barbuy | first3=B. | last4=Kerber | first4=L. O. | last5=Maia | first5=F. F. S. | last6=Bica | first6=E. | last7=Cassisi | first7=S. | last8=Souza | first8=S. O. | last9=Pérez-Villegas | first9=A. | journal=Astronomy & Astrophysics | volume=657 | pages=A123 | arxiv=2110.13943 | bibcode=2022A&A...657A.123O | s2cid=239998638}}

{{citation | display-authors=1 | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | bibcode=2011ApJ...742...51B | postscript=. |arxiv = 1108.4402 | s2cid=118649860 }}

{{cite journal|last=Balbinot|first=E.|author2=Santiago, B. X. |author3=Bica, E. |author4= Bonatto, C. |title=The globular cluster NGC 6642: evidence for a depleted mass function in a very old cluster|journal=Monthly Notices of the Royal Astronomical Society|date=1 July 2009|volume=396|issue=3|pages=1596–1602|doi=10.1111/j.1365-2966.2009.14819.x|doi-access=free |arxiv = 0903.4325 |bibcode = 2009MNRAS.396.1596B |s2cid=15354065 }}

}}

External links

{{Commons category-inline}}

Category:Globular clusters

6642

Category:Sagittarius (constellation)