NGC 6544 is a small globular cluster visible in the constellation Sagittarius. It is magnitude 7.5, diameter 1 arcminute. It is less than 1 degree southeast of Messier 8, the Lagoon Nebula.
NGC 6544 is located in the western part of the constellation, on the edge of a rich star field; its location is easily recoverable as it is located just 50' towards the southeast compared to the famous Lagoon Nebula. It can also be seen with 10×50mm binoculars as a small white spot like a misty star; with a telescope of 120mm and 100× magnification a few small stars may be resolved. Telescopes from 200mm up allow resolving of dozens of dim stars.
Because its declination is rather southern, this cluster can be mainly observed by observers located in the southern hemisphere, although it is still observable even up to medium temperate latitudes. The best time for observation in the evening sky is between June and October.
History of observationsedit
NGC 6544 was observed for the first time by William Herschel in 1784,[2] who looked at it through his 18.4 inch reflector; he described it as a fairly bright and large object, circular and resolvable into stars; the New General Catalogue provides a similar description.
Characteristicsedit
NGC 6544 is a globular cluster of medium density, estimated value of 5 on a scale between 1 and 12[clarification needed]. Its distance is estimated at 2900 parsecs (9450 light years) from the Sun, which in its position corresponds to a distance of 6100 parsecs from the center of the Milky Way and only 100 parsecs from the galactic plane, making it one of the closest globular clusters to the galactic plane known. Its small angular size, equal to just under 4' for the main body volume and corresponding to just 3.2 parsecs, makes it also one of the smaller globular clusters known.
NGC 6544 has a prograde orbit around the Milky Way, but its orbit is otherwise unusual, and it has a high proper motion. It is unclear whether it formed with the Milky Way or came from elsewhere. In 2021, a low-luminosity globular cluster, named VVV-CL160, was discovered with a similar location, metallicity, and trajectory. It may be associated with NGC 6544.[3]
In 1999 a millisecond pulsar in a binary system was discovered within the cluster and cataloged as PSR J1807-2459. There are a few notable variable stars that part of NGC 6544; a 1993 study focused on the region around NGC 6544 has identified some variable stars, of which only one is found to belong in storage: it is a RR Lyrae variable with a period of 0.57 days.
Noteedit
^"Results for NGC 6544". SIMBAD Astronomical Database. Retrieved 30 May 2013.
^Seligman, Courtney. "New General Catalogue objects: NGC 6500 - 6549". cseligman.com. Retrieved 2021-09-11.
^Minniti, Dante; Fernández-Trincado, José G.; Gómez, Matías; Smith, Leigh C.; Lucas, Philip W.; Contreras Ramos, Rodrigo (2021). "Discovery of a new nearby globular cluster with extreme kinematics located in the extension of a halo stream". Astronomy & Astrophysics. 650: 6. arXiv:2106.01383. Bibcode:2021A&A...650L..11M. doi:10.1051/0004-6361/202141129. S2CID 235313691. L11.
Referencesedit
Tirion, Rappaport, Lovi, Uranometria 2000.0, William-Bell inc. ISBN0-943396-15-8
Robert Burnham, Jr, Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system, vol 3, p. 1556
External linksedit
Wikimedia Commons has media related to NGC 6544.
NGC 6544
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6544, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, 2016, learn. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources NGC 6544 news newspapers books scholar JSTOR December 2016 Learn how and when to remove this template message NGC 6544 is a small globular cluster visible in the constellation Sagittarius It is magnitude 7 5 diameter 1 arcminute It is less than 1 degree southeast of Messier 8 the Lagoon Nebula NGC 6544Observation data J2000 epoch ConstellationSagittariusRight ascension18h 07m 21sDeclination 24 59 50 Distance9450 light yearsApparent magnitude V 9Apparent dimensions V 1 Physical characteristicsOther designationsCr 366 GCl 87 1 See also Globular cluster List of globular clusters Contents 1 Observation 2 History of observations 3 Characteristics 4 Note 5 References 6 External linksObservation edit nbsp Map to find NGC 6544NGC 6544 is located in the western part of the constellation on the edge of a rich star field its location is easily recoverable as it is located just 50 towards the southeast compared to the famous Lagoon Nebula It can also be seen with 10 50mm binoculars as a small white spot like a misty star with a telescope of 120mm and 100 magnification a few small stars may be resolved Telescopes from 200mm up allow resolving of dozens of dim stars Because its declination is rather southern this cluster can be mainly observed by observers located in the southern hemisphere although it is still observable even up to medium temperate latitudes The best time for observation in the evening sky is between June and October History of observations editNGC 6544 was observed for the first time by William Herschel in 1784 2 who looked at it through his 18 4 inch reflector he described it as a fairly bright and large object circular and resolvable into stars the New General Catalogue provides a similar description Characteristics editNGC 6544 is a globular cluster of medium density estimated value of 5 on a scale between 1 and 12 clarification needed Its distance is estimated at 2900 parsecs 9450 light years from the Sun which in its position corresponds to a distance of 6100 parsecs from the center of the Milky Way and only 100 parsecs from the galactic plane making it one of the closest globular clusters to the galactic plane known Its small angular size equal to just under 4 for the main body volume and corresponding to just 3 2 parsecs makes it also one of the smaller globular clusters known NGC 6544 has a prograde orbit around the Milky Way but its orbit is otherwise unusual and it has a high proper motion It is unclear whether it formed with the Milky Way or came from elsewhere In 2021 a low luminosity globular cluster named VVV CL160 was discovered with a similar location metallicity and trajectory It may be associated with NGC 6544 3 In 1999 a millisecond pulsar in a binary system was discovered within the cluster and cataloged as PSR J1807 2459 There are a few notable variable stars that part of NGC 6544 a 1993 study focused on the region around NGC 6544 has identified some variable stars of which only one is found to belong in storage it is a RR Lyrae variable with a period of 0 57 days Note edit Results for NGC 6544 SIMBAD Astronomical Database Retrieved 30 May 2013 Seligman Courtney New General Catalogue objects NGC 6500 6549 cseligman com Retrieved 2021 09 11 Minniti Dante Fernandez Trincado Jose G Gomez Matias Smith Leigh C Lucas Philip W Contreras Ramos Rodrigo 2021 Discovery of a new nearby globular cluster with extreme kinematics located in the extension of a halo stream Astronomy amp Astrophysics 650 6 arXiv 2106 01383 Bibcode 2021A amp A 650L 11M doi 10 1051 0004 6361 202141129 S2CID 235313691 L11 References editTirion Rappaport Lovi Uranometria 2000 0 William Bell inc ISBN 0 943396 15 8 Robert Burnham Jr Burnham s Celestial Handbook An observer s guide to the universe beyond the solar system vol 3 p 1556External links edit nbsp Wikimedia Commons has media related to NGC 6544 NGC 6544 nbsp This star cluster related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title NGC 6544 amp oldid 1215792697, wikipedia, wiki, book, books, library,
