Tau Canis Majoris Cluster (NGC 2362)

NGC 2362
NGC 2362: Image taken with VLT in Chile. © 2019 ESO [581]

History

This open cluster was first mentioned in 1654 by the Italian court astronomer Giovanni Batista Hodierna. William Herschel observed it on 4. March 1783 and catalogized it as VII 17. He noted: «A very beautiful cluster of pretty large stars, very rich. Contains the 30 Canis» [277, 463]

Physical Properties

NGC 2362 is a richly populated galactic cluster, where all the natal molecular gas and dust had been blown away. The age of the cluster is estimated to 5 million years. NGC 2362 is dominated by the 4.4 mag bright, multiple star τ CMa, which is of spectral type O9 Ib, as well as several dozen unevolved B-type stars. Throughout the cluster several hundred suspected intermediate and low-mass pre-main sequence members can be found. Ground-based near infrared and Hα emission surveys of NGC 2362 concluded that most (∼90 %) of the low-mass members have already dissipated their optically-thick, inner (<1 AU) circumstellar disks. [579]

The giant H-II region Sharpless 310 (Sh 2-310), which appears as an incomplete ring of about 8° in diameter is associated with the cluster NGC 2362. The gas is ionized by the stars 29 CMa, τ CMa, and the early B-type members of NGC 2362. [580]

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
DesignationNGC 2362
TypeOCL (I3p)
Right Ascension07h 18m 41.4s
Declination-24° 57' 15"
Diameter6 arcmin
Visual magnitude3.8 mag
Metric Distance1.389 kpc
Dreyer DescriptionCl, pL, Ri (30 Can maj)
Identification, RemarksOCL 633, ESO 492-SC9

Finder Chart

NGC 2362 is located in the constellation Canis Maior. The best time for observation is in the months from November until February.

Chart Tau Canis Majoris Cluster (NGC 2362)
Tau Canis Majoris Cluster (NGC 2362) in constellation Canis Maior. Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

More Objects Nearby (±15°)

References

149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
463«Catalogue of one thousand new nebulae and clusters of stars» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1786; DOI:10.1098/rstl.1786.0027
579«NGC 2362: The Terminus of Star Formation» Dahm, S. E.; Handbook of Star Forming Regions, Volume II: The Southern Sky ASP Monograph Publications, Vol. 5. Edited by Bo Reipurth, p.26; December 2008; arXiv:0808.3815; Bibcode:2008hsf2.book...26D
580«The Young Cluster NGC 2362» S. E. Dahm; The Astronomical Journal, Volume 130, Number 4, 2005; DOI:10.1086/433178
581Starshine in Canis Major; eso.org/public/images/potw1911a (2023-01-19)