Globular Cluster Palomar 2

Palomar 2
Palomar 2: Globular cluster in Auriga; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 80+3*20 min LRGB; Bernese Highlands; © 2011 Radek Chromik

History

The globular cluster Palomar 2 was discovered in the 1950s by the American astronomer Albert George Wilson in the Palomar Observatory Sky Survey photo plates. George O. Abell published a list of 13 globular clusters and 73 planetary nebulae in 1955.

Physical Properties

Palomar 2 is a loose globular cluster of Shapley–Sawyer concentration class IX. The stars appear reddened due to the high absorption by interstellar gas due to the great distance. [331]

Palomar 2
Palomar 2: Image taken with the Hubble Space Telescope. © ESA/Hubble & NASA [373]

The globular cluster was studied in a study with the Hubble Space Telescope. The age has been estimated at 13.25 ± 0.12 billion years. It has about 140'000 solar masses. At a distance of 26.1 ± 1.5 kpc (about 85'000 light years) from the Sun, it is located in the outer halo of our Milky Way. [372]

Further infos at CDS: Palomar 2

Finder Chart

The globular cluster Palomar 2 is located in the constellation Auriga. The best observation time is September to April.

Chart Globular Cluster Palomar 2
Globular Cluster Palomar 2 in constellation Auriga. 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
331«Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey» Abell, G. O.; Publications of the Astronomical Society of the Pacific, Vol. 67, No. 397, p.258-261, August 1955; DOI:10.1086/126815; Bibcode:1955PASP...67..258A
372«Lifting the dust veil from the globular cluster Palomar 2» Charles Bonatto, Ana L Chies-Santos; Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 2, April 2020, Pages 2688–2693; arXiv:2002.08812; DOI:10.1093/mnras/staa510
373A unique cluster: one of the hidden 15; esa.int/ESA_Multimedia/Images/2013/04/A_unique_cluster_one_of_the_hidden_15 (2021-05-31)