M28

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Globular clusters discovered by Charles Messier in 1764

M28 (also called NGC 6626) is a small secondary brightness But very dense Sagittarius Regional Globular cluster 。^[1]

M28 is the Milky Way Silver halo One of hundreds of globular clusters.

Chinese name: M28
Foreign name: Messier 28
Classification: Globular cluster
Discoverer: Charles Messier
Discovery time: July 27, 1764
Quality: 5.51×10^5 Solar mass

Diameter: 60 light years
Apparent magnitude: +6.8
Right ascension: 18:24:32.89
Declination: –24°52′11.4″
Distance from ground: 17900 light years (5.5 thousand second gap)^[1]
Apparent diameter: 11 cents
Metal abundance: [Fe/H]=-1.32

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M28 position

The M28 is slightly elliptical, and the M28 can be observed with an 8cm telescope. It requires a larger telescope to decompose the fixed star 。

18 in M28 RR Lyrae variable There is also a variable star (Cepheid type II) with a period of 17 days, and there is another variable star Long-period variable star (variable star 17).

In 1987, it was found in m28 that there was a millisecond level Pulsar （ neutron star ）And numbered PSRB1821 – 24, making M28 the first pulsar Globular cluster 。 The rotation period of the pulsar is 11 milliseconds.

M28 is to the right of lambda Sagittarius.

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