• Source: NGC 6644

NGC 6644 is a bipolar planetary nebula located in the constellation Sagittarius. NGC 6644 was discovered by American astronomer Edward Charles Pickering in 1880. With an apparent visual magnitude of 10.7, a telescope with an aperture of at least 150 millimeters must be used to observe it. The nebula is located about 1.1 degrees northeast of the star Lambda Sagittarii. According to the most recent studies (2010), the distance of NGC 6644 is 6.131 ± 1.226 kpc (∼20,000 light-years).




See also


List of planetary nebulae




References

Kata Kunci Pencarian:

• NGC 67
• Daftar objek NGC 6001 - 7000
• NGC 6644
• List of NGC objects (6001–7000)
• NGC 7329
• NGC 3810
• NGC 67
• NGC 6782
• NGC 6509
• NGC 6818
• HD 173780