NGC 752
Amateur recording from NGC 752 | |
AladinLite | |
Constellation | Andromeda |
Position equinox : J2000.0 |
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Right ascension | 01 h 57 m 34.8 s |
declination | + 37 ° 50 ′ 00 ″ |
Appearance
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classification | III 1 m |
Brightness (visual) | 5.7 likes |
Angular expansion | 75 ' |
Number of stars | approx. 60 |
Brightest star | +8.96 mag |
Variable stars | DS Andromedae |
Redness ( excess color E (BV)) | 0.034 mag |
Physical data
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Affiliation | Milky Way |
Redshift | (12 ± 6) · 10 −6 |
Radial velocity | (3.5 ± 1.8) km / s |
distance | 1500 ly (457 pc ) |
Absolute brightness | −2.3 mag |
diameter | 19 ly |
Age | about 1.1 billion years |
Metallicity [Fe / H] | −0.08 |
history | |
Discovered by | Giovanni Battista Hodierna |
Discovery time | before 1654 |
Catalog names | |
NGC 752 • C 0154 + 374 • OCl 363 • Mel 12 • Cr 23 • Lund 64 • GC 457 • H VII 32 • h 174 • |
NGC 752 is a +5.7 mag bright open star cluster with an area of about 75 'in the constellation Andromeda . It is around 1,500 light years away from the solar system and has a diameter of around 30 light years. According to the state of development of the star cluster, its age is estimated to be 1.1 to 1.6 billion years. Due to his old age he is relatively poor in stars and already very scattered. NGC 752 can be seen as a faint nebula with the naked eye.
The discovery of NGC 752 goes back to the Sicilian scholar and priest, Giovanni Battista Hodierna , who discovered this cluster shortly before 1654. Hodierna observed under a dark country sky with a Galilean telescope that was only 20 times magnified. Later, however, his work was hardly noticed, and it was not until the 1980s that his work was rediscovered.
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b SEDS : NGC 759
- ↑ SIMBAD Query
- ↑ WEBDA
- ↑ Stars and Space October 2013 p. 66f
- ↑ Seligman
- ↑ Stars and Space November 2007 p. 62