Back NGC 2204 Arabic NGC 2204 Azerbaijani NGC 2204 Byelorussian NGC 2204 BS NGC 2204 CE NGC 2204 German NGC 2204 DIQ NGC 2204 Greek NGC 2204 Esperanto NGC 2204 Basque

NGC 2204

NGC 2204
NGC 2204, Digitized Sky Survey
Observation data (J2000.0 epoch)
Right ascension06h 15m 31.7s[1]
Declination−18° 40′ 12″[1]
Distance13.4 ± 1.3 kly (4.1 ± 0.4 kpc)[2]
Apparent magnitude (V)8.6[3]
Apparent dimensions (V)10.0′[3]
Physical characteristics
Radius16.25ly
Estimated age2.0±0.3 Gyr[2]
Other designationsCollinder 88, Melotte 44[4]
Associations
ConstellationCanis Major
See also: Open cluster, List of open clusters

NGC 2204 is an open cluster of stars in the Canis Major constellation. It was discovered by the German-English astronomer William Herschel on 6 February 1785.[5] The cluster has an integrated visual magnitude of 8.6 and spans a diameter of 10.0′. Resolving the individual member stars is a challenge with a 10 to 12-inch amateur telescope.[3] It is located at a distance of approximately 13,400 light years from the Sun.[2] The cluster shows a mean radial velocity of +91.38±0.30 km/s relative to the Sun,[6] and is orbiting the inner galactic disk region about 1 kpc below the galactic plane.[2]

This is a rich but diffuse cluster with a Trumpler class of III 3m,[7][8] spanning a physical diameter of about 55 ly (17 pc).[9] It is an older cluster with an estimated age of 2.0±0.3 billion years.[10] The metallicity is correspondingly poor,[11][8] showing an abundance of iron about 59% of that in the Sun.[2] There is a prominent giant branch clump on the HR diagram.[7] The cluster has a significant population of blue stragglers,[12][11] an indicator of past stellar mergers. It has a pair of candidate chemically peculiar stars,[8] and five variable stars have been discovered, including four eclipsing variables.[9]

  1. ^ a b Cite error: The named reference Tarricq_et_al_2021 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Jacobson_et_al_2011 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference O'Meara_2007 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SEDS was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Mermilliod_Mayor_2007 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Hawarden_1976 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Dawson_1981 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Rozyczka_2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Salaris_et_al_2004 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Siegel_et_al_2019 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Frogel_Twarog_1983 was invoked but never defined (see the help page).

Rich TVX News Network Site

Rich TVX News Network Info

© MMXXIII Rich X Search. We shall prevail. All rights reserved. Rich X Search