Astronomy:NGC 6866

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NGC 6866
File:230px
Observation data (J2000 epoch)
ConstellationCygnus
Right ascension 20h 03m 55.9s[1]
Declination+44° 09′ 29″[1]
Distance4.35 ± 0.53 kly (1.335 ± 0.163 kpc)[2]
Apparent magnitude (V)7.6[3]
Apparent dimensions (V)7′[3]
Physical characteristics
Mass1,274.52 M☉[4] M☉
Radius25.1 ± 3.6 ly (7.7 ± 1.1 pc)[4]
Estimated age430±50 Ma[5]
Other designationsNGC 6866[6]
See also: Open cluster, List of open clusters

NGC 6866 is a young[5] open cluster of stars in the northern constellation Cygnus. It was discovered by German astronomer Caroline Herschel on 23 July 1783.[3] This cluster is located at an estimated distance of 4.35 ± 0.53 thousand light-years from the Sun,[2] and is circling the Galactic Center with a slight orbital eccentricity of 0.12.[7] It shows a heliocentric radial velocity of 12.18±1.14 km/s.[4]

Map showing location of NGC 6866

The angular radius of the cluster is estimated as about 21′±3′, while the core radius is 10.3′±1.8′. A total of 1,357 main sequence stars are determined to be likely cluster members. The combined mass of member stars is estimated as 1,274.52 M☉. It shows a loss rate of 1.92 stars per million years.[4] The metallicity of the cluster – the abundance of elements of greater mass than helium – is similar to that in the Sun.[7]

NGC 6866 is one of four clusters located in what was the field of view of the Kepler space telescope. Using asteroseismic analysis of the Kepler data, the age of NGC 6866 is estimated to be about 430 million years old.[5] The cluster includes 31 Delta Scuti and 8 Gamma Doradus variables, with four eclipsing binaries, and 106 stars displaying rotational modulation that is indicative of star spots.[8] Two systems are W Ursae Majoris variables.[9]

References

  1. ↑ 1.0 1.1 Tarricq, Y. et al. (March 2021). "3D kinematics and age distribution of the open cluster population". Astronomy & Astrophysics 647: id. A19. doi:10.1051/0004-6361/202039388. Bibcode: 2021A&A...647A..19T. 
  2. ↑ 2.0 2.1 Spina, L. et al. (2021). "The GALAH survey: Tracing the Galactic disc with open clusters". Monthly Notices of the Royal Astronomical Society 503 (3): 3279. doi:10.1093/mnras/stab471. Bibcode: 2021MNRAS.503.3279S. 
  3. ↑ 3.0 3.1 3.2 Flanders, Tony (9 May 2007). "In Caroline Herschel's footsteps". https://skyandtelescope.org/observing/in-caroline-herschels-footsteps/. 
  4. ↑ 4.0 4.1 4.2 4.3 Joshi, Gireesh C.; Tyagi, R. K. (January 2016). "Identification of cluster MS stars and their implication - I. NGC 2099 and NGC 6866". Monthly Notices of the Royal Astronomical Society 455 (1): 785–805. doi:10.1093/mnras/stv2353. Bibcode: 2016MNRAS.455..785J. 
  5. ↑ 5.0 5.1 5.2 Brogaard, K. et al. (2023). "Asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia". Astronomy & Astrophysics 679: A23. doi:10.1051/0004-6361/202347330. Bibcode: 2023A&A...679A..23B. 
  6. ↑ "NGC 6866". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6866. 
  7. ↑ 7.0 7.1 Bostancı, Z. F. et al. (October 2015). "A comprehensive study of the open cluster NGC 6866". Monthly Notices of the Royal Astronomical Society 453 (1): 1095–1107. doi:10.1093/mnras/stv1665. Bibcode: 2015MNRAS.453.1095B. 
  8. ↑ Balona, L. A. et al. (February 2013). "Pulsation and rotation of Kepler stars in the NGC 6866 field". Monthly Notices of the Royal Astronomical Society 429 (2): 1466–1478. doi:10.1093/mnras/sts429. Bibcode: 2013MNRAS.429.1466B. 
  9. ↑ Joshi, Yogesh Chandra et al. (April 2016). "Photometric studies of two W UMa type variables in the field of distant open cluster NGC 6866". Research in Astronomy and Astrophysics 16 (4): id. 63. doi:10.1088/1674-4527/16/4/063. Bibcode: 2016RAA....16...63J. 

Template:NGC objects:6500-6999

Coordinates: Sky map 20h 03m 42s, +44° 00′ 00″



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