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Stephenson 1

Delta Lyrae cluster

Sparse open cluster in the constellation of Lyra

Delta Lyrae cluster
Lyra with the δ Lyrae pair and surrounding cluster stars left of centre
Observation data (J2000 epoch)
Right ascension	18^h 53^m 30.(0)^s^[1]
Declination	+36° 55′ 0(0)″^[1]
Distance	1,220 ly (373 pc)^[2]
Apparent magnitude (V)	3.8^[3]
Apparent dimensions (V)	20′^[3]
Physical characteristics
Mass	589^[4] `M`_☉
Estimated age	49 Myr^[5]
Other designations	Stephenson 1^[6]
Associations
Constellation	Lyra
See also: Open cluster, List of open clusters

The Delta Lyrae cluster or Stephenson 1^[6] is a sparse open cluster of stars located about 1,220^[2] light years away in the northern constellation of Lyra. Centered on the bright star Delta² Lyrae for which it is named^[3] but not a member like Delta¹ Lyrae is with 70% certainty.^[6]

This cluster was first suspected in 1959 by American astronomer Charles B. Stephenson, then was later concluded not to exist by German astronomer Werner Bronkalla in 1963. However, subsequent photometric observations at the Palomar and Mount Wilson observatories led American astronomer Olin J. Eggen to demonstrate that there was an actual cluster, at least for the observed stars down to absolute magnitude +5.5. Eggen's study found at least 33 members.^[7]

The cluster has a visual magnitude of 3.8 and spans an angular diameter of 20 arc minutes.^[3] The tidal radius of the cluster is 38 ly (11.5 pc) and it has an estimated combined mass of 589 times the mass of the Sun.^[4] Based upon its estimated age and motion through space, it may be associated with the Gould Belt.^[5] It includes an Algol variable star, BD+36° 3317, discovered in 2007 from Spain: this is a spectroscopic binary star system that undergoes regular eclipses because the orbital plane is nearly aligned with the line of sight to the Earth.^[2]

An exoplanet has been found orbiting the star Kepler-1627 in this cluster.^[8]

References

1 2 Wu, Zhen-Yu; et al. (November 2009), "The orbits of open clusters in the Galaxy", Monthly Notices of the Royal Astronomical Society, 399 (4): 2146–2164, arXiv:0909.3737, Bibcode:2009MNRAS.399.2146W, doi:10.1111/j.1365-2966.2009.15416.x, S2CID 6066790.
1 2 3 Özdarcan, O.; et al. (July 2012), "BD+36 3317: An algol type eclipsing binary in Delta Lyrae cluster", New Astronomy, 17 (5): 483–487, arXiv:1207.0194, Bibcode:2012NewA...17..483O, doi:10.1016/j.newast.2011.12.002, S2CID 118588705.
1 2 3 4 Crossen, Craig; Rhemann, Gerald (2012), Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes, Springer Science & Business Media, ISBN 978-3709106266, retrieved 2015-11-10.
1 2 Piskunov, A. E.; et al. (January 2008), "Tidal radii and masses of open clusters", Astronomy and Astrophysics, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525.
1 2 Piskunov, A. E.; et al. (January 2006), "Revisiting the population of Galactic open clusters", Astronomy and Astrophysics, 445 (2): 545–565, arXiv:astro-ph/0508575, Bibcode:2006A&A...445..545P, doi:10.1051/0004-6361:20053764, S2CID 18970078.
1 2 3 "NAME del Lyr Cluster". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-05-25.{{cite web}}: CS1 maint: postscript (link)
↑ Eggen, O. J. (April 1968), "Photometric evidence for the existence of a delta Lyrae cluster", Astrophysical Journal, 152: 77, Bibcode:1968ApJ...152...77E, doi:10.1086/149525.
↑ Bouma, L. G.; Curtis, J. L.; et al. (March 2022). "A 38 Million Year Old Neptune-sized Planet in the Kepler Field". The Astronomical Journal. 163 (3): 121. arXiv:2112.14776. Bibcode:2022AJ....163..121B. doi:10.3847/1538-3881/ac4966.

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See also

References