Technopedia Center
PMB University Brochure
Faculty of Engineering and Computer Science
S1 Informatics S1 Information Systems S1 Information Technology S1 Computer Engineering S1 Electrical Engineering S1 Civil Engineering

faculty of Economics and Business
S1 Management S1 Accountancy

Faculty of Letters and Educational Sciences
S1 English literature S1 English language education S1 Mathematics education S1 Sports Education
teknopedia

Flag Counter
  2. World Encyclopedia
  3. IC 4665 - Wikipedia
IC 4665 - Wikipedia
Coordinates: Sky map 17h 46m 18s, +05° 43′ 00″
From Wikipedia, the free encyclopedia
IC 4665
Cluster IC 4665 with star Beta Ophiuchi below
Observation data (J2000 epoch)
Right ascension17h 46m 13.0s[1]
Declination+05° 36′ 54″[1]
Distance1.12 kly (343.6 pc[2])
Apparent magnitude (V)4.2[3]
Apparent dimensions (V)40′ × 40′[3]
Physical characteristics
Radius33.59[4]
Estimated age55±3 Myr[2]
Other designationsCr 349, Mel 179[5]
Associations
ConstellationOphiuchus
See also: Open cluster, List of open clusters

IC 4665 (Collinder 349 / Melotte 179), also known as the Summer Beehive Cluster[6] or Poseidon's Trident ,[7] is an open cluster of stars in the constellation Ophiuchus, about 1° to the northeast of the star Beta Ophiuchi.[3] It was discovered by Swiss astronomer Philippe Loys de Chéseaux in 1745. The cluster lies about 1,100 light years away from Earth.[2] It is easily visible in the smallest of telescopes and also with binoculars.[3] From a sufficiently dark place it is also visible to the naked eye. It is one of the brightest clusters not to be cataloged by Charles Messier or William Herschel, probably because it is so loose and coarse.

Age estimates for this cluster have ranged from 20 up to as high as 100 million years. Comparison of the stellar lithium depletion with other clusters suggests it began to develop about 55 million years ago.[2] The upper main sequence turnoff age is 42±12 Myr.[8] 819 candidate cluster members have been identified.[9] Two chemically peculiar stars were found to be members in 1977.[10] It has an estimated mass of about 130 suns.

There is evidence that IC 4665 is undergoing a collision with the older cluster Collinder 350, located about 4° away. Currently they are separated by a distance of 118.2 ly (36.25 pc), after having formed at least 1,600 ly (500 pc) apart. It is unclear whether the two clusters will merge as a result of the collision.[11]

References

  1. ^ a b Tarricq, Y.; et al. (March 2021). "3D kinematics and age distribution of the open cluster population". Astronomy & Astrophysics. 647. id. A19. arXiv:2012.04017. Bibcode:2021A&A...647A..19T. doi:10.1051/0004-6361/202039388.
  2. ^ a b c d Jeffries, R. D.; et al. (2023). "A revised age greater than 50 Myr for the young cluster IC 4665". Monthly Notices of the Royal Astronomical Society. 526 (1): 1260–1267. arXiv:2309.07619. Bibcode:2023MNRAS.526.1260J. doi:10.1093/mnras/stad2845.
  3. ^ a b c d Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Science & Business Media. p. 60. ISBN 9783709106266.
  4. ^ Abt, Helmut A.; Snowden, Michael S. (1964). "The Galactic Cluster IC 4665". The Astrophysical Journal. 139: 1139. Bibcode:1964ApJ...139.1139A. doi:10.1086/147856.
  5. ^ "IC 4665". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-17.
  6. ^ "Summer Beehive Cluster". Wolf Creek Observatory. 28 June 2022.
  7. ^ "Fall into Cygnus and More with September Deep-Sky Objects".
  8. ^ Cargile, P. A.; James, D. J. (September 2010). "Employing a New, BVIc Photometric Survey of IC 4665 to Investigate the Age of This Young Open Cluster". The Astronomical Journal. 140 (3): 677–691. arXiv:1005.3329. Bibcode:2010AJ....140..677C. doi:10.1088/0004-6256/140/3/677.
  9. ^ Miret-Roig, N.; et al. (September 2020). "Searching for debris discs in the 30 Myr open cluster IC 4665". Astronomy & Astrophysics. 641. id. A156. arXiv:2007.04992. Bibcode:2020A&A...641A.156M. doi:10.1051/0004-6361/202038205.
  10. ^ Levato, H.; Malaroda, S. (February 1977). "Spectroscopic study of two peculiar stars in IC 4665 : HD 161480 and HD 161733". Publications of the Astronomical Society of the Pacific. 89: 84–94. Bibcode:1977PASP...89...84L. doi:10.1086/130078.
  11. ^ Piatti, Andrés E.; Malhan, Khyati (March 2022). "First evidence of a collision between two unrelated open clusters in the Milky Way". Monthly Notices of the Royal Astronomical Society: Letters. 511 (1): L1–L7. arXiv:2112.03786. Bibcode:2022MNRAS.511L...1P. doi:10.1093/mnrasl/slab130.
Sunting pranala
url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url url
Pusat Layanan

UNIVERSITAS TEKNOKRAT INDONESIA | ASEAN's Best Private University
Jl. ZA. Pagar Alam No.9 -11, Labuhan Ratu, Kec. Kedaton, Kota Bandar Lampung, Lampung 35132
Phone: (0721) 702022
Email: pmb@teknokrat.ac.id