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HD 156768 is a double star in the southern constellation of Ara, with a combined apparent magnitude of 5.86. The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II. The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.
HD 31093, also known as HR 1559, is a visual binary located in the southern constellation Caelum, the chisel. The components have a combined apparent magnitude of 5.83, making it faintly visible to the naked eye. Based on parallax measurements from the Hipparcos spacecraft, the system is estimated to be 268 light years distant. They appear to be receding from the Solar System with a heliocentric radial velocity of 24 km/s.
V4381 Sagittarii is a variable star in the constellation Sagittarius. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent photographic magnitudes 6.57 and 6.62. Its visual apparent magnitude is about 6.54.
μ1 Chamaeleontis, Latinized as Mu1 Chamaeleontis, is a single star in the southern circumpolar constellation Chamaeleon. It is dimly visible to the naked eye with an apparent visual magnitude of 5.53. Based upon parallax measurements, it is located approximately 403 light-years away from the Sun. The radial velocity is poorly constrained, but it appears to be drifting further away at the rate of about 16 km/s
NGC 6115 is an open cluster in the constellation Norma. It is located 2 degrees southeast of Gamma Normae. It is 3175 light-years distant and thought to be around 870 million years old.
NGC 5999 is an open cluster in the constellation Norma. Its brightest star is HIP 78355. It is 5310 light-years distant and thought to be around 400 million years old.
NGC 6005 is an open cluster in the constellation Norma. It is 5875 light-years distant and thought to be around 1.15 billion years old.
NGC 5925 is an open cluster in the constellation Norma. It is 5070 light-years distant and thought to be around 316 million years old.
NGC 6169 is an open cluster in the constellations Norma and Scorpius. It is 3280 light-years distant and thought to be around 32 million years old.
NGC 2539 is an open cluster in the constellation Puppis, located at the north edge of the constellation. It was discovered by William Herschel on January 31, 1785. It is a moderately rich cluster and with little central concentration, with Trumpler class II1m.
IC 2395 is an open cluster in the constellation Vela.
NGC 5316 is an open cluster in the constellation Centaurus. It was discovered by James Dunlop in 1826. Located approximately 4,000 light years away from Earth, it is located in the Carina-Sagittarius arm.
NGC 4349 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 7,000 light years away from Earth.
NGC 4103 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 5,000 light years away from Earth, in the Carina-Sagittarius arm.
IC 2714 is an open cluster in the constellation Carina. It was discovered by James Dunlop in 1826. It is located approximately 4,000 light years away from Earth, in the Carina–Sagittarius Arm.
NGC 4815 is an open cluster in the constellation Musca. It was discovered by John Herschel in 1834. It is located approximately 10,000 light years away from Earth.
NGC 657 is an open cluster containing very few stars or a group of stars located in the constellation Cassiopeia. It was discovered by British astronomer John Herschel in 1831.
HD 47500, also known as HR 2446, is a binary star in the southern constellation Columba. The primary has an apparent magnitude of 5.91, making it faintly visible to the naked eye if viewed under ideal conditions. As for the companion, its visual magnitude is 7.51. The system is located relatively far at a distance of 1,120 light years based on parallax measurements, and is receding with a heliocentric radial velocity of 21 km/s.
HD 36187, also known as HR 1835, is a solitary, bluish-white hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.55, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, it is estimated to be 282 light years away from the Solar System. However, it is receding rapidly with a heliocentric radial velocity of 50 km/s. At its current distance, HD 36187's brightness is diminished by 0.21 magnitude due to interstellar dust.
HD 29678, also known as HR 1491, is a solitary star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a yellowish-white hued point of light with an apparent magnitude of 5.95. The object is located relatively close at a distance of 155 light-years and it is drifting closer with a somewhat constrained heliocentric radial velocity of approximately −6.0 km/s. At is current distance, HD 29678's brightness is diminished by 0.13 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.60. Its observed kinematics suggest that it is a member of the Pleiades supercluster.
References
- 1 2 3 4 5 6 7 Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics. 633: A99. arXiv: 1911.07075 . Bibcode:2020A&A...633A..99C. doi: 10.1051/0004-6361/201936691 . ISSN 0004-6361.
- 1 2 Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S.; Scholz, R.-D. (26 March 2007). "Towards absolute scales for the radii and masses of open clusters". Astronomy & Astrophysics. 468 (1): 151–161. arXiv: astro-ph/0702517 . Bibcode:2007A&A...468..151P. doi: 10.1051/0004-6361:20077073 . eISSN 1432-0746. ISSN 0004-6361.
- 1 2 Vande Putte, D.; Garnier, T. P.; Ferreras, I.; Mignani, R. P.; Cropper, Mark (6 September 2010). "A kinematic study of open clusters: implications for their origin". Monthly Notices of the Royal Astronomical Society. 407 (4): 2109–2121. arXiv: 0912.0695 . Bibcode:2010MNRAS.407.2109V. doi: 10.1111/j.1365-2966.2010.17025.x . ISSN 0035-8711.
- ↑ Platais, Imants; Kozhurina-Platais, Vera; van Leeuwen, Floor (November 1998). "A Search for Star Clusters from the ]Hipparcos Data". The Astronomical Journal. 116 (5): 2423–2430. Bibcode:1998AJ....116.2423P. doi: 10.1086/300606 . ISSN 0004-6256.
- ↑ Piskunov, A. E.; Kharchenko, N. V.; Röser, S.; Schilbach, E.; Scholz, R.-D. (16 December 2005). "Revisiting the population of Galactic open clusters". Astronomy & Astrophysics. 445 (2): 545–565. arXiv: astro-ph/0508575 . Bibcode:2006A&A...445..545P. doi: 10.1051/0004-6361:20053764 . eISSN 1432-0746. ISSN 0004-6361.
- ↑ "Cl Platais 8". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 7 January 2021.
- ↑ Cantat-Gaudin, T.; Jordi, C.; Vallenari, A.; Bragaglia, A.; Balaguer-Núñez, L.; Soubiran, C.; Bossini, D.; Moitinho, A.; Castro-Ginard, A.; Krone-Martins, A.; Casamiquela, L.; Sordo, R.; Carrera, R. (October 2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics. 618: A93. arXiv: 1805.08726 . Bibcode:2018A&A...618A..93C. doi: 10.1051/0004-6361/201833476 . ISSN 0004-6361.
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