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NGC 6633 .
NGC 6633 疏散星团NGC 6633
观测资料 (J2000.0 历元 ) 星座 蛇夫座 赤经 18h 27.7m 赤纬 6° 34′ 距离 1,040 ly 视星等 (V) 4.6 视大小 (V) 27′ 物理特征 估计年龄 660百万年 其他特征 NGC 6633、De Cheseaux No. 3 H VIII.72、Cr 380、Mel 201 相关条目:疏散星团 、NGC天体表
NGC 6633 是在蛇夫座 中的一个明亮星团。它在1745-46年由尚-菲利浦·德·歇索 发现,卡罗琳·赫歇尔 在1783年又独立重新发现,并被列入其兄弟威廉 的目录,编号为H VIII.72[1] 。这个星团明亮到可以用肉眼看到,被认为是双筒望远镜或小型望远镜观赏的理想天体[2] 。
NGC 6633也被与IC 4756和称为特威德星团;也称为胡克船长星团和黄蜂星团[3] 。它也被标示为Cr 380或Mel 201。这个星团几乎与满月一样大,已知包含38颗恒星[4] ,最亮的恒星是7.6等;总星等4.6等。它的年龄估计为6.6亿年。[1]
星团至少包含一颗化学性质特殊的恒星:NGC 6633 48(BD+06 3755)[4] 。
视星等8等的联星HD 169959(NGC 6633 58)虽然在疏散星团的视线范围内,但在物理上与星团无关[4] 。
显示NGC 6633位置的地图(罗伯特·穆拉)
参考资料
^ 1.0 1.1 NGC 6633 . messier.seds.org. [2020-10-05 ] . (原始内容存档 于2021-01-18) (美国英语) .
^ Michael Bakich. Open cluster NGC 6633, a complex of dark nebulae, and globular cluster M54 . astronomy.com. [2020-10-05 ] . (原始内容存档 于2020-09-20).
^ O'Meara, Stephen James. Deep-Sky Companions: Hidden Treasures. Cambridge University Press. 2007: 457–458. ISBN 978-0521-83704-0 .
^ 4.0 4.1 4.2 Paunzen, E.; Netopil, M.; Maitzen, H. M.; Pavlovski, K.; Schnell, A.; Zejda, M., Photoelectric search for peculiar stars in open clusters, Astronomy & Astrophysics, 2014, 564 : A42, S2CID 119174151 , arXiv:1403.3538 , doi:10.1051/0004-6361/201423521
外部链接
NGC 6633 - Tweedledum Cluster (Kurt Zeppetello)
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