NGC 55

NGC 55
NGC 55
	拉西亚天文台拍摄的不规则星系NGC 55
观测资料（J2000 历元）
星座	玉夫座
赤经	00h 14m 53.6s
赤纬	-39° 11′ 47.9″
红移	0.000437
径向速度	131 ± 2 km/s
距离	650 ± 65万光年; （2.00 ± 0.2 Mpc）
视星等 (V)	7.87
特征
类型	SB(s)m
质量	(2.0 ± 0.4) × 1010 M☉
大小	~68,500 ly（20.99 kpc） (estimated)
角直径 (V)	32.4′ × 5.6′
其他名称
	PGC 1014、Caldwell 72、2MASS J00145360-3911478、IRAS F00124-3929、ESO 293-50、MCG -07-01-013
	参见：星系、星系列表

NGC 55也称为珍珠串星系（英语：String of Pearls Galaxy）^[7]，是位于星座玉夫座的一个麦哲伦型棒旋星系，距离我们约650万光年。天文学家詹姆士·敦洛普于1826年7月7日发现了它^[8]。它和它的邻居NGC 300一样，是离本星系群最近的星系之一，可能位于银河系和玉夫座星系群之间^[8]，估计其质量为（2.0 ± 0.4）× 10¹⁰M_☉^[9]。

附近星系和星系群资讯

NGC 55和螺旋星系 NGC 300传统上被认定为玉夫座星系群的成员，这是同名星座中附近的星系群。然而，最近的距离量测表明，这两个星系实际上只是前景星系^[10]。

NGC 55和NGC 300很可能形成一对引力束缚对^[4]。

视觉外观

《韦伯学会深空观察者手册（英语：Webb Society Deep-Sky Observer's Handbook）》^[11]对NGC 55写了如下的描述：“近边缘，不对称，凸起附近有一些尘埃的迹象，凸起呈弥漫状，宽阔，有些细长，南缘锋利；在凸起的东南部，它强烈弯曲，并排列著4或5个微弱的节；曲线的北缘很陡。”伯纳姆称其为“南方天空中杰出的星系之一”，有点像大麦哲伦星云的缩小版^[12]。

注解

^{^} 平均(6.9 ± 0.7,^[3] 7.5 ± 1.1^[4]) = ((6.9 + 7.5) / 2) ± ((0.7² + 1.1²)^0.5 / 2) = 7.2 ± 0.7

参考资料

^ R. W. Sinnott (编). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. 1988. ISBN 978-0-933346-51-2.
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 ^2.7 NASA/IPAC Extragalactic Database. Results for NGC 55. [2006-10-17].
^ ^3.0 ^3.1 Karachentsev, I. D.; Kashibadze, O. G. Masses of the local group and of the M81 group estimated from distortions in the local velocity field. Astrophysics. 2006, 49 (1): 3–18. Bibcode:2006Ap.....49....3K. S2CID 120973010. doi:10.1007/s10511-006-0002-6.
^ ^4.0 ^4.1 ^4.2 van de Steene, G. C.; et al. Distance determination to NGC 55 from the planetary nebula luminosity function. Astronomy and Astrophysics. 2006, 455 (3): 891–896. Bibcode:2006A&A...455..891V. doi:10.1051/0004-6361:20053475 .
^ ^5.0 ^5.1 NGC 55. SIMBAD. 斯特拉斯堡天文资料中心.
^ Armando, Gil de Paz; et al. The GALEX Ultraviolet Atlas of Nearby Galaxies. Astrophysical Journal Supplement Series. 2007, 173 (2): 185–255. Bibcode:2007ApJS..173..185G. S2CID 119085482. arXiv:astro-ph/0606440 . doi:10.1086/516636.
^ Stoyan, Ronald; Schurig, Stephan. interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. 2014. ISBN 978-1-107-50338-0. OCLC 920437579.
^ ^8.0 ^8.1 New General Catalog Objects: NGC 50 - 99. cseligman.com. [2017-12-12] （美国英语）.
^ Westmeier, T.; Koribalski, B. S.; Braun, R. Gas and dark matter in the Sculptor group: NGC 55. Monthly Notices of the Royal Astronomical Society. 2013, 434 (4): 3511–3525. arXiv:1307.2962 . doi:10.1093/mnras/stt1271 .
^ I. D. Karachentsev; et al. Distances to nearby galaxies in Sculptor. Astronomy and Astrophysics. 2003, 404 (1): 93–111. Bibcode:2003A&A...404...93K. S2CID 54977869. arXiv:astro-ph/0302045 . doi:10.1051/0004-6361:20030170.
^ Jones, K. G. Webb Society Deep-Sky Observer's Handbook. Enslow Publishers. 1981. ISBN 978-0-89490-134-8. OL 8249797M.
^ Robert Burnham Jr. Burnham's Celestial Handbook III. New York: Dover. 1978: 1733. ISBN 978-0-486-24065-7.

外部链接

NGC 55 in Sculptor
SEDS: Spiral Galaxy NGC 55
WikiSky上关于NGC 55的内容：DSS2, SDSS, GALEX, IRAS, 氢α, X射线, 天文照片, 天图, 文章和图片

天文学目录
NGC天体表：	NGC 53 - NGC 54 - NGC 55 - NGC 56 - NGC 57
主要星系目录：	PGC 1012 - PGC 1013 - PGC 1014 - PGC 1015 - PGC 1016

[sinnott1988-1] R. W. Sinnott (编). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. 1988. ISBN 978-0-933346-51-2.

[ned-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 ^2.7 NASA/IPAC Extragalactic Database. Results for NGC 55. [2006-10-17].

[Karachentsevetal2006-3] 3.0 ^3.1 Karachentsev, I. D.; Kashibadze, O. G. Masses of the local group and of the M81 group estimated from distortions in the local velocity field. Astrophysics. 2006, 49 (1): 3–18. Bibcode:2006Ap.....49....3K. S2CID 120973010. doi:10.1007/s10511-006-0002-6.

[vandesteeneetal2006-4] 4.0 ^4.1 ^4.2 van de Steene, G. C.; et al. Distance determination to NGC 55 from the planetary nebula luminosity function. Astronomy and Astrophysics. 2006, 455 (3): 891–896. Bibcode:2006A&A...455..891V. doi:10.1051/0004-6361:20053475 .

[SIMBAD-NGC55-5] 5.0 ^5.1 NGC 55. SIMBAD. 斯特拉斯堡天文资料中心.

[GAXEL-6] Armando, Gil de Paz; et al. The GALEX Ultraviolet Atlas of Nearby Galaxies. Astrophysical Journal Supplement Series. 2007, 173 (2): 185–255. Bibcode:2007ApJS..173..185G. S2CID 119085482. arXiv:astro-ph/0606440 . doi:10.1086/516636.

[interstellarum-7] Stoyan, Ronald; Schurig, Stephan. interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. 2014. ISBN 978-1-107-50338-0. OCLC 920437579.

[cseligman-8] 8.0 ^8.1 New General Catalog Objects: NGC 50 - 99. cseligman.com. [2017-12-12] （美国英语）.

[9] Westmeier, T.; Koribalski, B. S.; Braun, R. Gas and dark matter in the Sculptor group: NGC 55. Monthly Notices of the Royal Astronomical Society. 2013, 434 (4): 3511–3525. arXiv:1307.2962 . doi:10.1093/mnras/stt1271 .

[karachentsevetal2003-10] I. D. Karachentsev; et al. Distances to nearby galaxies in Sculptor. Astronomy and Astrophysics. 2003, 404 (1): 93–111. Bibcode:2003A&A...404...93K. S2CID 54977869. arXiv:astro-ph/0302045 . doi:10.1051/0004-6361:20030170.

[Webb-11] Jones, K. G. Webb Society Deep-Sky Observer's Handbook. Enslow Publishers. 1981. ISBN 978-0-89490-134-8. OL 8249797M.

[burnham-12] Robert Burnham Jr. Burnham's Celestial Handbook III. New York: Dover. 1978: 1733. ISBN 978-0-486-24065-7.

[1]

[2]

[3]

[4]

[a]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

查论编玉夫座恒星
拜耳命名法	α β γ δ ε ζ η θ ι κ¹ κ² λ¹ λ² μ ξ π σ τ
近星	Gliese 1 GJ 2005
玉夫座恒星列表

查论编科德韦尔天体
列表	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109
参看	梅西耶天体星云和星团总表 NGC天体表赫歇尔目录
科德韦尔天体科德韦尔天体天文学主题页

附近星系和星系群资讯

视觉外观

相关条目

注解

参考资料

外部链接