NGC 4221

NGC 4221
NGC 4221
	SDSS拍摄的NGC 4221
观测资料（J2000 曆元）
星座	天龙座
赤经	12h 15m 59.860s
赤纬	+66° 13′ 50.90″
紅移	0.00439
徑向速度	1313 ± 3 km/s
距离	75.9 Mly（23.28 Mpc）
属于	NGC 4256星系群
视星等 (B)	13.6
特征
类型	(R)SB0+(r)
大小	55,900 ly（17.15 kpc）
角直徑 (V)	1.347′ × 0.943′
其他名称
	UGC 7288、MCG+11-15-040、PGC 39266
	參見：星系、星系列表

NGC 4221是一个位于天龙座的透鏡狀星系，距离地球7590万光年^[3] ，1832年4月3日由約翰·赫歇爾发现^[5]，属于NGC 4256星系群^[4]^[6]^[7]。

参考

^ ^1.0 ^1.1 ^1.2 ^1.3 Results for object NGC 4221 (NGC 4221). NASA/IPAC Extragalactic Database. California Institute of Technology. [2021-04-18]. （原始内容存档于2022-07-05）.
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 NGC 4221. SIMBAD. 斯特拉斯堡天文資料中心. [2021-04-18].
^ ^3.0 ^3.1 Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. Groups of Galaxies in the Two Micron All Sky Redshift Survey. The Astrophysical Journal. 2007, 655 (2): 790–813. Bibcode:2007ApJ...655..790C. arXiv:astro-ph/0610732  . doi:10.1086/510201.
^ ^4.0 ^4.1 Fouque, P.; Gourgoulhon, E.; Chamaraux, P.; Paturel, G. Groups of galaxies within 80 Mpc. II. The catalogue of groups and group members.. Astronomy and Astrophysics Supplement Series. 1992-05-01, 93: 211–233 [2022-07-05]. ISSN 0365-0138. （原始内容存档于2022-04-20）.
^ Seligman, Courtney. New General Catalogue objects: NGC 4200 - 4249. cseligman.com. [2021-04-18]. （原始内容存档于2019-02-09）.
^ Garcia, A. M. General study of group membership. II. Determination of nearby groups.. Astronomy and Astrophysics Supplement Series. 1993-07-01, 100: 47–90 [2022-07-05]. ISSN 0365-0138. （原始内容存档于2022-04-15）.
^ Giuricin, Giuliano; Marinoni, Christian; Ceriani, Lorenzo; Pisani, Armando. Nearby Optical Galaxies: Selection of the Sample and Identification of Groups. The Astrophysical Journal. November 2000, 543 (1): 178–194 [2022-07-05]. ISSN 0004-637X. doi:10.1086/317070. （原始内容存档于2021-11-05）（英语）.

外部链接

维基共享资源上的相關多媒體資源：NGC 4221

这是一篇透鏡狀星系小作品。您可以通过编辑或修订扩充其内容。

[NED-1] 1.0 ^1.1 ^1.2 ^1.3 Results for object NGC 4221 (NGC 4221). NASA/IPAC Extragalactic Database. California Institute of Technology. [2021-04-18]. （原始内容存档于2022-07-05）.

[SIMBAD-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 NGC 4221. SIMBAD. 斯特拉斯堡天文資料中心. [2021-04-18].

[Crook-3] 3.0 ^3.1 Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. Groups of Galaxies in the Two Micron All Sky Redshift Survey. The Astrophysical Journal. 2007, 655 (2): 790–813. Bibcode:2007ApJ...655..790C. arXiv:astro-ph/0610732  . doi:10.1086/510201.

[:0-4] 4.0 ^4.1 Fouque, P.; Gourgoulhon, E.; Chamaraux, P.; Paturel, G. Groups of galaxies within 80 Mpc. II. The catalogue of groups and group members.. Astronomy and Astrophysics Supplement Series. 1992-05-01, 93: 211–233 [2022-07-05]. ISSN 0365-0138. （原始内容存档于2022-04-20）.

[cseligman-5] Seligman, Courtney. New General Catalogue objects: NGC 4200 - 4249. cseligman.com. [2021-04-18]. （原始内容存档于2019-02-09）.

[6] Garcia, A. M. General study of group membership. II. Determination of nearby groups.. Astronomy and Astrophysics Supplement Series. 1993-07-01, 100: 47–90 [2022-07-05]. ISSN 0365-0138. （原始内容存档于2022-04-15）.

[7] Giuricin, Giuliano; Marinoni, Christian; Ceriani, Lorenzo; Pisani, Armando. Nearby Optical Galaxies: Selection of the Sample and Identification of Groups. The Astrophysical Journal. November 2000, 543 (1): 178–194 [2022-07-05]. ISSN 0004-637X. doi:10.1086/317070. （原始内容存档于2021-11-05）（英语）.

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