輦道增七

**輦道增七**
	; 輦道增七的位置在右下角。; 十字的圖型也稱為北十字。; 藍色的線標示出星座天鵝座的邊界。
观测数据; 曆元 J2000.0 (ICRS) 分点
星座	天鵝座
	輦道增七Aa
赤经	19h 30m 43.286s
赤纬	+27° 57′ 34.84″
星等 (V)	3.21
	輦道增七Ac
赤经	19h 30m 43.295s
赤纬	+27° 57′ 34.62″
星等 (V)	5.85
	輦道增七B
赤经	19h 30m 45.3962s
赤纬	+27° 57′ 54.989″
星等 (V)	5.11
特性
演化阶段	亮巨星
光谱分类	K2II
B−V 色指数	+1.13
V−R 色指数	+0.92
特性
光谱分类	B8Ve
U−B 色指数	-0.32
B−V 色指数	-0.10
天体测定
徑向速度 (Rv)	−23.54 km/s
自行 (μ)	赤经：4.915 mas/yr ; 赤纬：−11.127 mas/yr
视差 (π)	8.9816 ± 0.4474 mas
距离	364.8+15.6; −15.3 ly ; (111.9+4.8; −4.7 pc)
天体测定
輦道增七Aa
绝对星等 (MV)	−2.45
輦道增七Ac
绝对星等 (MV)	−0.25
天体测定
輦道增七B
徑向速度 (Rv)	−18.80 km/s
自行 (μ)	赤经：−1.078 mas/yr ; 赤纬：−1.540 mas/yr
视差 (π)	8.1896 ± 0.0781 mas
距离	395.4+2.9; −3.3 ly ; (121.3+0.9; −1 pc)
位置（相對於輦道增七A）
组成恒星	輦道增七B
觀測曆元	2006
角距離	35.3″
位置角	54°
	軌道
主星	Aa
伴星	Ac
繞行週期 (P)	121.65+3.34; −2.90 yr
半長軸 (a)	0.401+0.007; −0.006"
偏心率 (e)	0.20+0.01; −0.02
倾斜角 (i)	156.15+2.90; −2.63°
升交点黃經 (Ω)	84.43+5.27; −4.50°
近心点曆元 (T)	B2026.36
近心點幅角 (ω); (secondary)	54.72+1.88; −2.24°
半振幅 (K1); (primary)	2.91+0.09; −0.12 km/s
詳細資料
輦道增七Aa
質量	5.2 M☉
半徑	58.69+2.83; −3.12 R☉
表面重力 (log g)	0.93
亮度 (bolometric)	1,259 L☉
溫度	4,383 K
金属量 [Fe/H]	−0.1 dex
自轉速度 (v sin i)	8.34 km/s
輦道增七Ac
質量	2.7 M☉
半徑	3.0 R☉
亮度 (bolometric)	79 L☉
溫度	10,000 K
輦道增七Ad
質量	0.085 ± 0.007 M☉
輦道增七B
質量	3.7 ± 0.8 M☉
半徑	2.59 R☉
表面重力 (log g)	4.00 ± 0.15
亮度 (bolometric)	230 ± 90 L☉
溫度	13,200 ± 600 K
年齡	100 Myr
其他命名
	β Cygni, 6 Cygni, ADS 12540, CCDM J19307+2758, WDS 19307+2758
參考資料庫
SIMBAD	β Cyg (STF 4043)
	Albireo A
	Albireo Aa
	Albireo Ab
	Albireo B

輦道增七（天鹅座β、β Cyg, β Cygni, Beta Cyg）是天鵝座的第五亮星，天鵝座γ、天鵝座δ、和天鵝座ε都比它亮，但因位於天鵝的頭部，所以在拜耳命名法中成為β星。

以肉眼觀看輦道增七是一顆單獨的3等星，但只要低倍數的望遠鏡就可以看出它是雙星，亮的一顆是黃色（它本身又是一對靠得非常近的聯星），使它與光度微弱的藍色伴星在顏色上有著鮮明的對比^[21]。

雙星

輦道增七距離地球380光年（120秒差距）。以肉眼觀看輦道增七是一顆單獨的恆星，然而，在望遠鏡下它很容易解析成為雙星，包括輦道增七A（琥珀色，視星等3.1等），和輦道增七B（藍-綠色，視星等5.1等）^[22]，兩星相距35角秒^[12]。由於它們在顏色上是互補的，因而成為天空中顏色對比最鮮明的一對恆星。目前仍不確知這對恆星是否是互繞的有物理關係的聯星系統。如果是的話，其軌道週期是可能至少十萬年^[22]。

輦道增七A

在1976年，使用斑點干涉儀和基特峰國家天文台2.1米望遠鏡，發現伴星A本身是一顆聯星^[20]^[23]。這對聯星使用干涉儀測量後已經計算出軌道，但因為只觀測過四分之一的軌道，因此軌道參數仍被認為是初步的值^[20]。目前兩顆星之間分離的角度大約是0.4角秒，太過接近而難以用目視觀測，因為在常穩定的大氣條件下，目視的解析能力仍只有20"的大小。

輦道增七B

輦道增七B是一顆快速自轉的Be星，在赤道的自轉速度至少是250公里/秒^[21]。使用光譜儀估計它的表面溫度大約是13,200K ^[16]。

名稱和語源

因為天鹅座的形狀像是一隻展翅的" 天鹅"，而輦道增七就位于天鹅的头部, 所以有时也称为"鸟嘴星"^[24]。輦道增七也与天津四（天鹅座α）、天津二（天鹅座δ）、天津九（天鵝座ε）、和天鹅座η共同构成"北天大十字(北十字)"^[25]。

中世紀說阿拉伯語的天文學家稱之為Albireo（minqār al-dajāja^h，英文的意思是母雞的喙）^[26]，目前的英文名稱是誤解和翻譯錯誤的結果。人們認為它起源於希臘語的ornis，名稱是天鵝座，轉變成阿拉伯語的urnis座^[27]。而在翻譯回拉丁文時，這個名稱被認為是一種藥用植物：鑽果大蒜芥（Erysimum officinale），因此翻譯成拉丁文的該植物名稱ireo。這個短語ab ireo後來又被當成印刷錯誤的阿拉伯語處理，而被轉換成al-bireo^[28]。

minqār al-dajāja^h（منقار ألدجاجة）或Menchir al Dedjadjet的名稱出現在Calendarium of Al Achsasi Al Mouakket這本恆星目錄中，它翻譯成拉丁文是Rostrum Gallinǣ，意思是母雞的喙^[29]。

參考資料

^ ^1.0 ^1.1 Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. 2000, 355: L27. Bibcode:2000A&A...355L..27H.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 Drimmel, Ronald; Sozzetti, Alessandro; Schröder, Klaus-Peter; Bastian, Ulrich; Pinamonti, Matteo; Jack, Dennis; Hernández Huerta, Missael A. A celestial matryoshka: Dynamical and spectroscopic analysis of the Albireo system. Monthly Notices of the Royal Astronomical Society. 2021, 502 (1): 328. Bibcode:2021MNRAS.502..328D. arXiv:2012.01277 . doi:10.1093/mnras/staa4038 .
^ ^3.0 ^3.1 Fabricius, C; Høg, E; Makarov, V. V; Mason, B. D; Wycoff, G. L; Urban, S. E. The Tycho double star catalogue. Astronomy and Astrophysics. 2002, 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822 .
^ ^4.0 ^4.1 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^5.0 ^5.1 ^5.2 ^5.3 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
^ ^6.0 ^6.1 ^6.2 Ginestet, N.; Carquillat, J. M. Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components. The Astrophysical Journal Supplement Series. 2002, 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942 .
^ Ten Brummelaar, Theo; Mason, Brian D; McAlister, Harold A; Roberts, Lewis C; Turner, Nils H; Hartkopf, William I; Bagnuolo, William G. Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory. The Astronomical Journal. 2000, 119 (5): 2403. Bibcode:2000AJ....119.2403T. doi:10.1086/301338 . . See tables 4, 5, 6, and 8. Luminosity from L_bol=10^{2(4.75−M_bol)/5}.
^ Levenhagen, R. S; Leister, N. V. Spectroscopic analysis of southern B and Be stars. Monthly Notices of the Royal Astronomical Society. 2006, 371 (1): 252–262. Bibcode:2006MNRAS.371..252L. S2CID 16492030. arXiv:astro-ph/0606149 . doi:10.1111/j.1365-2966.2006.10655.x .
^ Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ Kharchenko, N. V; Scholz, R.-D; Piskunov, A. E; Röser, S; Schilbach, E. Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations. Astronomische Nachrichten. 2007, 328 (9): 889. Bibcode:2007AN....328..889K. S2CID 119323941. arXiv:0705.0878 . doi:10.1002/asna.200710776.
^ ^11.0 ^11.1 ^11.2 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ ^12.0 ^12.1 ^12.2 進入華盛頓雙星目錄（页面存档备份，存于互联网档案馆），The Washington Double Star Catalog], identifier 19307+2758, discoverer identifier STFA 43. Accessed on line July 9, 2008.
^ Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar, 33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble, The Astronomical Journal, 2023-12-01, 166 (6): 268, Bibcode:2023AJ....166..268B, ISSN 0004-6256, doi:10.3847/1538-3881/ad08be 
^ Lèbre, A.; De Laverny, P.; Do Nascimento, J. D.; De Medeiros, J. R. Lithium abundances and rotational behavior for bright giant stars. Astronomy and Astrophysics. 2006, 450 (3): 1173. Bibcode:2006A&A...450.1173L. doi:10.1051/0004-6361:20053485 .
^ Jack, D.; Schröder, K.-P.; Mittag, M.; Bastian, U. Yet another star in the Albireo system - The discovery of Albireo Ad. Astronomy & Astrophysics. 2022-05-01, 661: A49 [2024-09-15]. ISSN 0004-6361. arXiv:2203.04222 . doi:10.1051/0004-6361/202243255. （原始内容存档于2024-08-31）（英语）.
^ ^16.0 ^16.1 ^16.2 ^16.3 ^16.4 ^16.5 Table 1, Physical Parameters of Southern B- and Be-Type Stars, R. S. Levenhagen and N. V. Leister, The Astronomical Journal 127, #2 (February 2004), pp. 1176–1180, doi:10.1086/381063, Bibcode：2004AJ....127.1176L.
^ Fracassini, Massimo; Gilardoni, Giorgio; Pasinetti, Laura E. Apparent diameters of 172 B5V-A5V stars of the Catalogue of Geneva Observatory. Astrophysics and Space Science. 1973, 22 (1): 141–152. Bibcode:1973Ap&SS..22..141F. S2CID 120496963. doi:10.1007/BF00642829.
^ NAME ALBIREO -- Star in double system , database entry, SIMBAD. Accessed on line July 9, 2008.
^ Entry, WDS identifier 19307+2758, Sixth Catalog of Orbits of Visual Binary Stars 互联网档案馆的存檔，存档日期2017-11-12., William I. Hartkopf & Brian D. Mason, U.S. Naval Observatory. Accessed on line July 9, 2008. (19307+2758) 互联网档案馆的存檔，存档日期2011-05-17.
^ ^20.0 ^20.1 ^20.2 Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005, M. Scardia et al., Astronomische Nachrichten 329, #1 (2008), pp. 54–68. Bibcode：2008AN....329...54S. doi:10.1002/asna.200710834.
^ ^21.0 ^21.1 Albireo （页面存档备份，存于互联网档案馆）, Stars, Jim Kaler. Accessed on line July 9, 2008.
^ ^22.0 ^22.1 p. 46, The Monthly Sky Guide, Ian Ridpath, Wil Tirion, Cambridge University Press, 2006, ISBN 0-521-68435-8.
^ Speckle interferometric measurements of binary stars. VI, H. A. McAlister and E. M. Hendry, Astrophysical Journal Supplement Series 48 (March 1982), pp. 273–278. Bibcode：1982ApJS...48..273M. doi:10.1086/190778.
^ p. 416, In Quest of the Universe, Theo Koupelis and Karl F. Kuhn, 5th ed., Sudbury, Massachusetts: Jones & Bartlett Publishers, 2007, ISBN 0-7637-4387-9.
^ Northern Cross （页面存档备份，存于互联网档案馆）, entry, The Internet Encyclopedia of Science, David Darling. Accessed on line July 24, 2008.
^ p. 196, Star-names and Their Meanings （页面存档备份，存于互联网档案馆）, Richard Hinckley Allen, New York, G. E. Stechert, 1899.
^ p. 24, The names of the stars and constellations compiled from the Latin, Greek and Arabic, W. H. Higgins, Leicester: Samuel Clarke, 1882.
^ p. 194, Allen.
^ Knobel, E. B. Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket. Monthly Notices of the Royal Astronomical Society. June 1895, 55: 429. Bibcode:1895MNRAS..55..429K.

外部連結

Albireo as a Triple Star（页面存档备份，存于互联网档案馆）
Photo by Richard Yandrick; August 30, 2005（页面存档备份，存于互联网档案馆）
A picture of Albireo by Stefan Seip（页面存档备份，存于互联网档案馆）
NightSkyInfo.com - Albireo（页面存档备份，存于互联网档案馆）
Albireo（页面存档备份，存于互联网档案馆） at Alcyone Software's Star Data Pages

引用错误：页面中存在<ref group="lower-alpha">标签或{{efn}}模板，但没有找到相应的<references group="lower-alpha" />标签或{{notelist}}模板

[tycho2-1] 1.0 ^1.1 Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. 2000, 355: L27. Bibcode:2000A&A...355L..27H.

[drimmel2021-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 Drimmel, Ronald; Sozzetti, Alessandro; Schröder, Klaus-Peter; Bastian, Ulrich; Pinamonti, Matteo; Jack, Dennis; Hernández Huerta, Missael A. A celestial matryoshka: Dynamical and spectroscopic analysis of the Albireo system. Monthly Notices of the Royal Astronomical Society. 2021, 502 (1): 328. Bibcode:2021MNRAS.502..328D. arXiv:2012.01277 . doi:10.1093/mnras/staa4038 .

[tycho-3] 3.0 ^3.1 Fabricius, C; Høg, E; Makarov, V. V; Mason, B. D; Wycoff, G. L; Urban, S. E. The Tycho double star catalogue. Astronomy and Astrophysics. 2002, 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822 .

[edr3B-4] 4.0 ^4.1 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[photometry-5] 5.0 ^5.1 ^5.2 ^5.3 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.

[ginestet-6] 6.0 ^6.1 ^6.2 Ginestet, N.; Carquillat, J. M. Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components. The Astrophysical Journal Supplement Series. 2002, 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942 .

[bsd-7] Ten Brummelaar, Theo; Mason, Brian D; McAlister, Harold A; Roberts, Lewis C; Turner, Nils H; Hartkopf, William I; Bagnuolo, William G. Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory. The Astronomical Journal. 2000, 119 (5): 2403. Bibcode:2000AJ....119.2403T. doi:10.1086/301338 . . See tables 4, 5, 6, and 8. Luminosity from L_bol=10^{2(4.75−M_bol)/5}.

[levenhagen-8] Levenhagen, R. S; Leister, N. V. Spectroscopic analysis of southern B and Be stars. Monthly Notices of the Royal Astronomical Society. 2006, 371 (1): 252–262. Bibcode:2006MNRAS.371..252L. S2CID 16492030. arXiv:astro-ph/0606149 . doi:10.1111/j.1365-2966.2006.10655.x .

[DR3-9] Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[ascc-10] Kharchenko, N. V; Scholz, R.-D; Piskunov, A. E; Röser, S; Schilbach, E. Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations. Astronomische Nachrichten. 2007, 328 (9): 889. Bibcode:2007AN....328..889K. S2CID 119323941. arXiv:0705.0878 . doi:10.1002/asna.200710776.

[DR3-2-11] 11.0 ^11.1 ^11.2 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[wdsb-12] 12.0 ^12.1 ^12.2 進入華盛頓雙星目錄（页面存档备份，存于互联网档案馆），The Washington Double Star Catalog], identifier 19307+2758, discoverer identifier STFA 43. Accessed on line July 9, 2008.

[npoi-13] Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar, 33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble, The Astronomical Journal, 2023-12-01, 166 (6): 268, Bibcode:2023AJ....166..268B, ISSN 0004-6256, doi:10.3847/1538-3881/ad08be 

[lefevre-14] Lèbre, A.; De Laverny, P.; Do Nascimento, J. D.; De Medeiros, J. R. Lithium abundances and rotational behavior for bright giant stars. Astronomy and Astrophysics. 2006, 450 (3): 1173. Bibcode:2006A&A...450.1173L. doi:10.1051/0004-6361:20053485 .

[Albireo_Ad-16] Jack, D.; Schröder, K.-P.; Mittag, M.; Bastian, U. Yet another star in the Albireo system - The discovery of Albireo Ad. Astronomy & Astrophysics. 2022-05-01, 661: A49 [2024-09-15]. ISSN 0004-6361. arXiv:2203.04222 . doi:10.1051/0004-6361/202243255. （原始内容存档于2024-08-31）（英语）.

[physparms-17] 16.0 ^16.1 ^16.2 ^16.3 ^16.4 ^16.5 Table 1, Physical Parameters of Southern B- and Be-Type Stars, R. S. Levenhagen and N. V. Leister, The Astronomical Journal 127, #2 (February 2004), pp. 1176–1180, doi:10.1086/381063, Bibcode：2004AJ....127.1176L.

[fracassini-18] Fracassini, Massimo; Gilardoni, Giorgio; Pasinetti, Laura E. Apparent diameters of 172 B5V-A5V stars of the Catalogue of Geneva Observatory. Astrophysics and Space Science. 1973, 22 (1): 141–152. Bibcode:1973Ap&SS..22..141F. S2CID 120496963. doi:10.1007/BF00642829.

[simbada-19] NAME ALBIREO -- Star in double system , database entry, SIMBAD. Accessed on line July 9, 2008.

[wdsa-20] Entry, WDS identifier 19307+2758, Sixth Catalog of Orbits of Visual Binary Stars 互联网档案馆的存檔，存档日期2017-11-12., William I. Hartkopf & Brian D. Mason, U.S. Naval Observatory. Accessed on line July 9, 2008. (19307+2758) 互联网档案馆的存檔，存档日期2011-05-17.

[pisco-21] 20.0 ^20.1 ^20.2 Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005, M. Scardia et al., Astronomische Nachrichten 329, #1 (2008), pp. 54–68. Bibcode：2008AN....329...54S. doi:10.1002/asna.200710834.

[stars-22] 21.0 ^21.1 Albireo （页面存档备份，存于互联网档案馆）, Stars, Jim Kaler. Accessed on line July 9, 2008.

[msg-23] 22.0 ^22.1 p. 46, The Monthly Sky Guide, Ian Ridpath, Wil Tirion, Cambridge University Press, 2006, ISBN 0-521-68435-8.

[24] Speckle interferometric measurements of binary stars. VI, H. A. McAlister and E. M. Hendry, Astrophysical Journal Supplement Series 48 (March 1982), pp. 273–278. Bibcode：1982ApJS...48..273M. doi:10.1086/190778.

[25] . 416, In Quest of the Universe, Theo Koupelis and Karl F. Kuhn, 5th ed., Sudbury, Massachusetts: Jones & Bartlett Publishers, 2007, ISBN 0-7637-4387-9.

[26] Northern Cross （页面存档备份，存于互联网档案馆）, entry, The Internet Encyclopedia of Science, David Darling. Accessed on line July 24, 2008.

[27] . 196, Star-names and Their Meanings （页面存档备份，存于互联网档案馆）, Richard Hinckley Allen, New York, G. E. Stechert, 1899.

[28] . 24, The names of the stars and constellations compiled from the Latin, Greek and Arabic, W. H. Higgins, Leicester: Samuel Clarke, 1882.

[29] . 194, Allen.

[30] Knobel, E. B. Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket. Monthly Notices of the Royal Astronomical Society. June 1895, 55: 429. Bibcode:1895MNRAS..55..429K.

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