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**九斿增四**
觀測資料; 曆元 J2000
星座	波江座
星官
赤經	04h 38m 10.82486s
赤緯	-14° 18′ 14.4600″
視星等（V）	3.87 (4.02 / 6.95)
特性
光谱分类	K1III
U−B 色指数	+1.03
B−V 色指数	+1.09
天体测定
徑向速度 (Rv)	43.33 ± 0.28 km/s
自行 (μ)	赤经：-76.59 mas/yr ; 赤纬：-176.78 mas/yr
视差 (π)	29.69 ± 0.37 mas
距离	110 ± 1 ly ; (33.7 ± 0.4 pc)
	軌道
繞行週期 (P)	77.4 ± 1.5 yr
半長軸 (a)	0.7069 ± 0.0093"
偏心率 (e)	0.666 ± 0.017
倾斜角 (i)	59.8 ± 1.8°
升交点黃經 (Ω)	171.25 ± 0.96°
近心点曆元 (T)	1976.77 ± 0.26
近心點幅角 (ω); (secondary)	23.5 ± 1.8°
詳細資料
53 Eri A
質量	1.07 ± 0.25 M☉
半徑	9.8 R☉
表面重力 (log g)	2.49 ± 0.23
亮度	37 L☉
溫度	4603 K
金属量 [Fe/H]	-0.11 dex
其他命名
	BD−14° 933、FK5 172、GJ 9160、HD 29503、HIP 21594、HR 1481、SAO 149781
參考資料庫
SIMBAD	53 Eri
	53 Eri A
	53 Eri B

九斿增四（波江座53 ，也稱作波江座l）是在波江座的一顆恆星。這個系統的合成視星等為3.87等，甚至在市中心也能用肉眼直接看見^[8]。依據依巴谷太空船估計的視差，它與地球的距離大約是110光年，或是33.7秒差距^[1]。

九斿增四在西方的傳統名稱是Sceptrum，拉丁文是"scepter"^[9]。它在已廢棄星座勃蘭登王笏座中的標示為"p Sceptri "，是該星座中較亮的恆星。這個星座是戈特弗裡德·基爾希（英语：Gottfried Kirch）為紀念普魯士的勃蘭登堡所創建的，後來被約翰·波德使用在他的星圖上，但這個星座的使用率越來越低^[10]。

九斿增四是一對目視聯星，兩顆恆星的軌道是經由它們的軌道運動計算出來的。主星是已經演化成紅巨星，光譜類型為K1III^[4]。它的直徑大約是太陽的10倍，並且質量比太陽略多一些^[7]。伴星的視星等是6.95等^[3]，光譜類型還不知道。兩顆星的軌道週期是77年，並且有很大的離心率，其值為0.666^[3]，總質量為2.49 M_☉^[11]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F.; et al. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2017-12-22]. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2019-12-07）.
^ 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.
^ ^3.0 ^3.1 ^3.2 ^3.3 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [15 May 2017]. （原始内容存档于2017-08-01）.
^ ^4.0 ^4.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample. The Astronomical Journal. 2006, 132: 161. Bibcode:2006AJ....132..161G. arXiv:astro-ph/0603770 . doi:10.1086/504637.
^ ^5.0 ^5.1 Johnson, H. L. UBVRIJKL Photometry of the Bright Stars. Communications of the Lunar and Planetary Laboratory. 1966, 4: 99. Bibcode:1966CoLPL...4...99J.
^ ^6.0 ^6.1 ^6.2 ^6.3 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey. Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity. The Astronomical Journal. 2008, 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
^ ^7.0 ^7.1 ^7.2 ^7.3 Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 .
^ Bortle, John E. The Bortle Dark-Sky Scale. Sky & Telescope. Sky Publishing Corporation. February 2001 [15 May 2017]. （原始内容存档于2014-03-31）.
^ Barentine, John C. The Lost Constellations: A History of Obsolete, Extinct, or Forgotten Star Lore. New York, New York: Springer. 2015: 365 [2017-12-22]. （原始内容存档于2017-09-03）.
^ Ian Ridpath. Sceptrum Brandenburgicum. Star Tales. [15 May 2017]. （原始内容存档于2017-11-27）.
^ Söderhjelm, Staffan. Visual binary orbits and masses POST HIPPARCOS. Astronomy and Astrophysics. 1999, 341: 121–140. Bibcode:1999A&A...341..121S.

[HIP-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F.; et al. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2017-12-22]. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2019-12-07）.

[Ducati-2] 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.

[ORB6-3] 3.0 ^3.1 ^3.2 ^3.3 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [15 May 2017]. （原始内容存档于2017-08-01）.

[Gray-4] 4.0 ^4.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample. The Astronomical Journal. 2006, 132: 161. Bibcode:2006AJ....132..161G. arXiv:astro-ph/0603770 . doi:10.1086/504637.

[UBVRI-5] 5.0 ^5.1 Johnson, H. L. UBVRIJKL Photometry of the Bright Stars. Communications of the Lunar and Planetary Laboratory. 1966, 4: 99. Bibcode:1966CoLPL...4...99J.

[Massarotti-6] 6.0 ^6.1 ^6.2 ^6.3 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey. Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity. The Astronomical Journal. 2008, 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.

[AllendePrieto-7] 7.0 ^7.1 ^7.2 ^7.3 Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 .

[8] Bortle, John E. The Bortle Dark-Sky Scale. Sky & Telescope. Sky Publishing Corporation. February 2001 [15 May 2017]. （原始内容存档于2014-03-31）.

[barentine-9] Barentine, John C. The Lost Constellations: A History of Obsolete, Extinct, or Forgotten Star Lore. New York, New York: Springer. 2015: 365 [2017-12-22]. （原始内容存档于2017-09-03）.

[10] Ian Ridpath. Sceptrum Brandenburgicum. Star Tales. [15 May 2017]. （原始内容存档于2017-11-27）.

[Soderhjelm-11] Söderhjelm, Staffan. Visual binary orbits and masses POST HIPPARCOS. Astronomy and Astrophysics. 1999, 341: 121–140. Bibcode:1999A&A...341..121S.

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