HD 168625

**HD 168625**
	; HD 168625 is the left star of the pair below the Omega Nebula. The other is the hypergiant HD 168607.
觀測資料; 曆元 J2000
星座	人馬座
星官
赤經	18h 21m 19.548s
赤緯	-16° 22′ 16.0572″
視星等（V）	8.30–8.41
特性
光谱分类	B6Ia+ (B2—B8) May be B60 due to hypergiant designation
U−B 色指数	+0.37
B−V 色指数	+1.41
J−K 色指数	0.599
变星类型	天鵝座α型變星
天体测定
徑向速度 (Rv)	−4.00 km/s
自行 (μ)	赤经：−0.71±1.20 mas/yr ; 赤纬：+0.01±0.74 mas/yr
视差 (π)	0.6212 ± 0.0640 mas
距离	approx. 5,300 ly ; (approx. 1,600 pc)
绝对星等 (MV)	−8.39
詳細資料
半徑	105 R☉
表面重力 (log g)	1.74
亮度	380,000 L☉
溫度	14,000 K
自轉速度 (v sin i)	60 km/s
其他命名
	V4030 Sgr, HD 168625, BD −16°4830, SAO 161375, HIP 89963, AAVSO 1815-168
參考資料庫
SIMBAD	资料

HD 168625是一顆藍色特超巨星，也是亮藍變星候選者，位於人馬座，人們如果使用業餘望遠鏡可以很容易看到它。它與藍色超巨星（藍色變星）HD 168607形成雙星，位於M17（歐米茄星雲）的東南方。

距離

天文學家對於HD 168625的距離多遠還有它與歐米茄星雲、HD 168607之間的關聯尚存疑問；雖然有些人認為這兩顆恆星在物理上是相關的，也都屬於OB星協巨蛇座OB1，距離太陽的距離為2.2千秒差距（7,200 ly）^[9]，根據蓋亞數據兩者的距離約為1.6千秒差距（ 5,200 ly）^[8]。2002年的一項研究估計這顆恆星距離太陽約為2.8 千秒差距（9,100 ly），與其他兩個天體無關^[10]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.
^ Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.
^ Chentsov, E. L.; Ermakov, S. V.; Klochkova, V. G.; Panchuk, V. E.; Bjorkman, K. S.; Miroshnichenko, A. S. An atlas of spectra of B6-A2 hypergiants and supergiants from 4800 to 6700Å. Astronomy and Astrophysics. 2003, 397 (3): 1035–1042. Bibcode:2003A&A...397.1035C. doi:10.1051/0004-6361:20021430 .
^ ^4.0 ^4.1 ^4.2 Mahy, L.; Hutsemékers, D.; Royer, P.; Waelkens, C. Tracing back the evolution of the candidate LBV HD168625. Astronomy & Astrophysics. 2016, 594: A94. Bibcode:2016A&A...594A..94M. S2CID 119243390. arXiv:1608.01087 . doi:10.1051/0004-6361/201628584.
^ ^5.0 ^5.1 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: 0. Bibcode:2002yCat.2237....0D.
^ Sterken, C.; Arentoft, T.; Duerbeck, H. W.; Brogt, E. Light variations of the blue hypergiants HD 168607 and HD 168625 (1973-1999). Astronomy and Astrophysics. 1999, 349: 532. Bibcode:1999A&A...349..532S.
^ 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): 889–896. Bibcode:2007AN....328..889K. S2CID 119323941. arXiv:0705.0878 . doi:10.1002/asna.200710776.
^ ^8.0 ^8.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
^ Nazé, Y.; Rauw, G.; Hutsemékers, D. The first X-ray survey of Galactic luminous blue variables. Astronomy & Astrophysics. 2012, 538: A47. Bibcode:2012A&A...538A..47N. S2CID 43688343. arXiv:1111.6375 . doi:10.1051/0004-6361/201118040. A47.
^ Pasquali, A.; Nota, A.; Smith, L.J.; Akiyama, S.; Messineo, M.; Clampin, M. Multiwavelength Study of the Nebula Associated with the Galactic LBV Candidate HD 168625. The Astronomical Journal. 2002, 124 (3): 1625–1635. Bibcode:2002AJ....124.1625P. S2CID 118968760. arXiv:astro-ph/0207613 . doi:10.1086/341820.

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引用错误：在<references>标签中name属性为“Smith2007”的参考文献没有在文中使用

[hipparcos-1] 1.0 ^1.1 ^1.2 ^1.3 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.

[gcvs-2] Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.

[chentsov-3] Chentsov, E. L.; Ermakov, S. V.; Klochkova, V. G.; Panchuk, V. E.; Bjorkman, K. S.; Miroshnichenko, A. S. An atlas of spectra of B6-A2 hypergiants and supergiants from 4800 to 6700Å. Astronomy and Astrophysics. 2003, 397 (3): 1035–1042. Bibcode:2003A&A...397.1035C. doi:10.1051/0004-6361:20021430 .

[mahy-4] 4.0 ^4.1 ^4.2 Mahy, L.; Hutsemékers, D.; Royer, P.; Waelkens, C. Tracing back the evolution of the candidate LBV HD168625. Astronomy & Astrophysics. 2016, 594: A94. Bibcode:2016A&A...594A..94M. S2CID 119243390. arXiv:1608.01087 . doi:10.1051/0004-6361/201628584.

[ducati-5] 5.0 ^5.1 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: 0. Bibcode:2002yCat.2237....0D.

[sterken-6] Sterken, C.; Arentoft, T.; Duerbeck, H. W.; Brogt, E. Light variations of the blue hypergiants HD 168607 and HD 168625 (1973-1999). Astronomy and Astrophysics. 1999, 349: 532. Bibcode:1999A&A...349..532S.

[KharchenkoScholz2007-7] 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): 889–896. Bibcode:2007AN....328..889K. S2CID 119323941. arXiv:0705.0878 . doi:10.1002/asna.200710776.

[dr2-8] 8.0 ^8.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录

[Naze2011-9] Nazé, Y.; Rauw, G.; Hutsemékers, D. The first X-ray survey of Galactic luminous blue variables. Astronomy & Astrophysics. 2012, 538: A47. Bibcode:2012A&A...538A..47N. S2CID 43688343. arXiv:1111.6375 . doi:10.1051/0004-6361/201118040. A47.

[Pasquali2002-10] Pasquali, A.; Nota, A.; Smith, L.J.; Akiyama, S.; Messineo, M.; Clampin, M. Multiwavelength Study of the Nebula Associated with the Galactic LBV Candidate HD 168625. The Astronomical Journal. 2002, 124 (3): 1625–1635. Bibcode:2002AJ....124.1625P. S2CID 118968760. arXiv:astro-ph/0207613 . doi:10.1086/341820.

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觀測資料曆元 J2000
HD 168625 is the left star of the pair below the Omega Nebula. The other is the hypergiant HD 168607.
星座	人馬座
星官
赤經	18^h 21^m 19.548^s^[1]
赤緯	-16° 22′ 16.0572″^[1]
視星等（V）	8.30–8.41^[2]
特性
光谱分类	B6Ia⁺^[3] (B2—B8^[4]) May be B60 due to hypergiant designation
U−B 色指数	+0.37^[5]
B−V 色指数	+1.41^[5]
J−K 色指数	0.599
变星类型	天鵝座α型變星^[6]
天体测定

徑向速度 (R_v)	−4.00^[7] km/s
自行 (μ)	赤经：3000290000000000000♠−0.71±1.20^[1] mas/yr 赤纬：6998100000000000000♠+0.01±0.74^[1] mas/yr
视差 (π)	0.6212 ± 0.0640^[8] mas
距离	approx. 5,300 ly (approx. 1,600 pc)
绝对星等 (M_V)	−8.39^[4]

詳細資料 ^{^[4]}

半徑	105 R_☉
表面重力 (log g)	1.74
亮度	380,000 L_☉
溫度	14,000 K
自轉速度 (v sin i)	60 km/s

其他命名
V4030 Sgr, HD 168625, BD −16°4830, SAO 161375, HIP 89963, AAVSO 1815-168
參考資料庫
SIMBAD	资料