小犬座YZ

**YZ Canis Minoris**
	; 小犬座YZ的光變曲線，主圖顯示了周期性的亮度變化和幾個耀斑。插圖顯示了具有擴展時間尺度的最強耀斑。
觀測資料; 曆元 J2000
星座	小犬座
星官
赤經	07h 44m 40.17230s
赤緯	+03° 33′ 08.8752″
視星等（V）	11.15
特性
光谱分类	M5 V
B−V 色指数	1.61
天体测定
徑向速度 (Rv)	+26.53±0.30 km/s
自行 (μ)	赤经：−347.782 mas/yr ; 赤纬：−445.702 mas/yr
视差 (π)	166.9769 ± 0.0343 mas
距离	19.533 ± 0.004 ly ; (5.989 ± 0.001 pc)
绝对星等 (MV)	12.32
詳細資料
質量	0.308 M☉
半徑	0.324 R☉
表面重力 (log g)	5.0
亮度	0.012 L☉
溫度	3,125±61 K
金属量 [Fe/H]	−0.26±0.08 dex
自轉	2.8 days
自轉速度 (v sin i)	4.0 km/s
年齡	49 Myr
其他命名
	YZ CMI、BD+35°2496、GJ 285、HIP 37766、SAO 63793、G 50-4、G 112-46、LFT 547、LHS 1943、LSPM J0744+0333、LTT 12064、NLTT 18373、PLX 1827、PM 07421+0341、Ross 882、TYC 183-2190-1、GSC 00183-02190、IRAS 07420+0340、2MASS J07444018+0333089
參考資料庫
SIMBAD	资料
	YZ 小犬座YZ在小犬座的位置;

天球赤道座標： 07^h 44^m 40.17262^s，+03° 33′ 08.8778″

小犬座YZ 是位於小犬座中的一顆紅色恆星。視星等為11.15^[2]，肉眼無法看到它。目前，這顆恆星正以+26.5公里/秒的日心徑向速度向更遠的地方移動。^[4]大約162,000年前，當它以10.2光年的距離通過近日點時，它最接近地球。^[12]小犬座YZ是繪架座β移動星群的潛在成員。^[13]

這是一顆紅矮星，恆星分類為M5V。^[3] 它也是耀星，因其恆星耀斑比太陽的耀斑更強大而得名，並且大約是木星大小的三倍。^[14]

參考[编辑]

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 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.
^ ^2.0 ^2.1 ^2.2 Astudillo-Defru, N.; et al. Magnetic activity in the HARPS M dwarf sample. The rotation-activity relationship for very low-mass stars through R'(HK). Astronomy & Astrophysics. April 2017, 600: 15. Bibcode:2017A&A...600A..13A. S2CID 119237202. arXiv:1610.09007 . doi:10.1051/0004-6361/201527078. A13.
^ ^3.0 ^3.1 West, Andrew A.; et al. An Activity-Rotation Relationship and Kinematic Analysis of Nearby Mid-to-Late-Type M Dwarfs. The Astrophysical Journal. October 2015, 812 (1): 12. Bibcode:2015ApJ...812....3W. S2CID 17434970. arXiv:1509.01590 . doi:10.1088/0004-637X/812/1/3. 3.
^ ^4.0 ^4.1 Nidever, David L.; et al. Radial Velocities for 889 Late-Type Stars. The Astrophysical Journal Supplement Series. August 2002, 141 (2): 503–522. Bibcode:2002ApJS..141..503N. S2CID 51814894. arXiv:astro-ph/0112477 . doi:10.1086/340570.
^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015.
^ ^6.0 ^6.1 ^6.2 Newton, Elisabeth R.; et al. The Hα Emission of Nearby M Dwarfs and its Relation to Stellar Rotation. The Astrophysical Journal. January 2017, 834 (1): 13. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509 . doi:10.3847/1538-4357/834/1/85. 85.
^ Lépine, Sébastien; et al. A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky. The Astronomical Journal. 2013, 145 (4): 102. Bibcode:2013AJ....145..102L. S2CID 117144290. arXiv:1206.5991 . doi:10.1088/0004-6256/145/4/102.
^ ^8.0 ^8.1 Gaidos, Eric; Mann, Andrew W. M dwarf metallicities and giant planet occurrence: ironing out uncertainties and systematics. The Astrophysical Journal. August 2014, 791 (1): 9. Bibcode:2014ApJ...791...54G. S2CID 118744016. arXiv:1406.4071 . doi:10.1088/0004-637X/791/1/54. 54.
^ Reiners, Ansgar; et al. The CARMENES search for exoplanets around M dwarfs. High-resolution optical and near-infrared spectroscopy of 324 survey stars. Astronomy and Astrophysics. 2018, 612: A49. Bibcode:2018A&A...612A..49R. S2CID 62818673. arXiv:1711.06576 . doi:10.1051/0004-6361/201732054.
^ Meshkat, Tiffany; et al. A Direct Imaging Survey of Spitzer-detected Debris Disks: Occurrence of Giant Planets in Dusty Systems. The Astronomical Journal. December 2017, 154 (6): 21. Bibcode:2017AJ....154..245M. S2CID 42042014. arXiv:1710.04185 . doi:10.3847/1538-3881/aa8e9a. 245.
^ YZ CMi. SIMBAD. 斯特拉斯堡天文資料中心.
^ Bailer-Jones, C. A. L. Close encounters of the stellar kind. Astronomy & Astrophysics. March 2015, 575: 13. Bibcode:2015A&A...575A..35B. S2CID 59039482. arXiv:1412.3648 . doi:10.1051/0004-6361/201425221. A35.
^ Nakajima, Tadashi; Morino, Jun-Ichi. Potential Members of Stellar Kinematic Groups within 30 pc of the Sun. The Astronomical Journal. January 2012, 143 (1): 2. Bibcode:2012AJ....143....2N. doi:10.1088/0004-6256/143/1/2 .
^ First flares on a distant star. New Scientist. February 4, 1982: 305.

[GaiaDR3-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 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.

[AstudilloDefru2017-2] 2.0 ^2.1 ^2.2 Astudillo-Defru, N.; et al. Magnetic activity in the HARPS M dwarf sample. The rotation-activity relationship for very low-mass stars through R'(HK). Astronomy & Astrophysics. April 2017, 600: 15. Bibcode:2017A&A...600A..13A. S2CID 119237202. arXiv:1610.09007 . doi:10.1051/0004-6361/201527078. A13.

[West2015-3] 3.0 ^3.1 West, Andrew A.; et al. An Activity-Rotation Relationship and Kinematic Analysis of Nearby Mid-to-Late-Type M Dwarfs. The Astrophysical Journal. October 2015, 812 (1): 12. Bibcode:2015ApJ...812....3W. S2CID 17434970. arXiv:1509.01590 . doi:10.1088/0004-637X/812/1/3. 3.

[Nidever2002-4] 4.0 ^4.1 Nidever, David L.; et al. Radial Velocities for 889 Late-Type Stars. The Astrophysical Journal Supplement Series. August 2002, 141 (2): 503–522. Bibcode:2002ApJS..141..503N. S2CID 51814894. arXiv:astro-ph/0112477 . doi:10.1086/340570.

[Anderson2012-5] Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015.

[Newton2017-6] 6.0 ^6.1 ^6.2 Newton, Elisabeth R.; et al. The Hα Emission of Nearby M Dwarfs and its Relation to Stellar Rotation. The Astrophysical Journal. January 2017, 834 (1): 13. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509 . doi:10.3847/1538-4357/834/1/85. 85.

[lepine2013-7] Lépine, Sébastien; et al. A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky. The Astronomical Journal. 2013, 145 (4): 102. Bibcode:2013AJ....145..102L. S2CID 117144290. arXiv:1206.5991 . doi:10.1088/0004-6256/145/4/102.

[Gaidos2014-8] 8.0 ^8.1 Gaidos, Eric; Mann, Andrew W. M dwarf metallicities and giant planet occurrence: ironing out uncertainties and systematics. The Astrophysical Journal. August 2014, 791 (1): 9. Bibcode:2014ApJ...791...54G. S2CID 118744016. arXiv:1406.4071 . doi:10.1088/0004-637X/791/1/54. 54.

[carmenes-9] Reiners, Ansgar; et al. The CARMENES search for exoplanets around M dwarfs. High-resolution optical and near-infrared spectroscopy of 324 survey stars. Astronomy and Astrophysics. 2018, 612: A49. Bibcode:2018A&A...612A..49R. S2CID 62818673. arXiv:1711.06576 . doi:10.1051/0004-6361/201732054.

[meshkat2017-10] Meshkat, Tiffany; et al. A Direct Imaging Survey of Spitzer-detected Debris Disks: Occurrence of Giant Planets in Dusty Systems. The Astronomical Journal. December 2017, 154 (6): 21. Bibcode:2017AJ....154..245M. S2CID 42042014. arXiv:1710.04185 . doi:10.3847/1538-3881/aa8e9a. 245.

[SIMBAD-11] YZ CMi. SIMBAD. 斯特拉斯堡天文資料中心.

[BailerJones2015-12] Bailer-Jones, C. A. L. Close encounters of the stellar kind. Astronomy & Astrophysics. March 2015, 575: 13. Bibcode:2015A&A...575A..35B. S2CID 59039482. arXiv:1412.3648 . doi:10.1051/0004-6361/201425221. A35.

[Nakajima2012-13] Nakajima, Tadashi; Morino, Jun-Ichi. Potential Members of Stellar Kinematic Groups within 30 pc of the Sun. The Astronomical Journal. January 2012, 143 (1): 2. Bibcode:2012AJ....143....2N. doi:10.1088/0004-6256/143/1/2 .

[First_flares-14] First flares on a distant star. New Scientist. February 4, 1982: 305.

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觀測資料曆元 J2000
小犬座YZ的光變曲線，主圖顯示了周期性的亮度變化和幾個耀斑。插圖顯示了具有擴展時間尺度的最強耀斑。
星座	小犬座
星官
赤經	07^h 44^m 40.17230^s^[1]
赤緯	+03° 33′ 08.8752″^[1]
視星等（V）	11.15^[2]
特性
光谱分类	M5 V^[3]
B−V 色指数	1.61^[2]
天体测定

徑向速度 (R_v)	7001265300000000000♠+26.53±0.30^[4] km/s
自行 (μ)	赤经：−347.782^[1] mas/yr 赤纬：−445.702^[1] mas/yr
视差 (π)	166.9769 ± 0.0343^[1] mas
距离	19.533 ± 0.004 ly (5.989 ± 0.001 pc)
绝对星等 (M_V)	12.32^[5]

詳細資料

質量	0.308^[6] M_☉
半徑	0.324^[6] R_☉
表面重力 (log g)	5.0^[7]
亮度	0.012^[1] L_☉
溫度	7003312500000000000♠3,125±61^[8] K
金属量 [Fe/H]	3000740000000000000♠−0.26±0.08^[8] dex
自轉	2.8^[6] days
自轉速度 (v sin i)	4.0^[9] km/s
年齡	49^[10] Myr

其他命名
YZ CMI、BD+35°2496、GJ 285、HIP 37766、SAO 63793、G 50-4、G 112-46、LFT 547、LHS 1943、LSPM J0744+0333、LTT 12064、NLTT 18373、PLX 1827、PM 07421+0341、Ross 882、TYC 183-2190-1、GSC 00183-02190、IRAS 07420+0340、2MASS J07444018+0333089^[11]
參考資料庫
SIMBAD	资料
YZ 小犬座YZ在小犬座的位置