List of stars with resolved images

The following is a list of stars whose images have been resolved beyond a point source. Aside from the Sun, stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment to image. For example, the first star, other than the Sun, to be directly imaged was Betelgeuse. It has an angular diameter of only 50 milliarcseconds (mas).[1]

List

This list is incomplete; you can help by expanding it.
Star Image Angular diameter Radius (R☉) Distance Imager Notes
The Sun 30 arcminutes 1 1 au Resolvable with the naked eye; see also solar telescope.
Proxima Centauri 1.02 ± 0.08 mas 0.141 ± 0.007 4.246 ± 0.006 ly Very Large Telescope
Alpha Centauri 8.511 ± 0.020 mas (A component)
6.001 ± 0.034 mas (B component)		 1.224 ± 0.003 (A component)
0.863 ± 0.005 (B component)		 4.37 ly Very Large Telescope - VINCI/VLTI[2] Nearest star system visible with naked eye.
Altair 3.2 mas 1.66 ± 0.01 (polar)
2.02 ± 0.01 (equator)		 16.77 ± 0.08 ly CHARA array - MIRC[3]
Rasalhague (Alpha Ophiuchi A) 1.62 ± 0.03 mas 2.39 ± 0.01 (polar)
2.87 ± 0.02 (equator)		 48.6 ± 0.8 ly CHARA array - MIRC[4]
Alderamin (Alpha Cephei) 1.35 ± 0.02 mas (polar)
1.75 ± 0.03 mas (equatorial)		 2.20 ± 0.04 (polar)
2.74 ± 0.04 (equator)		 48.8 ± 0.36 ly CHARA array - MIRC[4]
Beta Cassiopeiae 1.70 ± 0.04 mas 3.1 ± 0.1 (polar)
3.8 ± 0.1 (equator)		 54.7 ± 0.3 ly CHARA array - MIRC[5]
Regulus (Alpha Leonis A) 1.24 ± 0.02 mas 3.2 ± 0.1 (polar)
4.2 ± 0.1 (equator)		 79.3 ± 0.7 ly CHARA array - MIRC[5]
Algol (Beta Persei) 0.88 ± 0.05 mas (Aa1 component)
1.12 ± 0.07 mas (Aa2 component)
0.56 ± 0.10 mas (Ab component)		 4.13 (Aa1 component)
3 (Aa2 component)
0.9 (Ab component)		 93 ± 2 ly CHARA array - MIRC[6] Observed radius of component Ab is an instrumental artifact, caused by bandwidth smearing. Actual radius is 1.73 ± 0.33 R☉.
R Doradus 57 ± 5 mas 370 ± 50 204 ± 9 ly New Technology Telescope[7] Has the largest known apparent diameter of any star in Earth's sky, other than the Sun.
Mira (Omicron Ceti) 50 mas up to 700 420 ly Hubble - FOC[8]
T Leporis 5.8 mas (15 for molecular layer) 100 500 ly Very Large Telescope - VLTI[9]/AMBER[10]
Pi1 Gruis 18.37 mas 694 530 ly Very Large Telescope - PIONIER[11] First directly observed granulation patterns on the surface of a star outside the Solar System.
Antares 41.3 ± 0.1 mas 700 620 ly Very Large Telescope - VLTI/AMBER[12]
Betelgeuse 50 mas 630 643 ± 146 ly
Beta Lyrae 0.46 mas (A component) 6 (A component) 960 ± 50 ly CHARA array - MIRC[16]
Theta1 Orionis C 0.2 mas 10.6 ± 1.5 1400 ly Very Large Telescope - AMBER[17], GRAVITY[18]
Epsilon Aurigae 2.27 mas (A component) 3.7 ± 0.7 (A component)
5.9 ± 0.1 (B component)		 ca. 2000 ly CHARA array - MIRC[19]
This list is incomplete; you can help by expanding it.

See also

References

  1. 1 2 H.Uitenbroek; Dupree, A. K.; Gilliland, R. L. (1998). "Spatially Resolved Hubble Space Telescope Spectra of the Chromosphere of alpha Orionis". Astronomical Journal. 116 (5): 2501. Bibcode:1998AJ....116.2501U. doi:10.1086/300596.
  2. ↑ P. Kervella, F. Thevenin, D. Segransan, G. Berthomieu, B. Lopez, P. Morel, J. Provost, The diameters of Alpha Centauri A and B - A comparison of the asteroseismic and VINCI/VLTI views, Astronomy and Astrophysics 404 3 (2003) 1087–1097.
  3. ↑ J.D. Monnier; et al. (2007). "Imaging the Surface of Altair". Science. 317 (5836): 342–5. arXiv:0706.0867. Bibcode:2007Sci...317..342M. doi:10.1126/science.1143205. PMID 17540860.
  4. 1 2 M. Zhao; et al. (2009). "Imaging And Modeling Rapidly Rotating Stars: Alpha Cephei And Alpha Ophiuchi". The Astrophysical Journal. 701: 209. arXiv:0906.2241. Bibcode:2009ApJ...701..209Z. doi:10.1088/0004-637X/701/1/209.
  5. 1 2 X. Che; et al. (2011). "Colder And Hotter: Interferometric Imaging Of Beta Cassiopeiae And ?lpha Leonis". The Astrophysical Journal. 732: 68. arXiv:1105.0740. Bibcode:2011ApJ...732...68C. doi:10.1088/0004-637X/732/2/68.
  6. ↑ Baron, F.; Monnier, J.; Pedretti, E.; Zhao, M.; Schaefer, G.; Parks, R.; Che, X.; Thureau, N.; ten Brummelaar, T. A.; McAlister, H. A.; Ridgway, S. T.; Farrington, C.; Sturmann, J.; Sturmann, L.; Turner, N. (2012). "Imaging the Algol Triple System in the H Band with the CHARA Interferometer". The Astrophysical Journal. 752 (1): 20. arXiv:1205.0754. Bibcode:2012ApJ...752...20B. doi:10.1088/0004-637X/752/1/20. Retrieved 18 February 2015.
  7. ↑ "The Biggest Star in the Sky". ESO. March 11, 1997. Retrieved 2010-06-26.
  8. ↑ "Hubble Separates Stars in the Mira Binary System". HubbleSite. 6 August 1997. Retrieved 26 June 2017.
  9. ↑ "Hundred metre virtual telescope captures unique detailed colour image". European Southern Observatory. 18 February 2009. Retrieved 26 June 2017.
  10. ↑ J.-B. Le Bouquin, S. Lacour, S. Renard, E. Thiébaut, A. Merand, T. Verhoelst, Pre-maximum spectro-imaging of the Mira star T Leporis with AMBER/VLTI, Astronomy and Astrophysics Volume 496, Number 1, March II 2009, L1-L4.
  11. ↑ "Giant Bubbles on Red Giant Star's Surface". www.eso.org. Retrieved 22 December 2017.
  12. ↑ "Astronomers Capture Best-Ever Image of Alien Star". Scientific American. 24 August 2017. Retrieved 27 August 2017.
  13. ↑ "Betelgeuse captured by ALMA". European Southern Observatory. 26 June 2017. Retrieved 26 June 2017.
  14. ↑ "Sharpest views of Betelgeuse reveal how supergiant stars lose mass". European Southern Observatory. 29 July 2009. Retrieved 26 June 2017.
  15. ↑ "The Flames of Betelgeuse". European Southern Observatory. 23 June 2011. Retrieved 26 June 2017.
  16. ↑ M. Zhao; et al. (2008). "First Resolved Images Of The Eclipsing And Interacting Binary Beta Lyrae". The Astrophysical Journal. 684: L95. arXiv:0808.0932. Bibcode:2008ApJ...684L..95Z. doi:10.1086/592146.
  17. ↑ "The orbit of Theta1 Orionis C". European Southern Observatory. 18 February 2009. Retrieved 26 June 2017.
  18. ↑ "GRAVITY discovers new double star in Orion Trapezium cluster". European Southern Observatory. 13 January 2016. Retrieved 26 June 2017.
  19. ↑ B. Kloppenborg; et al. (2010). "Infrared images of the transiting disk in the Epsilon Aurigae system". Nature. 464 (7290): 370–2. arXiv:1004.2464. Bibcode:2010Natur.464..870K. doi:10.1038/nature08968. PMID 20376144.
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