List of stars with resolved images

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

List
This list is incomplete; you can help by adding missing items with reliable sources.
List of stars with resolved images
Star Image Diameter Distance
(ly)		 Imager Notes
Angular (mas) Geometric (Sun = 1)
The Sun 1 930 000 1 0.000 015 8
(1 AU)		 Resolvable with the naked eye;
see also solar telescope.		 Closest, brightest, and largest star by apparent diameter.
Proxima Centauri 1.02 ± 0.08 0.141 ± 0.007 4.246 ± 0.006 Very Large Telescope 2nd closest star.
Rigil Kentaurus (Alpha Centauri A) 8.511 ± 0.020 1.224 ± 0.003 4.37 Very Large Telescope - VINCI/VLTI[2]
Toliman (Alpha Centauri B) 6.001 ± 0.034 0.863 ± 0.005
Altair 3.2 1.66 ± 0.01 (polar)
2.02 ± 0.01 (equator)		 16.77 ± 0.08 CHARA array - MIRC[3]
Rasalhague (Alpha Ophiuchi A) 1.62 ± 0.03 2.39 ± 0.01 (polar)
2.87 ± 0.02 (equator)		 48.6 ± 0.8 CHARA array - MIRC[4]
Alderamin (Alpha Cephei) 1.35 ± 0.02 (polar)
1.75 ± 0.03 (equatorial)		 2.20 ± 0.04 (polar)
2.74 ± 0.04 (equator)		 48.8 ± 0.36 CHARA array - MIRC[4]
Caph (Beta Cassiopeiae) 1.70 ± 0.04 3.1 ± 0.1 (polar)
3.8 ± 0.1 (equator)		 54.7 ± 0.3 CHARA array - MIRC[5]
Regulus (Alpha Leonis A) 1.24 ± 0.02 3.2 ± 0.1 (polar)
4.2 ± 0.1 (equator)		 79.3 ± 0.7 CHARA array - MIRC[5]
Algol Aa1 (Beta Persei Aa1)
(stationary object)		 0.88 ± 0.05 4.13 93 ± 2 CHARA array - MIRC[6]
Algol Aa2 (Beta Persei Aa2)
(orbiting object)		 1.12 ± 0.07 3
Algol Ab (Beta Persei Ab) 0.56 ± 0.10 0.9 Observed radius of Algol Ab is an instrumental artifact,
caused by bandwidth smearing. Actual radius is 1.73 ± 0.33 R☉.
Zeta Andromedae Aa 2.502 ± 0.008 15.0 ± 0.8 (polar) 189 ± 3 CHARA array - MIRC[7][8] First direct imaging of starspots on a star outside the Solar System.
R Doradus 57 ± 5 370 ± 50 204 ± 9 New Technology Telescope[9] 2nd largest known star by apparent diameter in Earth's sky,
after the Sun.
Mira (Omicron Ceti) 50 up to 700 420 Hubble - FOC[10]
T Leporis 5.8
15 for molecular layer		 100 500 Very Large Telescope - VLTI[11]/AMBER[12]
Pi1 Gruis 18.37 694 530 Very Large Telescope - PIONIER[13] First directly observed granulation patterns on a star's surface
outside the Solar System.
Antares 41.3 ± 0.1 700 620 Very Large Telescope - VLTI/AMBER[14]
Betelgeuse 50 630 643 ± 146
Sheliak A (Beta Lyrae A) 0.46 6 960 ± 50 CHARA array - MIRC[18]
Theta1 Orionis C 0.2 10.6 ± 1.5 1400 Very Large Telescope - AMBER[19],
GRAVITY[20]
Almaaz A (Epsilon Aurigae A) 2.27 3.7 ± 0.7 ca. 2000 CHARA array - MIRC[21]
Almaaz B (Epsilon Aurigae B) 5.9 ± 0.1
This list is incomplete; you can help by adding missing items with reliable sources.

See also

References
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  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. M. Zhao; et al. (2009). "Imaging And Modeling Rapidly Rotating Stars: Alpha Cephei And Alpha Ophiuchi". The Astrophysical Journal. 701 (1): 209–224. arXiv:0906.2241. Bibcode:2009ApJ...701..209Z. doi:10.1088/0004-637X/701/1/209.
  5. X. Che; et al. (2011). "Colder And Hotter: Interferometric Imaging Of Beta Cassiopeiae And ?lpha Leonis". The Astrophysical Journal. 732 (2): 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.
  7. Kővári, Zs.; Bartus, J.; Strassmeier, K. G.; Oláh, K.; Weber, M.; Rice, J. B.; Washuettl, A. (2007). "Doppler imaging of stellar surface structure. XXIII. The ellipsoidal K giant binary ζ Andromedae". Astronomy and Astrophysics. 463 (3): 1071. arXiv:1301.0445. Bibcode:2007A&A...463.1071K. doi:10.1051/0004-6361:20065982.
  8. Roettenbacher, R.M.; Monnier, J.D.; Korhonen, H.; Aarnio, A.N.; Baron, F.; Che, X.; Harmon, R.O.; Kővári, Zs.; Kraus, S.; Schaefer, G.H.; Torres, G.; Zhao, M.; Ten Brummelaar, T.A.; Sturmann, J.; Sturmann, L. (2016). "No Sun-like dynamo on the active star ζ Andromedae from starspot asymmetry". Nature. 533 (7602): 217–220. arXiv:1709.10107. Bibcode:2016Natur.533..217R. doi:10.1038/nature17444. PMID 27144357.
  9. "The Biggest Star in the Sky". ESO. March 11, 1997. Retrieved 2010-06-26.
  10. "Hubble Separates Stars in the Mira Binary System". HubbleSite. 6 August 1997. Retrieved 26 June 2017.
  11. "Hundred metre virtual telescope captures unique detailed colour image". European Southern Observatory. 18 February 2009. Retrieved 26 June 2017.
  12. 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.
  13. "Giant Bubbles on Red Giant Star's Surface". www.eso.org. Retrieved 22 December 2017.
  14. "Astronomers Capture Best-Ever Image of Alien Star". Scientific American. 24 August 2017. Retrieved 27 August 2017.
  15. "Betelgeuse captured by ALMA". European Southern Observatory. 26 June 2017. Retrieved 26 June 2017.
  16. "Sharpest views of Betelgeuse reveal how supergiant stars lose mass". European Southern Observatory. 29 July 2009. Retrieved 26 June 2017.
  17. "The Flames of Betelgeuse". European Southern Observatory. 23 June 2011. Retrieved 26 June 2017.
  18. M. Zhao; et al. (2008). "First Resolved Images Of The Eclipsing And Interacting Binary Beta Lyrae". The Astrophysical Journal. 684 (2): L95–L98. arXiv:0808.0932. Bibcode:2008ApJ...684L..95Z. doi:10.1086/592146.
  19. "The orbit of Theta1 Orionis C". European Southern Observatory. 18 February 2009. Retrieved 26 June 2017.
  20. "GRAVITY discovers new double star in Orion Trapezium cluster". European Southern Observatory. 13 January 2016. Retrieved 26 June 2017.
  21. 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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