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List of stars with resolved images

Summary

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 resolved, has an angular diameter of only 50 milliarcseconds (mas).[1]

List

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List of stars with resolved images
Star Image Diameter Distance
(ly) 		First imager Year Notes
Angular (mas) Geometric (R☉)
Sun   2000000 1 0.0000158 Louis Fizeau and Léon Foucault[2] 1845
Altair
α Aql 		  3.2 1.66±0.01 (polar)
2.02±0.01 (equator) 		16.77±0.08 CHARA array – MIRC[3] 2006
Rasalhague
α Oph A 		1.62±0.03 2.39±0.01 (polar)
2.87±0.02 (equator) 		48.6±0.8 CHARA array – MIRC[4] 2006
Alderamin
α Cep 		1.35±0.02 (polar)
1.75±0.03 (equator) 		2.20±0.04 (polar)
2.74±0.04 (equator) 		48.8±0.36 CHARA array – MIRC[4] 2006
Caph
β Cas 		1.70±0.04 3.1±0.1 (polar)
3.8±0.1 (equator) 		54.7±0.3 CHARA array – MIRC[5] 2007
Regulus
α Leo Aa 		1.24±0.02 3.2±0.1 (polar)
4.2±0.1 (equator) 		79.3±0.7 CHARA array – MIRC[5] 2008
Algol
β Per Aa1 		 
  		0.88±0.05 4.13 93±2 CHARA array – MIRC[6] 2006 stationary object in the animation
β Per Aa2 1.12±0.07 3 orbiting object in the animation
β Per 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☉.
Alkaid
η UMa 		0.834±0.060 2.86±0.21 103.9±0.8 CHARA array[7] 2012
Markab
α Peg 		1.052±0.066 4.62±0.29 133±1 CHARA array[7] 2012
Elnath
β Tau 		1.09±0.076 4.82±0.34 134±2 CHARA array[7] 2012
SU Per 3.53±0.09[8] 1044+31
−21–1139+34
−23[9] 		7,250+470
−420[10] 		CHARA array[8] 2015
σ Gem A 2.425 10.1±0.4 126±2 CHARA array/MIRC[11] 2011 The star contains starspots on its surface
ζ And Aa 2.502±0.008 15.0±0.8 (polar) 189±3 CFHT[12][13] 1996 First direct imaging of starspots on a star outside the Solar System.
R Dor
 
 57±5 370±50 204±9 New Technology Telescope[14] 1993 2nd largest known star by apparent diameter in Earth's sky, after the Sun.
Mira
ο Cet A 		  28.9–34.9[15] 332–402[15] 420 Hubble – FOC[16] 1997
Polaris
α UMi Aa
 
 3.143±0.027 46.27±0.42 446±1 CHARA array[17] 2024
T Lep   5.8
15 for molecular layer 		100 500 Very Large Telescope – VLTI[18]/AMBER[19] 2009
π1 Gru   21[20] 370[20] 535[20] Very Large Telescope – VLTI/PIONIER[21] 2017 First directly observed granulation patterns on a star's surface outside the Solar System.
Antares
α Sco A 		  41.3±0.1 680[22] 553[23] Very Large Telescope – VLTI/AMBER[24][25] 2017
R Car 10.23±0.05–13.77±0.14 400–540 590±40 Very Large Telescope – PIONIER[26] 2014[a]
Betelgeuse
α Ori 		  50 640[27]–764[28] 643±146 Hubble – GHRS[1] 1995 First star with a resolved image outside the Solar System.
Sheliak
β Lyr Aa 		  0.46 6 960±50 CHARA array – MIRC[29] 2007 Both Aa1 and Aa2 are visible in the animation.
R Scl   8.9±0.3 355±55 1180±140 Very Large Telescope – AMBER[30] 2017
θ1 Ori C   0.2 10.6±1.5 1400 Very Large Telescope – AMBER[31] 2009 In the image, the right inset is θ1 Ori C and the left inset is θ1 Ori F.
θ1 Ori F Very Large Telescope – VLTI/GRAVITY[32] 2016
ε Aur 2.22±0.10[33] 143–358[33] 2000–4800[33] CHARA array – MIRC[34] 2009 Supergiant with an eclipsing companion surrounded by a massive, opaque debris disk
AZ Cyg 4.05±0.01 911+57
−50 		6820+420
−380 		CHARA array – MIRC[35] 2011[b]
ρ Cas
 
 2.09±0.02 564-700 8150±1630 CHARA array[36] 2024
RW Cep   2.45 1100±44 [37] 11000+4600
−2600–22000+5200
−3300 		CHARA array – MIRC-X and MYSTIC[38] 2022 Hypergiant star currently undergoing a great dimming event
HR 5171 Aa   4.1±0.8 1060–1160[39] 11740±1630 Very Large Telescope – VLTI/PIONIER[40] 2014 Eclipsing and potential contact binary yellow hypergiant
WOH G64   800[41] ca. 160 000 Very Large Telescope – VLTI/GRAVITY[42] 2024 Star is in the Large Magellanic Cloud. First resolved image of star outside of the Milky Way.

See also

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Notes

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  1. ^ Published 2024 based on observations from 2014 and 2020
  2. ^ First peer-reviewed publication in 2021, based on observations from 2011-2016

References

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