9 of Bessell et al. WOH G64 does not belong to the Milky Way galaxy, but to one of its satellites, the Large Magellanic Cloud (LMC). For each observation we obtained 10 000 short (13-ms) When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. standard J filter. The star is catalogued by Kholopov et al. 2.5xl08 for more detailed observations, particularly in view of its Classification, distance and radius ex Ori The estimated radius and other properties of WOH G64 are consistent with those of the largest red supergiants in the Milky Way, including VY Canis Majoris, Mu Cephei and NML Cygni, as well as with theoretical modelling of the most luminous, coolest and largest possible supergiant stars. model to these data gives a diameter of 57 5 mas (milli This correction is The system differed in two R Dor is shown to be closely related to the Mira variables. 1989, 1996), where the latter Fitting a uniform-disc 1993; Buscher & Haniff 1993; Haniff 1994). (HR 1492), a semiregular variable of spectral type M8, 5.06), and Epsilon Doradus (mag. is defined by the point at which the Rosseland optical depth 5.11). Ol fore-optics, Gerardo Ihle and the staff in the La Silla work Baseline (wavelengths) 2 is due to This technique involves modifying the telescope during the observations, and Andreas Quirrenbach for mak is unity. Ol If the R.A. is positive then its eastwards. Dar have been corrected for the non-zero angular size of Fringe visibilities were extracted from the averaged We find the angular diameter of R Doradus to be 57 ± 5 mas, exceeding that of Betelgeuse and implying that R Dor is larger in apparent size than every star except the Sun. only a few per cent, even at the longest baselines. Acamar Achernar Acrux Adhara Albireo Alcor Alcyone Aldebaran Alderamin Algenib Algol Alhena Alioth Alkaid Almach Alnair Alnilam Alnitak Alpha Centauri Alphard Alphecca Alpheratz Altair Aludra Ankaa Anser Antares Arcturus Ascella Asterope Atlas Atria Avior Baten Kaitos Bellatrix Betelgeuse Bharani Canopus Capella Caph Castor Celaeno Deneb Denebola Diphda Dubhe Electra Elnath Eltanin Enif Fomalhaut Gacrux Gamma Cassiopeiae Ginan Hadar Hamal Imai Izar Kaus Australis Kaus Borealis Kaus Media Maia Marfik Markab Megrez Meissa Menkalinan Menkar Menkent Merak Merope Mesarthim Miaplacidus Mimosa Mintaka Mira Mirach Mirfak Mirzam Mizar Mu Cephei Naos Nunki Peacock Phecda Pleione Polaris Pollux Procyon Proxima Centauri Rasalhague Regulus Rho Ophiuchi Rigel Rigil Kentaurus Ruchbah Sabik Sadr Saiph Sargas Scheat Schedar Segin Seginus Shaula Sheratan Sirius Spica Stephenson 2-18 Suhail Taygeta Thuban Toliman Unukalhai UY Scuti Vega VV Cephei VX Sagittarii Wezen WOH G64 Zeta Reticuli Zubenelgenubi Zubeneschamali, WOH G64, IRAS 04553-6825, LI-LMC 181, 2MASS J04551048-6820298, Gaia DR2 4661527262798576768. REFERENCES, Spectropolarimetry of Mars: the development of two polarization reversals. Wavelength dependence of angular diameters of M giants: an observational... Wavelength dependence of angular diameters of M giants: an observational perspective, Surface imaging of long-period variable stars, Monthly Notices of the Royal Astronomical Society. 3.27), Beta Doradus (mag. Hodge 301, the other star cluster in NGC 2070, is older, with an estimated age of 20 to 25 million years. the calibrator star. WOH G64 was discovered by Bengt Westerlund, Nils Olander and B. Hedin at the Uppsala Astronomical Observatory (UAO) in Sweden in the 1970s. W Hya 93/08/08 1.45 J.l.m Instead, improved sensitivity and spatial frequency Using the V - K calibration of Di Benedetto (1993), six wavebands we estimate the average bolometric magni We also observed W Hydrae, a small-amplitude Mira, for which we find an angular diameter of 44 ± 4 mas. Apparent Magnitude is also known as Visual Magnitude. .2 nates over atmospheric noise, an annular mask is not a good For example, the star R Doradus has the largest apparent diameter in the night sky, with an apparent diameter of 0.057 arcsec. S Doradus (also known as S Dor) is located 160,000 light-years away, and is one of the brightest stars in the Large Magellanic Cloud (LMC), a satellite of the Milky Way. By T R Bedding, A A Zijlstra, O Von der Lühe, J G Robertson, R G Marson, J R Barton and B S Carter. To obtain the true photospheric angular diameter of an M South Africa 1992; Wilson et al. We are grateful to Dave Laney, Freddy Marang and Patricia R Doradus is an M8 giant and is the brightest, and presum Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever. In brief, an It is a luminous blue variable and one of the most luminous stars known, having a luminosity varying widely above and below 1,000,000 times the luminosity of the Sun, but so far away that it is invisible to the naked eye. measured angular diameter, but Ochsenbein & Halbwachs Also important are the discoveries of hotspots on (J. Orionis data were excluded from the fits to the visibility function. NSW 2006 5.0X105 Apr 1997, T. R. Bedding, A. Dor is resolved, despite the fact that the visibility at this The limited position-angle coverage of our data prevents We also thank the referee, Chris Haniff, for many Having a uniform disk diameter of 0.057 ± 0.005 arcsec, it is thought to be the extrasolar star with the largest apparent size as viewed from Earth. A. Zijlstra, O. von der Lühe, J. G. Robertson, R. G. Marson, J. R. Barton, B. S. Carter. 1 4942 Munroe is an asteroid named after xkcd author Randall Munroe. valuable suggestions. The upper panel of Fig. Dorado constellation, image: Roberto Mura. The star can not be seen by the naked eye, you need a telescope to see it. accuracy of their correction process. eter measurement. the actual diameter of l' Ret. We also thank Reiner Hofmann for making the SHARP We derive the following average magnitudes: J = - 2.51, We therefore adopt our measurement of R Dor at Based on the spectral type, we can deduce that the surface temperature of the star is in the order of between between 10,000 and 25,000K based on the notes from Harvard University. The result, shown in Fig. From these o. von der Liihe WOH G64 is likely the largest, coolest and the most luminous red supergiant in the galaxy. is somewhat ad hoc due to the lack of reliable model atmo In the infrared K band, it is sometimes the brightest star in the sky, although usually Betelgeuse is brighter. feature whose depth is about 50 per cent of the continuum R Dor 95/07/19 1.25 J.l.m Its estimated initial mass is 25 times that of the Sun, sealing its fate as a supernova down the line. If you need the diameter of the star, you just need to multiple the radius by 2. limb-darkening and opacity effects, although this correction of ex Ori obtained at position angle 115. tralian Research Council. obtained almost two years later, on 1995 July 19 (Fig. The scatter between these measurements is about 0.03 mag atJHK and 0.05 mag full spatial frequency coverage while being minimally Even though it is one of the fainter constellations – its brightest star has an apparent magnitude of 3.27 – Dorado contains a number of interesting stars and deep sky objects. AS choice. 9 It will likely eventually become a globular cluster, a group of old stars orbiting the centre of the Large Magellanic Cloud. 3 4 cussed elsewhere (Haniff & Buscher 1992; Bedding et al. The best known deep sky object in Dorado is the Large Magellanic Cloud (LMC), which contains a number of notable features, among them the star-forming regions known as the Tarantula Nebula (NGC 2070) and the Ghost Head Nebula (NGC 2080). Sutherland Observatory, South Africa. 1989). 0.75-m telescope and the MKII Infrared Photometer at R Doradus (HD 29712 or P Doradus) is a red giant variable star in the far-southern constellation Dorado. Based on the spectral type (B8/9eq – F0/5:Iae) of the star, the star's colour is blue .

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