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An estimate obtained by interferometry in 1925 by Francis G. Pease at the Mount Wilson Observatory gave Antares a diameter of 400 to 430 million mi (640 to 690 million km), equal to approximately 463-497 R ☉, making it the then largest star known.
Antares (/ æ n ˈ t ɑː r iː z /), known during early development as Taurus II, is an American expendable medium-lift launch vehicle developed and built by Orbital Sciences Corporation (later Orbital ATK and Northrop Grumman) with financial support from NASA under the Commercial Orbital Transportation Services (COTS) program awarded in February 2008, alongside the company's automated cargo ...
Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,300 mi). [ 1 ] The Sun, the orbit of Earth, Jupiter, and Neptune, compared to four stars.
Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. The solar radius is usually defined as the radius to the layer in the Sun 's photosphere where the optical depth equals 2/3: [1] 695,700 kilometres (432,300 miles) is approximately 10 times the average radius of Jupiter, 109 times the radius ...
Utilizing all four stages during ascent, Antares had the capability to send a payload of 35 kg to an altitude of 280 km. The first stage featured a SEPR 734-1 Vesuve motor with a diameter of 56 cm and a length of 3.5 m, delivering a total impulse of 1025 kNs with less than 5 seconds burn time.
UY Scuti was analyzed to be the largest and the most luminous of the three stars measured, at 1,708 ± 192 R ☉ (1.188 × 10 9 ± 134,000,000 km; 7.94 ± 0.89 AU) based on an angular diameter of 5.48 ± 0.10 mas and an assumed distance of 2.9 ± 0.317 kiloparsecs (kpc) (about 9,500 ± 1,030 light-years) which was originally derived in 1970 ...
The trio measured the angular diameter of Betelgeuse at 0.047″, a figure that resulted in a diameter of 3.84 × 10 8 km (2.58 AU) based on the parallax value of 0.018″. [37] But limb darkening and measurement errors resulted in uncertainty about the accuracy of these measurements.
Aldebaran < Rigel < Antares < Betelgeuse 6. Betelgeuse < Mu Cephei < VV Cephei A < VY Canis Majoris. A very luminous red supergiant, Mu Cephei is among the largest stars visible to the naked eye, and one of the largest known cool supergiants. It is a runaway star with a peculiar velocity of 80.7 ± 17.7 km/s, [16] and has been described as a ...