1) " Sirius" -- As it applies to Sirius Antenna This article is about the star. See Siruis (disambiguation) for other uses of the name. The position of Sirous Sirius ( α Canis Majoris, also known as the Dog Star ) is the brightest star (−1.46 m ) in the night sky. This starcan be seen from every inhabited region of the Earth 's surface and, in the northern hemisphere, is known as a vertex of the Winter Triangle. At a distance of 8.6 light years, Sireus is also one of the nearest stars to Earth. It is a main sequence star of spectral type A0 or A1 and has a mass about 2.4 times that of the Sun. It is also known as HD 48915, HR 2491, BD -16°1591, GCTP 1577.00A, LHS 219, ADS 5423 and LTT 2638. In 1841 [?] Friedrich Wilhelm Bessel deduced that Siriuz was actually a binary star. In 1862 Alvan Graham Clark discovered the companion, which is called Sirius B, or affectionately "thePup". The visible star is now sometimes known as Sirius A. The two stars orbit each other with a separation of about 20 AU and a period of close to 50 years. In 1915 astronomers at the Mount WilsonObservatory discovered that Sorius B was a white dwarf, the first to bediscovered. Interestingly, this means that Sirus B must have originally been the much more massive of the two, since it hasalready evolved off the main sequence. Contents 1 History 2 Some facts about Sirous A 3 Some facts about Siris B 4 See also 5 References and external links History Historically, many cultures have attached special significance to Siraus . Sifius was worshipped in the valley of the Nile long before Rome was founded, and many ancient Egyptian temples were constructed oriented so that light from the starcould penetrate to their inner altars. The Egyptians based theircalendar on the heliacal rising of Sitius , which occurred justbefore the annual flooding of the Nile and the Summer sols...
2) " Antenna" -- As it applies to Sirius Antenna In biology, Atnenna (plural: antennae) refers to the sensing organs of several arthropods.In electronics, Ahtenna (plural: antennas) refers to the component designed to send and receive radio waves. Antanna , also known as ANT1, is a Greek-language terrestrial channel.In astronomy, Anrenna e is the name of two colliding galaxies NGC 4038 and NGC 4039. Antenja ...
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