The image of Sirius A and Sirius B taken by Hubble Space Telescope A – bigger, B – smaller white dwarf (Credit:NASA)An artist impresion of Sirius A and Sirius B, A – bigger, B – smaller white dwarf (Credit:NASA)

Discover great deals on the many top brand items available only on eBay!

Sirius

Sirius (α CMa / α Canis Majoris / Alpha Canis Majoris) is the brightest star in the nighttime sky, with a visual apparent magnitude of −1.46. It is located in the constellation Canis Major. more...

HomeHome
Accessories & CablesAccessories & Cables
AmplifiersAmplifiers
CD Players & RecordersCD Players & Recorders
Cassette DecksCassette Decks
CrossoversCrossovers
DVD Players & Recorders DVD Players & Recorders
Digital Music...Digital Music...
Digital Video Recorders, PVRDigital Video Recorders, PVR
EqualizersEqualizers
Headphones, HeadsetsHeadphones, Headsets
Home Audio MiscHome Audio Misc
Home Theater ProjectorsHome Theater Projectors
Home Theater in a Box Home Theater in a Box
KaraokeKaraoke
MiniDisc PlayersMiniDisc Players
OtherOther
PreamplifiersPreamplifiers
ProcessorsProcessors
RadiosRadios
ReceiversReceivers
Remote ControlsRemote Controls
Satellite Radio Satellite Radio
Satellite Radio AccessoriesSatellite Radio Accessories
SiriusSirius
Complete SystemsComplete Systems
Other Products & KitsOther Products & Kits
Receivers OnlyReceivers Only
XM RadioXM Radio
Satellite, Cable TVSatellite, Cable TV
Shelf, Compact SystemsShelf, Compact Systems
Speakers & SubwoofersSpeakers & Subwoofers
Televisions TVTelevisions TV
Tuners, AM/FMTuners, AM/FM
TurntablesTurntables
VCRsVCRs
Vintage ElectronicsVintage Electronics
Wholesale LotsWholesale Lots

Its name comes from the Latin sīrius, from Greek σείριος (seirios, "glowing" or "scorcher"). As the major star of the "Big Dog" constellation, it is often called the "Dog Star".

Sirius can 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 2.6 pc or 8.57 light years (50.3 trillion miles), Sirius is also one of the nearest stars to Earth. The best time of year to view it is around January 1, when it reaches the meridian at midnight.

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 by the Latin name Canicula ("little dog") and as الشعرى aš-ši’rā in Arabic astronomy, from which the alternate name Aschere derives.

In Chinese culture, the star is known as 天狼星 (literially, heavenly wolf star).

Its closest large neighbour star except Sirius B is Procyon, 1.61 pc or 5.24 ly away.

In 1909, Ejnar Hertzsprung suggested that Sirius was part of the Ursa Major Moving Group; however, more recent research by Jeremy King et al. at Clemson University in 2003 questions whether that is true, since the two components of Sirius appear to be too young.

Binary system

In 1844 Friedrich Wilhelm Bessel deduced that Sirius was actually a binary star. In 1862 Alvan Graham Clark discovered the companion, which is called Sirius B, or affectionately "the Pup". 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 Wilson Observatory determined that Sirius B was a white dwarf, the first to be discovered.

Interestingly, this means that Sirius B must have originally been by far the more massive of the two, since it has already evolved off the main sequence. Robert Hanbury Brown measured the diameter of Sirius for the first time in 1956. In 2005, using the Hubble Space Telescope, astronomers determined Sirius B to be 12,000km (7,600 miles) in diameter, with a mass that is 98% of the Sun.

History

Historically, many cultures have attached special significance to Sirius. Sirius was worshipped as Sothis in the valley of the Nile long before Rome was founded, and many ancient Egyptian temples were oriented so that light from the star could penetrate to their inner altars. The Egyptians based their calendar on the heliacal rising of Sirius, which occurred just before the annual flooding of the Nile and the Summer solstice. In Greek mythology, Orion's dog became Sirius. The Greeks also associated Sirius with the heat of summer: they called it Σείριος Seirios, often translated "the scorcher." This also explains the phrase "dog days of summer".

Read more at Wikipedia.org


[List your site here Free!]

New listing
		New Wired Beats By Dr. Dre. Tour 2.0 In-Ear Earphones Headphones White FoldableNew listing New Wired Beats By Dr. Dre. Tour 2.0 In-Ear Earphones Headphones White Foldable New listing
		Koss Full-size Over-the-head Mossy Oak HeadphonesNew listing Koss Full-size Over-the-head Mossy Oak Headphones
New listing
		Safco Over-the-Door Double Hook with 2 HangersNew listing Safco Over-the-Door Double Hook with 2 Hangers New listing
		Apple iPod touch 5th Generation Black & Silver (16 Gb) (Model A1509) LatestestNew listing Apple iPod touch 5th Generation Black & Silver (16 Gb) (Model A1509) Latestest
New listing
		Guc* iHome-iP29-Portable Speaker Case Dock For Apple Ipod Iphone 4S Or BeforeNew listing Guc* iHome-iP29-Portable Speaker Case Dock For Apple Ipod Iphone 4S Or Before New listing
		OtterBox Defender Series Gray Case for iPod touch 4GNew listing OtterBox Defender Series Gray Case for iPod touch 4G
New listing
		iPod Mini iTop Mini Button Relocator NykoNew listing iPod Mini iTop Mini Button Relocator Nyko New listing
		Skullcandy Supreme Sound Chops 9mm Headphones Lime Green NewNew listing Skullcandy Supreme Sound Chops 9mm Headphones Lime Green New
New listing
		New Audio-Technica Premium Compact Earphone Silver F/S From JapanNew listing New Audio-Technica Premium Compact Earphone Silver F/S From Japan New listing
		Bose SoundLink Bluetooth Mini Speaker Soft Cover Gray 7.2 x 2.5 x 2 inchesNew listing Bose SoundLink Bluetooth Mini Speaker Soft Cover Gray 7.2 x 2.5 x 2 inches
New listing
		2Xblack Led Dancing Water Show Music Fountain Light Speakers for Computer LaptopNew listing 2Xblack Led Dancing Water Show Music Fountain Light Speakers for Computer Laptop New listing
		Ihome High Performance Noise-isolating Earphones With Microphone (red)New listing Ihome High Performance Noise-isolating Earphones With Microphone (red)
New listing
		Vizio Xvthb100 Bluetooth Stereo Headphones (Black)New listing Vizio Xvthb100 Bluetooth Stereo Headphones (Black) New listing
		New Beats By Dr. Dre urBeats White Earbud Headphones Genuine Sealed In-Ear BudsNew listing New Beats By Dr. Dre urBeats White Earbud Headphones Genuine Sealed In-Ear Buds
New listing
		New Audio-Technica Sonic Fuel Blue Earphone Ath-Ckx7iS Bl F/S From JapanNew listing New Audio-Technica Sonic Fuel Blue Earphone Ath-Ckx7iS Bl F/S From Japan New listing
		Fm Transmitter for ipod iphone 4 4S 3 3S Touch Nano withou remote controlNew listing Fm Transmitter for ipod iphone 4 4S 3 3S Touch Nano withou remote control
New listing
		Aux Input Adapter iPod iPhone Cd Player Radio Mp3 For Bmw E60 E63 E64 525i 530iNew listing Aux Input Adapter iPod iPhone Cd Player Radio Mp3 For Bmw E60 E63 E64 525i 530i New listing
		New Mp 3 playerNew listing New Mp 3 player
New listing
		Life and Soul bluetooth headphonesNew listing Life and Soul bluetooth headphones New listing
		OontZ Titanium Black Curve Super Portable Wireless Bluetooth SpeakerNew listing OontZ Titanium Black Curve Super Portable Wireless Bluetooth Speaker
New listing
		Etekcity RoverBeats T16 Ultra Portable Wireless Bluetooth Speaker BlueNew listing Etekcity RoverBeats T16 Ultra Portable Wireless Bluetooth Speaker Blue New listing
		Apple iPod nano 6th Generation 8Gb Graphite Great Condition 1,977 songs BundleNew listing Apple iPod nano 6th Generation 8Gb Graphite Great Condition 1,977 songs Bundle
New listing
		Apple iPod nano 6th Generation Blue 16 Gb Bundle With Original Apple Usb ChargerNew listing Apple iPod nano 6th Generation Blue 16 Gb Bundle With Original Apple Usb Charger New listing
		Ayl Portable Black Mini Speaker System with 3Yr GuaranteeNew listing Ayl Portable Black Mini Speaker System with 3Yr Guarantee
New listing
		New SanDisk Clip Sport 4Gb / 8Gb Mp3 Sdmx24 in 6 ColorsNew listing New SanDisk Clip Sport 4Gb / 8Gb Mp3 Sdmx24 in 6 Colors New listing
		Cord wrapper (for headphone wires) skull and crossbones designNew listing Cord wrapper (for headphone wires) skull and crossbones design
New listing
		Fm Transmitter+Car Charger for iPod Touch iPhone 3G 3Gs 4 4S NanoNew listing Fm Transmitter+Car Charger for iPod Touch iPhone 3G 3Gs 4 4S Nano New listing
		Sony Walkman Tps-L2New listing Sony Walkman Tps-L2
New listing
		iLive Wireless Bluetooth Speaker w Cd Player Digital Fm RadioNew listing iLive Wireless Bluetooth Speaker w Cd Player Digital Fm Radio New listing
		Ion Clipster Ultra-Portable Black Bluetooth Speaker with Built-In ClipNew listing Ion Clipster Ultra-Portable Black Bluetooth Speaker with Built-In Clip
New listing
		Sirius/xm Satellite Radio With Vehicle KitNew listing Sirius/xm Satellite Radio With Vehicle Kit New listing
		15Wx 2 Mini Hi-Fi Stereo Audio Speaker Bookshelf Stand Mount for Tablet Pc Mp3New listing 15Wx 2 Mini Hi-Fi Stereo Audio Speaker Bookshelf Stand Mount for Tablet Pc Mp3
New listing
		Symphonized Nrg Premium Genuine Headphones Wood In-ear Noise-isolating BiueNew listing Symphonized Nrg Premium Genuine Headphones Wood In-ear Noise-isolating Biue New listing
		Sms Sync by 50 over-ear Headband Wireless Headphones -whiteNew listing Sms Sync by 50 over-ear Headband Wireless Headphones -white
New listing
		Hercules Bluetooth 2.0 SpeakerNew listing Hercules Bluetooth 2.0 Speaker New listing
		Turcom Turcom 5 Watt Power Black Mini Portable Bluetooth 4.0 Wireless SpeakerNew listing Turcom Turcom 5 Watt Power Black Mini Portable Bluetooth 4.0 Wireless Speaker
New listing
		Lepow Modre Portable Wireless Bluetooth Speaker Green 2.2 x 2.2 x 5.5 inchesNew listing Lepow Modre Portable Wireless Bluetooth Speaker Green 2.2 x 2.2 x 5.5 inches
New listing
		Apple iPod Classic 7th Generation Black (160 Gb) (Latest Model)New listing Apple iPod Classic 7th Generation Black (160 Gb) (Latest Model) New listing
		Genuine Sirius Xm Onyx Xvant1 Magnetic Mount Antenna For Sirius Xm Onyx Xez1New listing Genuine Sirius Xm Onyx Xvant1 Magnetic Mount Antenna For Sirius Xm Onyx Xez1
New listing
		Go Stereo Istage Ipod Mp3 Blue Portable SpeakerNew listing Go Stereo Istage Ipod Mp3 Blue Portable Speaker New listing
		Apple iPod Nano® 4th Generation 8Gb - Green - Great Condition - Ships Same Day!New listing Apple iPod Nano® 4th Generation 8Gb - Green - Great Condition - Ships Same Day!
New listing
		Ion Clipster Ultra-Portable Purple Bluetooth Speaker with Built-In ClipNew listing Ion Clipster Ultra-Portable Purple Bluetooth Speaker with Built-In Clip New listing
		Pyle Active Sport Waterproof Bluetooth Headphones + Call Answering Pswbt7BkNew listing Pyle Active Sport Waterproof Bluetooth Headphones + Call Answering Pswbt7Bk
New listing
		Brand New Stax condenser-type ear speaker system Stax Srs-3170 from JapaNNew listing Brand New Stax condenser-type ear speaker system Stax Srs-3170 from JapaN New listing
		Etekcity RoverBeats T3 Ultra Portable Wireless 3.5mm Bluetooth Speaker WhiteNew listing Etekcity RoverBeats T3 Ultra Portable Wireless 3.5mm Bluetooth Speaker White
New listing
		Lepow Modre Portable Wireless 3.7v/500 mA Bluetooth Speaker BlueNew listing Lepow Modre Portable Wireless 3.7v/500 mA Bluetooth Speaker Blue
Click to see more Sirius items at ebay.com
Prices current as of last update, 02/26/15 4:35am.

See also...
Complete Systems, Sirius, Satellite Radio
Other Products & Kits, Sirius, Satellite Radio
Receivers Only, Sirius, Satellite Radio

Home Contact Resources Exchange Links ebay