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Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
Sirius 3 was stationed at 51.2° East at the end if its lifetime in an inclined orbit Sirius 3 was leased to SES immediately after its launch on 5 October 1998 for a period of 12 months (after which it was moved to its original destination of 5.0° East) to provide capacity at 28.2° East and to back up Astra 2A , pending the launch of Astra 2B ...
The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it. A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
As of May 2022, there are six functional satellites in orbit: two XM, two Sirius, and two supporting both systems (one being a spare). [120] [121] XM-3 and XM-4 are the active satellites for the XM service and replaced the original XM-1 and XM-2 satellites (which were placed into disposal orbits). Sirius FM-5 and FM-6 function as the primaries ...
Its name comes from the Greek word for "scorching" or "searing". Sirius is also a binary star; its companion Sirius B is a white dwarf with a magnitude of 8.4–10,000 times fainter than Sirius A to observers on Earth. [32] The two orbit each other every 50 years. Their closest approach last occurred in 1993 and they will be at their greatest ...
On February 19, 2007, Sirius announced a merger deal with competitor XM Satellite Radio. [27] If the pending merger received government approval, which was required because of antitrust considerations, it would combine the two services into a single satellite radio network in the United States and would be named Sirius/XM Radio.
Astra 4A (originally Sirius 4) is one of the Astra communications satellites owned and operated by SES at the Astra 5°E orbital slot providing digital television and radio broadcasts, data, and interactive services to Nordic countries, eastern Europe and sub-Saharan Africa in the 11.70 GHz-12.75 GHz range of the K u band and 18.8 GHz-21.75 GHz range of the K a band.
Astra 5A was one of the Astra communications satellites owned and operated by SES at the Astra 31.5°E.Launched in 1997 to the 5° East position by NSAB (Nordiska Satelit AB) (later SES Sirius, and now a non-autonomous part of SES) as Sirius 2, operation of the satellite was transferred to SES in April 2008 and the craft renamed and moved to 31.5° East to open up a new orbital position for ...