N-STAR b

N-STAR b, was a geostationary communications satellite originally ordered by a consortium including NTT DoCoMo and JSAT Corporation, and later fully acquired by JSAT, which was merged into SKY Perfect JSAT Group. It was designed and manufactured by Space Systems/Loral on the SSL 1300 platform.[2] It had a launch weight of approximately 3,400 kg (7,500 lb), and a 10-year design life.[2] Its payload is composed of 6 C band, 11 Ka band, 8 Ku band and 1 S band transponders.

N-STAR b
Mission typeCommunication
OperatorSKY Perfect JSAT Group
COSPAR ID1996-007A[1]
SATCAT no.23781
Spacecraft properties
SpacecraftN-STAR b
BusSSL 1300
ManufacturerSpace Systems/Loral
Launch mass3,400 kg (7,500 lb)[2]
BOL mass2,050 kg (4,520 lb)
Dry mass1,617 kg (3,565 lb)
Start of mission
Launch date07:19:38, February 5, 1996 (UTC) (1996-02-05T07:19:38Z)[3]
RocketAriane 44P
Launch siteKourou ELA-2
ContractorArianespace
Orbital parameters
Reference systemGeocentric
RegimeInclined geosynchronous
Semi-major axis42,451 km
Perigee altitude36,037.74 km
Apogee altitude36,123.3 km
Inclination7.9°
Period1,450.8 minutes
Epoch2016-08-21 00:00:00 UTC[4]
Transponders
BandC band: 6
Ka band: 11
Ku band: 8
S band: 1[5]
 

History

N-Star was created as a joint venture between JSAT, NTT, NTT Communications and NTT DoCoMo for the supply of these latter two WIDESTAR satellite telephone and data packet service.[6] JSAT would handle the satellite side of business and NTT DoCoMo would operate the payload.[7][8]

Two identical satellites were ordered on 1992 from Space Systems Loral, N-STAR a and N-STAR b, for 1995 and 1996 on orbit delivery.[9][10] They would be "switchboards in the sky" having S band, C band, Ka band and Ku band payload.[11]

N-STAR a was successfully launched aboard an Ariane 44P on August 29, 1995. Its twin, N-STAR b, launched on February 5, 1996, also aboard an Ariane 44P.[2][11] The satellite telephone service was operational in March 1996. On March 2000, the packet communications service was introduced.[12] On March 2000, JSAT received the NTT Communications interest in the N-STAR a and N-STAR b.[13][14]

On August 2003 the JSAT acquired the NTT DoCoMo interest on N-STAR a and N-STAR b, whom then leased them back.[15][16]

gollark: 3.
gollark: My theory of what's up, copied from the forum thread:If many new eggs are being introduced to the system, then that will most affect the stuff which is rarest, by making it rarer by comparison, but commons will stay the same. As for why it happened now? Weekly updates, possibly.Example:Imagine there are 200 dragons, 5 of which are golds.The ratio of golds to total dragons is now 5:200 = 1:40. If the target ratio is 1:50 then prices will be higher to compensate.Now imagine there are an extra 200 dragons added, none of which are golds.The ratio would then be 5:400 = 1:80. Then, assuming the same target, prices will drop.This is of course simplified, and the ratios may not work like this, but this matches observed behavior pretty well.
gollark: That why was rhetorical.
gollark: As I said on the forums:```That makes sense. If many new eggs are being introduced to the system, then that will most affect the stuff which is rarest, by making it rarer by comparison, but commons will stay the same. As for why it happened now? Weekly updates, possibly.```
gollark: Why?

See also
  • JCSAT-5A – Also known as N-STAR d, was the follow on satellite.

References
  1. "N-STAR-B". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-19.
  2. Krebs, Gunter Dirk (2016-08-19). "N-Star a, b". Gunter's Space Page. Retrieved 20 July 2016.
  3. "N-STAR-B". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-19.
  4. "NSTAR B". n2yo.com. Retrieved 2016-08-21.
  5. "Communications in Japan 1999" (PDF). General Planning and Policy Division, Minister’s Secretariat (Whitepaper). Communications in Japan (1999 ed.). Ministry of Posts and Telecommunications of Japan. 1999: 132. Retrieved 2016-08-20. Cite journal requires |journal= (help)
  6. "FORM 20-F/A AMENDMENT NO.1 TO FORM 20-F" (PDF). NTT DoCoMo. February 8, 2002. Retrieved 2016-08-02.
  7. "FORM 20-F/A AMENDMENT NO.1 TO FORM 20-F" (PDF). NTT DoCoMo. July 10, 2002. Retrieved 2016-08-02.
  8. "FORM 20-F/A AMENDMENT NO.1 TO FORM 20-F" (PDF). NTT DoCoMo. July 3, 2003. Retrieved 2016-08-02.
  9. "N-Star". Global Security. Retrieved 2016-08-02.
  10. "Awards & Launch History - 1300 Bus Satellites". SSL. Archived from the original on 2015-08-12. Retrieved 2016-08-20.
  11. "N-Star a and b". SSL. Retrieved 2016-08-18.
  12. Yamamoto, Kazuichi; Furukawa, Makoto; Satoh, Hijin; Nishi, Yasuki; Kouji, Horikawa (September 2010). "Overview of WIDESTAR II Mobile Satellite Communications System and Service" (PDF). NTT DoCoMo Technical Journal. NTT DoCoMo. 12 (2): 37–42. Retrieved 2 August 2016.
  13. "Who we are" (PDF). SKY Perfect JSAT Group. 2012-08-03. Retrieved 2016-08-02.
  14. "History". SKY Perfect JSAT Holdings Inc. Retrieved 2016-07-28.
  15. "NTT DoCoMo to Transfer Satellite Assets to JSAT and Acquire JSAT Common Stock". NTT DoCoMo. July 31, 2003. Retrieved 2016-08-02.
  16. "FORM 20-F/A AMENDMENT NO.1 TO FORM 20-F" (PDF). NTT DoCoMo. June 28, 2004. Retrieved 2016-08-02.
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