Author Topic: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012  (Read 39929 times)

Offline input~2

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Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
« Reply #60 on: 05/10/2012 05:06 AM »
The perigees of new Objects A and B have been raised:

Object A:
May [email protected]: 21460 x 21594 km x 55.16°

Object B:
May [email protected]: 21456 x 21601 km x 55.11°

with the following Object reshuffling:
old Object A becomes new Object C
old Object B becomes new Object D
old Object C becomes new Object A
old Object D becomes new Object B
« Last Edit: 05/12/2012 07:14 AM by input~2 »

Offline LaurelCat

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Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
« Reply #61 on: 05/10/2012 10:08 PM »
AFAIU, CALT calls the SPELDA-like adaptor "dual satellite connecting external support structure" (双星串联外支撑结构) could be abbreviated as "DSCESS"
(source)

I'm not sure about the translation of 串联 (chuanlian) - possibly "serial" as opposed to "parallel" ?

I get   'shuanxing chuanlian wai zhicheng jiegou'  (SCWZJ) if you want to play that game (or if we are going to copy SPELDA, perhaps we should use French..)

串联 (chuanlian) = in tandem configuration

Offline input~2

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Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
« Reply #62 on: 05/11/2012 10:17 AM »
According to a report published on Beidou website, after 3 orbit changes on May 5 and 6 MEO3 and MEO4 entered their preset orbits and are working nominally.
(source)

Offline input~2

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Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
« Reply #63 on: 05/11/2012 06:15 PM »
USSTRATCOM has now identified the 4 objects as:
  • 38250/2012-018A BEIDOU M3
  • 38251/2012-018B BEIDOU M4
    38252/2012-018C CZ-3B R/B (ie 3rd stage)
  • 38253/2012-018D CZ-3B DEB (ie adaptor)

    The 3rd stage's radar cross section is said to be 3.415mē  much less than that of  the adaptor at 7.7509mē ; this is surprising when looking at the respective size of the 2 objects ???
  • « Last Edit: 05/12/2012 03:46 PM by input~2 »

    Offline input~2

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #64 on: 05/12/2012 03:57 PM »

    Offline input~2

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #65 on: 05/21/2012 07:39 PM »
    USSTRATCOM has now identified the 4 objects as:
  • 38250/2012-018A BEIDOU M3
  • 38251/2012-018B BEIDOU M4
    38252/2012-018C CZ-3B R/B (ie 3rd stage)
  • 38253/2012-018D CZ-3B DEB (ie adaptor)

    The 3rd stage's radar cross section is said to be 3.415mē  much less than that of  the adaptor at 7.7509mē ; this is surprising when looking at the respective size of the 2 objects ???

  • USSTRATCOM has now switched Objects C and D, but the RCS order remains the same (35.3mē for the adaptor, 2.5mē for the 3rd stage) ???

    Offline input~2

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #66 on: 07/01/2012 07:52 AM »
    Status of the constellation presented in June 2012

    Offline Phillip Clark

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #67 on: 07/01/2012 08:52 AM »
    Status of the constellation presented in June 2012

    This illustration uses the strange definition of "de-orbit" which leaves the satellite still in orbit.   "De-orbit" has always meant to bring out of orbit into the atmosphere, but this does not seem to apply to de-orbited GEO satellites.   Maybe I am too old-fashioned and pedantic.
    I've always been crazy but it's kept me from going insane - WJ.

    Offline input~2

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #68 on: 07/01/2012 10:17 AM »
    Status of the constellation presented in June 2012
    Since early June, Beidou-1C (#3) has been drifting in a 35850 x 35865km orbit
    « Last Edit: 07/01/2012 10:17 AM by input~2 »

    Offline input~2

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    Re: Beidou-2, "Compass-M3&M4", CZ-3B, Xichang, April 29 2012
    « Reply #69 on: 09/19/2012 11:23 AM »
    USSTRATCOM has now identified the 4 objects as:
  • 38250/2012-018A BEIDOU M3
  • 38251/2012-018B BEIDOU M4
    38252/2012-018C CZ-3B R/B (ie 3rd stage)
  • 38253/2012-018D CZ-3B DEB (ie adaptor)

    The 3rd stage's radar cross section is said to be 3.415mē  much less than that of  the adaptor at 7.7509mē ; this is surprising when looking at the respective size of the 2 objects ???

  • USSTRATCOM has now switched Objects C and D, but the RCS order remains the same (35.3mē for the adaptor, 2.5mē for the 3rd stage) ???
    As of September 19, 2012, the adaptor with a perigee of 222km has an RCS of 15.3mē while the 3rd stage with a perigee of 162km has an RCS of 24.4mē

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