2007-003A
This payload remained in transfer orbit for several months with solar panel problems, but was eventually recovered. The satellite was an in-orbit reserve vehicle for Beidou 1.
One Chinese source refers to the satellite as "the fourth Big Dipper (Beidou) navigation experiment satellite"; di si ke beidou daohang shiyan weixing.
Bei is 'north' and Dou is 'cup', the "North Cup" is the Big Dipper asterism in Ursa Major (Ursa Major itself is daxiong zuo, great-bear constellation).
| Beidou 4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 2007 Feb 2 | 1628 | Launch by CZ-3A | XSC |
| T+2:25? Stage 1 MECO | |||
| T+2:27? Stage 2 MES, Stage 1 sep | |||
| T+3:52? Fairing sep | |||
| T+4:15? St 2 MECO | |||
| T+4:20? St 2 VECO | |||
| 1632? | T+4:21? St 2 sep, St 3 MES-1 | ||
| 1638? | MECO-1 | ||
| 1644? | MES-2? | ||
| 1646? | MECO-2 | ||
| 1650 | Perigee | ||
| 1652 | T+0:24 Stage 3 sep | ||
| 2300? | Debris event detected | ||
| 2007 Feb 4 | 194 x 41769 x 25.0 | ||
| 2007 Mar 8 | 181 x 41591 x 25.0 | ||
| 2007 Apr 4? | Solar panels deployed | ||
| 2007 Apr? | GEO insertion burn | ||
| 2007 Apr 13 | 1436.17 35333 x 36242 x 6.4 | ||
| 2007 May 3 | 1436.11 35332 x 36241 x 142.8E | ||
| 2009 Feb 16 | 1436.10 35269 x 36303 x 4.7 GEO 144.4E | ||
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