Solar-B Launch Operations Scenarios

ISAS/JAXA Solar-B projectPrepared by T. Shimizu

For Wallops face-to-face meeting

Launch operation

Table 4. Orbit element (at launch) TOD

Item Unit Nominal value Variation

Epoch UTC 309s after launch ― ― ― ―

hp km 250 +8/-25

ha km 600 ± 120

i deg 97.79 ± 0.6

Ω deg 308.75 ± 0.35

ω deg 150.91 ― ― ― ―

M deg 4.96 ― ― ― ―

longitude of ascending (north-bound) node, which defines at what longitude Solar-B crosses the earth equator

Solar-B will be launched from USC (Kagoshima Uchinoura Space Center, Japan).

Launch window: 21:32:46-21:41:04 UT in 23 August 2006 to 26 September 2006.

The initial orbit to be installed by a M-V rocket is as follows:

ブラジル

フランス領ギアナ

スリナム

ガイアナベネズエラ

コロンビア

エクアドル

ペルー

ボリビア

パラグアイ

アルゼンチンウルグアイ

チリ

太陽

equator

３段ロケット燃焼終了

AGO局

図.2.3-4 打ち上げからパドル展開までの姿勢変更を示す図

衛星分離Time X+510 sec

ﾚｰﾄﾀ ﾝ゙ﾌ 、゚太陽ｻ ｰﾁ開始

太陽捕捉完了

Time X+660 sec

Time X+1980 sec

SAP展開開始Time X+1982sec

SAP展開完了Time X+2162 sec

ＳＡｐ展開開始

ＳＡＰ展開完了

打ち上げ

３段ロケット燃焼完了

309sec 201sec

衛星分離

レートダンプ

150sec

太陽捕捉完了

太陽サーチ開始

1320sec 180sec

Sun

3-stage engine burn out

Satellite separation

Start rate dumping and search sun

Complete sun acquisition by

Start SAP deploymentComplete SAP deployment

JAXA USC

JAXA PER

JAXA AGO

NASA WPS

JAXA AGO

StationX=21:32:46 Lift off

21:49-21:56

Visible window

22:18-22:27

22:37-22:46

23:50-23:59

~21:40

S/C EventsActions at station

21:41:16 Satellite separation21:44:01 Start attitude RSA control mode (rate dumping and search the sun)

22:06:01 Start deployment of solar array paddle (SAP)22:09:23 Resume attitude RSA control mode22:12 Complete sun acquisition (Attitude directed to sun)

23:47:46 Fine sun sensors (UFSS) & Star tracker (STT) ON23:47:49 Enable telescopes’ survival heaters

Times given here are not finalLaunch case: 23 Aug 2006

Complete sun acquisition (Attitude directed to sun)

Confirm SAP deployment, sun acquisition, power supply SHNT mode

Confirm sun acquisition mode, power supply SHNT mode

Confirm UFSS/STT ON, telescopes’ survival heaters

If off-nominal cases, may perform a recovery/trouble-shooting procedure

If off-nominal cases, may perform a recovery/trouble-shooting procedure

If off-nominal cases, may perform a recovery/trouble-shooting procedure

Note: AGO (U.Chili) measures El/Az

(UT)

(RSA= RCS sun acquisition mode)

Check orbit and status

Backup for AGO Rev.0

Solar-B Battery In case that the solar array paddle is not deployed, the battery can supply the power for 160 min.

Orbit maneuvers for sun-sync. polar orbit

Table 5. Orbit element (at observation phase)

item unit Value

Hight km 630km

i deg 97.9

(Near Sun Sync. orbit)

Solar-B will be finally installed to the sun-synchronous polar orbit with maneuver operation in the next page.

Y+3 Y+6

TEST Maneuver ⊿a #0

⊿a #1

⊿a #2

⊿a #3

⊿i ⊿final

RSA MSA

GAS STT

Y+11 Y+14 Y+17 Y+20

Attitude Mode

A.D. Sensor

（around Z axis）

Complete of orbit control

Launch

Final Adjustment of inclination

⊿hp≒ 10km

⊿hp≒ 188km

⊿hp≒ 188km

⊿ha≒ 40km

Y+days