HTV-4

 2013-040A

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\uni{ 宇宙ステーション補給機}{ }

Uchu suteshon hokyu-ki (HTV)

\uni{ 「こうのとり」4 号機}{ }

Kounotori 4-goki.

HTV-4 carries 2257 kg of pressurized cargo (54 kg accounted) and 887 kg of unpressurized cargo per NASA Jul 2013 ISS status. This HTV uses the old R-4D engines.

According to the press kit, it carries 3900 kg of PLC cargo including 8 HRR and 1500 kg of EP cargo. Mass at undocking is 13760 kg.

STP-H4 will be installed on ELC1 Site 3; MBSU will be installed on ELC2 Site 1; and UTA will go to ELC4 Site 4.

On Aug 3 Japan launched the fourth H-II Transfer Vehicle, Kounotori-4, to deliver cargo to the ISS. HTV carries pressurized cargo that will be transferred through the Harmony module hatch and an external pallet whose payloads will be installed using the robot arms. Mass of HTV-4 is very roughly 16000 kg.

The EP carries the Space Test Program H4 package to be installed on ELC1, a spare Main Bus Switching Unit for ELC2, and a spare SARJ Utility Transfer Assembly for ELC4. The MBSU is around 100 kg; I haven't been able to find masses for STP-H4 and UTA, but they are each probably around 300 to 400 kg (send me better data if you have it!)

The pressurized cargo is packaged in 8 HTV Resupply Racks and includes the FROST freezer, the Kirobo robot, NASA's RRM Task Board 3 robotics experiment, and two J-SSOD cubesat launchers. The J-SSODs will be taken outside via the Kibo science airlock and will eject their passengers. One J-SSOD carries three 1U cubesats: Vietnam's PicoDragon, and the US company NanoSatisifi's Arudsat-X and Ardusat-1, which use Arduino open-source processors to run experiments. The other J-SSOD carries TechEdSat-3p, a 3U cubesat from NASA-Ames and San Jose State University, which will deploy an 0.6m `Exobrake' sail to test a way to increase the cubesat's drag and make it reenter quickly.

The 319 kg STP-H3 payload will be placed in HTV-4 for disposal.

This is the first H2B launch carried out by MHI rather than JAXA

HTV4
Date	Time	Event	Orbit
2013 Aug 3	1948:46	Launch by H2B	TNSC
		T+1:54 SRB burnout
	1950:53	T+2:04 SRB 1-2 sep
	1950:56	T+2:07 SRB 3-4 sep at 63 km
	1952:26	T+3:40 Fairing sep at 120 km
	1954:32	T+5:47 MECO
	1954:40	T+5:54 St 1 sep
	1954:51	T+6:01 SEIG
	2003:01	T+14:20 SECO	89.40 186 x 304 x 51.7
	2003:35	T+15:11 St 2 sep
	2128?	T+1:39? SEIG-2 at end of orbit 1 over Japan
	2128?	T+1:39? SECO-2
	2158?	St 2 entry over S Pacific
2013 Aug 4	0423	PCM1
2013 Aug 4			90.36 281 x 302 x 51.6
	0451s	TCM2
2013 Aug 7	0935	90.36 282 x 301 x 51.6
2013 Aug 7	1713	HAM1 burn
2013 Aug 8			92.30 372 x 402 x 51.7
2013 Aug 9	0139	HAM0 burn
	0444	HAM2 burn
2013 Aug 9		Rendezvous with ISS
	0531	AI Approach Init point, 5 km, stop
	0809	AI departure
	0848	RI burn
	0908	R-bar approach begins
	0911	Range 500m
	0929	At 250m hold
	1006	Depart 250m hold
	1030	Inside capture envelope,
	1034	30m hold
	1052	Depart 30m hold
	1108	At 10 m capture point
	1122	Grappled with SSRMS
	1420	Aligning for install
	1520	Ready to latch, contact with Harmony Node 2
	1528	1st stage capture
	1538	2nd stage capture
2013 Aug 10	1111	HO to PLC
2013 Aug 11	2107	EP removed from ULC by SSRMS
		JRMS grapple EP
		SSRMS ungrapple EP
2013 Aug 12	0359	EP installed on EF by JRMS
2013 Aug 24		SPDM unberth UTA and MBSU
2013 Aug 27
		MT move from WS2 to WS7
		SPDM pick up STP-H4 from EP
		SPDM put STPH4 on ELC1 FRAM 3
2013 Aug 28
		SPDM pick up STP-H3 from ELC3.5
		SPDM put STP-H3 on EP
2013 Aug 29		SPDM stow
		MT move from WS7 to WS4
		SSRMS base from PDGF3 to N2
2013 Aug 30
		JRMS pick up EP
		JRMS hand EP to SSRMS
	1400?	SSRMS begin stow EP in HTV
	1435	EP stowed in HTV
		SSRMS grapple HTV
2013 Sep 4
	0235	HC to HTV
	1207	HTV4 unberth
	1620	HTV4 release by SSRMS
	1623	Range 9 m
	1627	IDM-1 Sep-1 burn
	1631	30m range
	1636	IDM-2 Sep-2 burn
	1643?	DSM-1 Descending Sep-3 burn	92.76 408 x 411 x 51.6
		DSM-2 burn
2013 Sep 5			90.58 187 x 408 x 51.6
2013 Sep 7			90.48 188 x 407 x 51.6
	0007	Deorbit burn 1
	0137	Deorbit burn 2	90.12 151 x 408 x 51.6
	0611	Deorbit burn 3 over 128E 35N, 55m/s?
	0637	Entry over Pacific 120 km