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Hodoyoshi 4

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Japanese micro-satellite launched in 2014

Hodoyoshi-4
Spacecraft properties

Mission type	Earth observation
Operator	NESTRA
COSPAR ID	2014-033B
SATCAT no.	40011
Mission duration	11 years, 7 months, 29 days (ongoing)


Manufacturer	University of Tokyo
Launch mass	66 kg (146 lb)


Start of mission
Launch date	19:11, June 19, 2014 (UTC) (2014-06-19T19:11:00Z)
Rocket	Dnepr
Launch site	Dombarovsky
Contractor	ISC Kosmotras


Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Eccentricity	0
Perigee altitude	620 km (390 mi)
Apogee altitude	620 km (390 mi)
Inclination	97.9°

Hodoyoshi-4 is a Japanese micro-satellite launched in 2014. The satellite is built in 0.5x0.6x0.7m box-shape bus, optimized for piggy-back launch.All instruments are powered by solar cells mounted on the spacecraft body and two stub wings, with estimated electrical power of 50W.^[1] For orbit-keeping, a "miniature" (5 kg dry weight)ion thruster withspecific impulse of 1100 s and operating power of 20 W is integrated into the body.^[2] The satellite was developed under the Funding Program for World-Leading Innovation R&D on Science and Technology.^[3]

Launch

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Hodoyoshi-4 was launched fromDombarovsky air base site 13, Russia, on 19 June 2014 by aDnepr rocket. Two-side communication with Earth was successfully achieved at 2nd pass over ground station.

Mission

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The satellite is intended primarily for technology verification in space, main test piece being Earth observation telescope with nominal 6.7mground sample distance GSD at 650 km altitude.

Hiroshima, Japan, taken by Hodoyoshi-4 satellite

Albert, France taken by Hodoyoshi-4 satellite

Space Message Display System: Electronic Message Display & Observation Window

Hosted Payload Box installed on Hodoyoshi-3 & Hodooyshi-4 satellites

^[4]

Specification of Hodooyshi-4 Earth observation telescope
Item	Value
GSD	5-7m @ 600-650 km
Type	Pushbroom scan
Diameter	150 mm
Focal Length	1,000 mm
Swath	24 km
Format	Raw, 12bit
Band	Blue: 0.45-0.52 μm, Green: 0.52-0.60 μm, Red: 0.63-0.69 μm,NIR: 0.73-0.90 μm

Secondary mission is measurements of water level in rivers to monitor floods by using Store&Forward System.^[5] Third mission is Hosted Payload. Hosted Payload mission consisted of 10 cm-cubic boxes on which users could install their own apparatuses for their own applications. Project members asked users in private partnership in order to explore new market of satellite utilization. One of the apparatuses was space message display system. Electronic message display was installed which operators could change characters on the display by sending commands from the ground station. Users can take photos of their messages with the view of the earth from the window.

References

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^Shinichi, Nakasuka."Opening Remarks at the 4th Nano-satellite Symposium"(PDF). Archived fromthe original(PDF) on 2016-10-11. Retrieved2014-06-24.
^Koizumi, Hiroyuki; Komurasaki, Kimya; Arakawa, Yoshihiro (2012). "Development of the Miniature Ion Propulsion System for 50 kg Small Spacecraft".48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit.doi:10.2514/6.2012-3949.ISBN 978-1-60086-935-8.
^"Funding Program for World-Leading Innovative R&D on Science and Technology(FIRST Program) | Japan Society for the Promotion of Science". Archived fromthe original on 2016-03-04. Retrieved2014-11-25.
^"Hodoyoshi 4".
^"Satellites to track Fukushima, Chernobyl effects".Business Standard India. 2014-06-19.

External links

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Hodoyoshi 4 onFacebook
Nano-Satellite Center, University of Tokyo
Hodoyoshi and UNIFORM satellites tracking

Japanese space program

Italics indicates projects in development.
Symbol^† indicates failed projects.
~~Strikethrough lines~~ indicate cancelled projects.

Space agencies

National space agencies	JAXA formerISAS NAL NASDA NICT JSS
Joint development partners	United StatesNASA¹ ESA² ItalyASI³ CanadaCSA⁴ RussiaRoscosmos⁵ BrazilAEB⁶ INPE⁷ IndiaISRO⁸

Astronomical observation

Past	Akari ASCA ASTRO-E^† ~~Astro-G~~ CORSA^† Ginga Hakucho HALCA Hinotori Hisaki Hitomi^† ~~SPICA~~ Suzaku Tenma Yohkoh
Active	Hinode XRISM¹
Future	ATHENA² Solar-C¹ GREX-PLUS [ja] HiZ-GUNDAM [ja] LAPYUTA LiteBIRD Nancy Grace Roman Space Telescope¹ JASMINE

Communications satellites,broadcasting satellites andsatellite navigation systems

Past	BS 2X 3H 3N Kakehashi Kirari Kizuna Kodama MBSat N-STAR a b Sakura (1 2a 2b 3a 3b) Yuri 1 2a 2b 3a 3b
Active	Kirameki 1 2 3 Michibiki 1 2 3 4 6 1R MTSAT N-STAR c d JDRS
Future	QZS 5 7

Earth observation

Past	Akebono Daichi 1 3^† Denpa Fuyo-1 Jikiken Kyokko Midori I II Momo 1 1b Ohozora Taiyo TRMM¹ Ume 1 b Geotail¹
Active	Aqua^1,7 Arase ASNARO 1 2 Daichi 2 4 EarthCARE² GPM¹ Himawari Ibuki original 2 Shikisai Shizuku GOSAT-GW
Future	PMM

Engineering tests

Past	Ayame 1 2 DASH EXPRESS IKAROS Jindai Kiku 1 2 3 4 5 6 7 8 LDREX 1 2 LRE Micro LabSat-1 Myojo Ohsumi Orizuru RAISE 2 3^† ~~PETSAT~~ RAPIS-1 Ryusei SERVIS-1 SERVIS-2 SDS-1 SDS-4 SFU Shinsei ~~SmartSat-1~~ Tansei 1 2 3 4 Tasuki Tsubame Tsubasa USERS
Active	Ajisai Reimei
Future	BEAK ETS-IX G-SATELLITE SERVIS-3

Human spaceflight

Past	~~Fuji crewed spacecraft~~ ~~HOPE-X~~ H-II Transfer Vehicle
Active	International Space Station (ISS) &Japanese Experiment Module (Kibō)^1,2,3,4,5,6 HTV-X
Future	Japanese Space Station Module (Mitsui) Lunar Gateway^1,2,4

Space probes

The Moon

Past	Hakuto-R Mission 1^† Hiten ~~Lunar-A~~ Kaguya (SELENE) OMOTENASHI^† ~~SELENE-2~~ Smart Lander for Investigating Moon (SLIM) Hakuto-R Mission 2^† EQUULEUS Yaoki
Future	~~HERACLES~~^2,4 Lunar Cruiser Lunar Polar Exploration Mission⁸ (LUPEX)

Others

Past	Akatsuki Hayabusa ~~Hayabusa Mk2~~ Nozomi^† PROCYON^† Sakigake Shin'en^† Suisei
Active	BepiColombo (MMO/Mio)² Hayabusa2 Jupiter Icy Moons Explorer² Hera²
Future	Comet Interceptor² DESTINY+ Dragonfly¹ MELOS Martian Moons eXploration Next Generation Small-Body Sample Return TEREX

Reconnaissance satellites

Past	IGS-Optical 1 2 Experimentally 3 IGS-Radar 1 2
Active	IGS-Optical 3 4 5 6 Experimentally 5 IGS-Radar 3 4 Spare 5 6
Future	IGS-Optical 7 8 IGS-Radar 7 8

Privatesmall satellites

Past	CosMoz CUTE 1.7+APD Fuji 1 2 Hayato HIBARI HIT-SAT Kagayaki Kanta-kun (WEOS) Kūkai Maido-1 Negai☆″ Niwaka RAIKO Waseda-SAT2 WE WISH
Active	CUTE 1 1.7+APDII Fuji-3 Hitomi Hodoyoshi 1 2 3 4 Horyu 2 Kiseki PROITERES Raijin Raijin-2 SEEDS SOCRATES XI IV V
Future	DRUMS KITSUNE OPUSAT-II QSAT-EOS RSP-01 SOMESAT SpaceTuna1 SPROUT TSUBAME WNI satellite

v t e ← 2013 Orbital launches in2014 2015 →
January	GSAT-14 Thaicom 6 CRS Orb-1 (Flock-1 × 28,ArduSat-2,Lituanica SAT-1,LitSat-1,SkyCube,UAPSat-1) TDRS-L
February	Progress M-22M ABS-2,Athena-Fidus Türksat 4A USA-248 GPM Core,Ginrei,KSAT-2,INVADER,OPUSAT,STARS-II,TeikyoSat-3,ITF-1
March	Ekspress AT1,Ekspress AT2 Astra 5B,Amazonas 4A Kosmos 2494 Soyuz TMA-12M Shijian XI-06
April	USA-249 /DMSP-5D3 F19 Sentinel-1A IRNSS-1B Progress M-23M Ofek-10 USA-250 EgyptSat 2 SpaceX CRS-3 (KickSat) Luch 5V,KazSat-3
May	Kosmos 2495 Ekspress AM4R USA-251 USA-252 Kosmos 2496,Kosmos 2497,Kosmos 2498,Kosmos 2499 ALOS-2,Raijin-2,UNIFORM-1,SOCRATES,SPROUT Eutelsat 3B Soyuz TMA-13M
June	Kosmos 2500 /GLONASS-M 755 AprizeSat 9,AprizeSat 10,BRITE-Montreal,BRITE-Toronto,BugSat 1,Deimos-2,Hodoyoshi 3,Hodoyoshi 4,KazEOSat 2,Perseus-M1,Perseus-M2,SaudiSat-4,TabletSat-Aurora,UniSat-6 (Lemur-1,Tigrisat),Flock-1c × 11 SPOT 7,CanX-4,CanX-5
July	OCO-2 Gonets-M × 3 Meteor-M No.2 O3b × 4 CRS Orb-2 (Flock-1b × 28,TechEdSat-4) Orbcomm-OG2 × 6 Foton-M No.4 Progress M-24M USA-253 /GSSAP 1,USA-254 /GSSAP 2,USA-255 / ANGELS Georges Lemaître ATV
August	USA-256 AsiaSat 8 Yaogan 20 A, B, C WorldView-3 Gaofen 2,Heweliusz Galileo FOC-1,Galileo FOC-2
September	Chuangxin 1-04,Lingqiao AsiaSat 6 Yaogan 21,Tiantuo 2 MEASAT 3b,Optus 10 USA-257 SpaceX CRS-4 Soyuz TMA-14M Olimp-K Shijian XI-07
October	Himawari 8 IRNSS-1C ARSAT-1,Intelsat 30 Yaogan 22 Ekspress AM6 Chang'e 5-T1,4M Shijian 11-08 Cygnus CRS Orb-3† (Arkyd-3†,Flock-1d × 26†) Progress M-25M USA-258 /GPS IIF 8 Meridian 7
November	Sasuke,Hodoyoshi 1,Kinshachi 1,Tsukushi,TSUBAME Yaogan 23 Yaogan 24 Kuaizhou 2 Soyuz TMA-15M Kosmos 2501
December	Hayabusa2,PROCYON,Shinen 2,DESPATCH Orion EFT-1 DirecTV-14,GSAT-16 CBERS-4 Yaogan 25 A, B, C USA-259 Yamal-401 O3b × 4 (FM9 to FM12) Kondor-E No.2 IPM Kosmos 2502 Resurs-P No.2 Yaogan 26 Astra 2G Fengyun 2-08
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).