Hodoyoshi 4

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	9 years, 10 months, 8 days (ongoing)


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


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


Orbital parameters
Reference system	Geocentric
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 with specific impulse 1100s and operating power 20W 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

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

Mission

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

^[4]

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

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

^ "Archived copy" (PDF). Archived from the original (PDF) on 2016-10-11. Retrieved 2014-06-24.{{cite web}}: CS1 maint: archived copy as title (link)
^ 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 from the original on 2016-03-04. Retrieved 2014-11-25.
^ "Hodoyoshi 4".
^ "Satellites to track Fukushima, Chernobyl effects". Business Standard India. 2014-06-19.

External links

Hodoyoshi 4 on Facebook
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 former ISAS NAL NASDA NICT JSS
Joint development partners	NASA¹ ESA² ASI³ CSA⁴ Roscosmos⁵ AEB⁶ INPE⁷ ISRO⁸

Astronomical observation

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

Communications satellites, broadcasting satellites and satellite 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 Michibiki 1 2 3 4 1R MTSAT N-STAR c d JDRS
Future	DSN 3 QZS 5 6 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 GPM¹ Himawari Ibuki original 2 Shikisai Shizuku
Future	ALOS-4 EarthCARE² GOSAT-GW 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 SFU Shinsei ~~SmartSat-1~~ Tansei 1 2 3 4 Tasuki Tsubame Tsubasa USERS
Active	Ajisai Reimei SDS-4
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
Future	HTV-X 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~~
Active	EQUULEUS Smart Lander for Investigating Moon (SLIM)
Future	Hakuto-R Mission 2 HERACLES^2,4 Lunar Cruiser Lunar Polar Exploration Mission⁸ (LUPEX) Yaoki

Others

Past	Hayabusa ~~Hayabusa Mk2~~ Nozomi^† PROCYON^† Sakigake Shin'en^† Suisei
Active	Akatsuki BepiColombo (MMO/Mio)² Hayabusa2 Jupiter Icy Moons Explorer²
Future	Comet Interceptor² DESTINY+ Dragonfly¹ Hera² 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

Private small 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 in 2014 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 ( / ). CubeSats are smaller. Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).