Advanced Satellite for Cosmology and Astrophysics

Names| ASTRO-D, Asuka
Mission type| X-ray observatory
Operator| ISAS / NASA
COSPAR ID| 1993-011A
SATCAT no.| 22521
Website| http://heasarc.gsfc.nasa.gov/docs/asca/
Mission duration| Final: 8 years, 10 days
Spacecraft properties
Manufacturer| NEC
Launch mass| 420 kg (930 lb)
Dimensions| 4.7 m (15 ft) long
Start of mission
Launch date| 20 February 1993, 02:20 (1993-02-20UTC02:20) UTC
Rocket| Mu-3SII, mission M-3SII-7
Launch site| Kagoshima Space Center, Japan
Contractor| ISAS
End of mission
Disposal| deorbited
Decay date| 2 March 2001, 14:20 (2001-03-02UTC14:21) UTC
Orbital parameters
Reference system| Geocentric
Regime| Low Earth
Eccentricity| 0.01
Perigee altitude| 523.6 km (325.3 mi)
Apogee altitude| 615.3 km (382.3 mi)
Inclination| 31.1°
Period| 96.09 minutes
Epoch| 20 February 1993
Main telescope
Type| Wolter
Diameter| 1.2 m (3.9 ft)
Focal length| 3.5 m (11 ft)
Collecting area| 1,300 cm2 (200 sq in) @ 1 kev
600 cm2 (93 sq in) @ 7 keV
Wavelengths| X-ray, SIS: 3–0.12 nm (0.4–10 keV)[1]
GIS: 1.8–0.12 nm (0.7–10 keV)[2]
| Instruments

XRT| X-ray Telescope
SIS| Solid-State Imaging Spectrometer
GIS| Gas Imaging Spectrometer

The Advanced Satellite for Cosmology and Astrophysics (ASCA, formerly named ASTRO-D) was the fourth cosmic X-ray astronomy mission by JAXA, and the second for which the United States provided part of the scientific payload. The satellite was successfully launched on 20 February 1993. The first eight months of the ASCA mission were devoted to performance verification. Having established the quality of performance of all ASCA's instruments, the spacecraft provided science observations for the remainder of the mission. In this phase the observing program was open to astronomers based at Japanese and U.S. institutions, as well as those located in member states of the European Space Agency.[3][4]

## Contents

* 1 X-ray astronomy mission
* 2 Significant contributions
* 3 Mission end
* 4 References
* 5 External links

## X-ray astronomy mission

ASCA was the first X-ray astronomy mission to combine imaging capability with a broad passband, good spectral resolution, and a large effective area. The mission also was the first satellite to use CCDs for X-ray astronomy. With these properties, the primary scientific purpose of ASCA was the X-ray spectroscopy of astrophysical plasmas, especially the analysis of discrete features such as emission lines and absorption edges.

ASCA carried four large-area X-ray telescopes. At the focus of two of the telescopes is a gas imaging spectrometer (GIS), while a solid-state imaging spectrometer (SIS) is at the focus of the other two.[3][4] The GIS is a gas-imaging scintillation proportional counter and is based on the GSPC that flew on the second Japanese X-ray astronomy mission, Tenma. The two identical charge-coupled device (CCD) cameras were provided for the two SISs by a hardware team from MIT, Osaka University and ISAS.

## Significant contributions

The ASCA was launched by ISAS (Institute of Space and Astronautical Sciences), Japan.

The sensitivity of ASCA's instruments allowed for the first detailed, broad-band spectra of distant quasars to be derived. In addition, ASCA's suite of instruments provided the best opportunity at the time for identifying the sources whose combined emission makes up the cosmic X-ray background.[3][5]

It performed over 3000 observations, and produced over 1000 publications in refereed journals so far. The ASCA archive contains significant amounts of data for future analyses. Furthermore, the mission is termed highly successful when reflecting on what scientists in many counties have accomplished using ASCA data up to this time.

The U.S. contributed significantly to ASCA's scientific payloads. In return, 40% of ASCA observing time was made available to U.S. scientists. (ISAS also opened up 10% of the time to ESA scientists as a good-will gesture.) In addition, all ASCA data enter the public domain after a suitable period (1 year for U.S. data, 18 months for Japanese data) and become available to scientists worldwide. The design of ASCA was optimized for X-ray spectroscopy; thus it complemented ROSAT (optimized for X-ray imaging) and RXTE (optimized for timing studies). Finally, ASCA results cover almost the entire range of objects, from nearby stars to the most distant objects in the universe.[6]

## Mission end

The mission operated successfully for over 7 years until attitude control was lost on 14 July 2000 during a geomagnetic storm, after which no scientific observations were performed. ASCA reentered the atmosphere on 2 March 2001 after more than 8 years in orbit.

The primary responsibility of the U.S. ASCA GOF was to enable U.S. astronomers to make the best use of the ASCA mission, in close collaboration with the Japanese ASCA team.[7]

## References

This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.

1. ↑ "Solid-state Imaging Spectrometers". 2001-06-25. https://heasarc.gsfc.nasa.gov/docs/asca/asca_sis.html. "Energy Range: 0.4 keV to 10 keV keV"
2. ↑ "Gas Imaging Spectrometers". 2005-04-01. https://heasarc.gsfc.nasa.gov/docs/asca/asca_gis.html. "Energy Range : 0.7 keV to 10 keV"
3. ↑ 3.0 3.1 3.2 "ASCA". NASA Science Missions. NASA. https://science.nasa.gov/missions/asca.
4. ↑ 4.0 4.1 Tanaka, Yasuo; Inoue, Hajime; Holt, Stephen S. (June 1994). "The X-ray astronomy satellite ASCA". Publications of the Astronomical Society of Japan 46 (3): L37–L41. Bibcode: 1994PASJ...46L..37T.
5. ↑ Tsusaka, Yoshiyuki; Suzuki, Hisanori; Yamashita, Koujun; Kunieda, Hideyo; Tawara, Yuzuru et al. (August 1995). "Characterization of the Advanced Satellite for Cosmology and Astrophysics X-ray telescope: Preflight calibration and ray tracing". Applied Optics 34 (22): 4848–4856. doi:10.1364/AO.34.004848. PMID 21052325. Bibcode: 1995ApOpt..34.4848T.
6. ↑ "ASCA's Significant Contributions to Astrophysics". ASCA Guest Observer Facility. NASA. http://heasarc.gsfc.nasa.gov/docs/asca/outreach/asca_asca.html.
7. ↑ "The ASCA Mission: (1993-2000)". NASA. 20 May 2011. http://heasarc.gsfc.nasa.gov/docs/asca/ascagof.html.

## External links

* ASCA website by JAXA
* ASCA website by NASA

* v
* t
* e

Space observatories

Operating|

* AGILE (since 2007)
* AMS-02 (since 2011)
* Aoi (since 2018)
* ASTERIA (since 2017)
* Astrosat (since 2015)
* BRITE constellation (since 2013)
* CALET (since 2015)
* Chandra (AXAF) (since 1999)
* DAMPE (since 2015)
* Fermi (since 2008)
* Gaia (since 2013)
* HXMT (Insight) (since 2017)
* Hinode (Solar-B) (since 2006)
* HiRISE (since 2005)
* Hisaki (SPRINT-A) (since 2013)
* Hubble (since 1990)
* INTEGRAL (since 2002)
* IBEX (since 2008)
* IRIS (since 2013)
* ISS-CREAM (since 2017)
* MAXI (since 2009)
* Mikhailo Lomonosov (since 2016)
* Mini-EUSO (since 2019)
* NCLE (since 2018)
* NEOSSat (since 2013)
* NICER (since 2017)
* NuSTAR (since 2012)
* Odin (since 2001)
* SDO (since 2010)
* SOHO (since 1995)
* SOLAR (since 2008)
* Spektr-RG (since 2019)
* Spitzer (since 2003)
* STEREO (since 2006)
* Swift (since 2004)
* TESS (since 2018)
* WISE (since 2009)
* XMM-Newton (since 1999)

Planned|

* CHEOPS (2019)
* iWF-MAXI (2019)
* Astro-1 Telescope (2020)
* ILO-1 (2020)
* LUCI (2020)
* Nano-JASMINE (2020)
* ORBIS (2020)
* Solar Orbiter (SolO) (2020)
* IXPE (2021)
* James Webb (JWST) (2021)
* LORD (2021)
* SVOM (2021)
* XPoSat (2021)
* Euclid (2022)
* Space Solar Telescope (2022)
* XRISM (2022)
* Xuntian (2022)
* K-EUSO (2023)
* Solar-C (2023)
* SPHEREx (2023)
* Small-JASMINE (2024)
* Near-Earth Object Surveillance Mission (2025+)
* Spektr-UV (2025)
* WFIRST (2025+)
* PLATO (2026)
* LiteBIRD (2027)
* ARIEL (2028)
* Spektr-M (2030+)
* ATHENA (2031)
* LISA (2034)

Proposed|

* Arcus
* AstroSat-2
* EXCEDE
* Fresnel Imager
* FOCAL
* HabEx
* Hibari
* Hypertelescope
* JEM-EUSO
* LUVOIR
* ATLAST
* HDST
* Lynx
* Nautilus Deep Space Observatory
* New Worlds Mission
* NRO donation to NASA
* OST
* PhoENiX
* Solar-D
* SPICA
* THEIA
* THESEUS

Retired|

* Akari (Astro-F) (2006–2011)
* ALEXIS (1993–2005)
* Alouette 1 (1962–1972)
* Ariel 1 (1962, 1964)
* Ariel 2 (1964)
* Ariel 3 (1967–1969)
* Ariel 4 (1971–1972)
* Ariel 5 (1974–1980)
* Ariel 6 (1979–1982)
* ATM (1973–1974)
* ASCA (Astro-D) (1993–2000)
* Astro-1 (1990)
* BBXRT
* HUT
* Astro-2 (HUT) (1995)
* Astron (1983–1989)
* ANS (1974–1976)
* BeppoSAX (1996–2003)
* CHIPSat (2003–2008)
* Compton (CGRO) (1991–2000)
* CoRoT (2006–2013)
* Cos-B (1975–1982)
* COBE (1989–1993)
* DXS (1993)
* EPOCh (2008)
* EPOXI (2010)
* Explorer 11 (1961)
* EXOSAT (1983–1986)
* EUVE (1992–2001)
* FUSE (1999–2007)
* Kvant-1 (1987–2001)
* GALEX (2003–2013)
* Gamma (1990–1992)
* Ginga (Astro-C) (1987–1991)
* Granat (1989–1998)
* Hakucho (CORSA-b) (1979–1985)
* HALCA (MUSES-B) (1997–2005)
* HEAO-1 (1977–1979)
* Herschel (2009–2013)
* Hinotori (Astro-A) (1981–1991)
* HEAO-2 (Einstein Obs.) (1978–1982)
* HEAO-3 (1979–1981)
* HETE-2 (2000–2008)
* Hipparcos (1989–1993)
* IUE (1978–1996)
* IRAS (1983)
* IRTS (1995–1996)
* ISO (1996–1998)
* IXAE (1996–2004)
* Kepler (2009–2018)
* Kristall (1990–2001)
* LEGRI (1997–2002)
* LISA Pathfinder (2015–2017)
* MOST (2003–2019)
* MSX (1996–1997)
* OAO-2 (1968–1973)
* OAO-3 (Copernicus) (1972–1981)
* Orbiting Solar Observatory
* OSO 1
* OSO 2/OSO B
* OSO 3
* OSO 4
* OSO 5
* OSO 6
* OSO 7
* OSO 8
* Orion 1 (1971)
* Orion 2 (1973)
* PAMELA (2006–2016)
* PicSat (2018)
* Planck (2009–2013)
* RELIKT-1 (1983–1984)
* R/HESSI (2002–2018)
* ROSAT (1990–1999)
* RXTE (1995–2012)
* SAMPEX (1992–2004)
* SAS-B (1972–1973)
* SAS-C (1975–1979)
* Solwind (1979–1985)
* Spektr-R (2011–2019)
* Suzaku (Astro-EII) (2005–2015)
* Taiyo (SRATS) (1975–1980)
* Tenma (Astro-B) (1983–1985)
* Uhuru (1970–1973)
* Vanguard 3 (1959)
* WMAP (2001–2010)
* Yokoh (Solar-A) (1991–2001)

Hibernating
(Mission completed)|

* SWAS (1998–2005)
* TRACE (1998–2010)

Lost|

* OAO-1 (1966)
* OAO-B (1970)
* CORSA (1976)
* OSO C (1965)
* ABRIXAS (1999)
* HETE-1 (1996)
* WIRE (1999)
* Astro-E (2000)
* Tsubame (2014–2015)
* Hitomi (Astro-H) (2016)

Cancelled|

* AOSO
* Astro-G
* Constellation-X
* Darwin
* Destiny
* EChO
* Eddington
* FAME
* FINESSE
* GEMS
* HOP
* IXO
* JDEM
* LOFT
* OSO J
* OSO K
* Sentinel
* SIM & SIMlite
* SNAP
* SPOrt
* TAUVEX
* TPF
* XEUS
* XIPE

See also|

* Great Observatories program
* List of space telescopes
* List of proposed space observatories
* List of X-ray space telescopes

* Category

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