HALCA

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HALCA
NamesMUSES-B
VSOP
Mission typeAstronomy
OperatorISAS
COSPAR ID1997-005A
SATCAT no.24720
WebsiteHALCA Home
Mission duration8 years, 9 months, 18 days
Spacecraft properties
ManufacturerNEC Toshiba Space Systems
Launch mass830 kg (1,830 lb)
Dimensions1.5 m × 1 m (4.9 ft × 3.3 ft)
Start of mission
Launch date04:50, February 12, 1997 (UTC) (1997-02-12T04:50Z)
RocketM-5-1
Launch siteKagoshima M-V Pad
End of mission
Disposaldecommissioned
DeactivatedNovember 30, 2005 (2005-11-30)
Orbital parameters
Reference systemGeocentric
RegimeHighly elliptical
Semi-major axis17,259 km (10,724 mi)
Eccentricity0.5999671
Perigee533.5 km (331.5 mi)
Apogee21,244.1 km (13,200.5 mi)
Inclination31.1880 degrees
Period376.1 minutes
RAAN127.6566 degrees
Argument of perigee143.9533 degrees
Mean anomaly358.3371 degrees
Mean motion3.82867831 rev/day
Epoch28 April 2016, 09:56:58 UTC[1]
Revolution no.26766
Main telescope
TypeMesh antenna
Diameter8 m (26 ft)
Wavelengths1.3, 6, 18 cm (radio)
 

HALCA (Highly Advanced Laboratory for Communications and Astronomy), also known for its project name VSOP (VLBI Space Observatory Programme), or the code name MUSES-B (for the second of the Mu Space Engineering Spacecraft series), is a Japanese 8 meter diameter radio telescope satellite which was used for Very Long Baseline Interferometry (VLBI). It was the first such space-borne dedicated VLBI mission.

History[edit]

It was placed in a highly elliptical orbit with an apogee altitude of 21,400 km and a perigee altitude of 560 km, with an orbital period of approximately 6.3 hours. This orbit allowed imaging of celestial radio sources by the satellite in conjunction with an array of ground-based radio telescopes, such that both good (u,v) plane coverage and very high resolution were obtained.

Although designed to observe in three frequency bands: 1.6 GHz, 5.0 GHz, and 22 GHz, it was found that the sensitivity of the 22 GHz band had severely degraded after orbital deployment, probably caused by vibrational deformation of the dish shape at launch, thus limiting observations to the 1.6 GHz and 5.0 GHz bands.

HALCA was launched in February 1997 from Kagoshima Space Center, and made its final VSOP observations in October 2003, far exceeding its 3-year predicted lifespan, before the loss of attitude control. All operations were officially ended in November 2005. [2]

A follow-up mission ASTRO-G (VSOP-2) was planned, with a proposed launch date of 2012, but the project was eventually cancelled in 2011 due to increasing costs and the difficulties of achieving its science goals. It was expected to achieve resolutions up to ten times higher and up to ten times greater sensitivity than its predecessor HALCA.

The cancellation of ASTRO-G leaves the Russian Spektr-R mission as the only currently operational space VLBI facility.

Highlights[edit]

  • Observations of hydroxyl masers and pulsars at 1.6 GHz
  • Detection of interference fringes for quasar PKS1519-273 between HALCA and terrestrial radio telescopes
  • Routines imaging of quasars and radio galaxies etc. by means of experimental VLBI observations with HALCA and terrestrial radio telescope networks

References[edit]

  1. ^ "HALCA (MUSES-B) Satellite details 1997-005A NORAD 24720". N2YO. 28 April 2016. Retrieved 28 April 2016.
  2. ^ http://www.vsop.isas.jaxa.jp/obs/news/www.161.html

External links[edit]