Experiment D4/D7, celestial radiometry and space-object radiometry
Equipment for obtaining spectral irradiance measurements from celestial bodies and manmade objects during Gemini space flights
CELESTIAL OBSERVATION↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Use of reaction wheels and nonlinear control for a satellite scanning a small celestial area
Reaction wheel control torque for satellite system scanning of small celestial area
SCANNING↗
Research on celestial mechanics and optimization - Second-order solution of the polar oblateness problem Final report
Second-order solution for motion of satellite about oblate earth, including second, third, and fourth zonal harmonics - celestial mechanics
CELESTIAL MECHANICS↗
NASA conference on celestial mechanics
Abstracts and discussion of topics included in NASA conference on celestial mechanics
CELESTIAL MECHANICS↗
Application of the methods of celestial mechanics to the rigid body problem Final report, 1 Jul. 1965 - 1 Jun. 1966
Celestial mechanics perturbation methods applied to problem of describing motion of rigid artificial earth satellite about its center of mass
CELESTIAL MECHANICS↗
On the Accumulation of Errors at Numerical Integration in Some Problems of Celestial Mechanics
Accumulation of errors using numerical integration methods for solving celestial equations of motion
MOTION EQUATION↗
New one-step integration methods of high-order accuracy applied to some problems in celestial mechanics
One-step methods for numerical integration of initial value problems in ordinary differential equations applied to celestial mechanics
DIFFERENTIAL EQUATION↗
Research program for celestial mechanics
Research program on celestial mechanics for guidance and trajectory control application
GUIDANCE AND CONTROL↗
Sextant sighting performance for space navigation using simulated and real celestial targets.
Manual control sextant sighting performance for space navigation, using simulated and real celestial targets
POSITION ERROR↗
Automatic celestial guidance. II - New challenge to designers' ingenuity.
Electro-optical automatic celestial guidance system for spacecraft and satellites
GUIDANCE SENSOR↗
Polynomial solutions for the equations of celestial mechanics.
Perturbation theories for equations of celestial mechanics, obtaining analytical solutions in terms of Chebyshev polynomial series
CELESTIAL MECHANICS↗
Analysis of sounding rocket data regarding celestial X-ray sources Final report
Celestial observation, sounding rocket data, and emission spectrum used to identify Sco X-1 of Scorpio constellation
EMISSION SPECTRUM↗
Error analysis of celestial-inertial navigation for low-thrust interplanetary vehicles
Error analysis of celestial-inertial navigation for low thrust electrically propelled interplanetary space vehicles
INERTIAL NAVIGATION↗
Periodic solutions for the restricted three-body problem of celestial mechanics
Periodic solutions for restricted three-body problem of celestial mechanics
CELESTIAL MECHANICS↗
Methods of regularization for computing orbits in celestial mechanics
Methods of regularization for computing orbits in celestial mechanics
ORBIT CALCULATION↗
Recent developments in analytical celestial mechanics
Celestial mechanics, and perturbation theory in deriving perturbed precessing elliptic orbits
CELESTIAL MECHANICS↗
Spectra of celestial bodies in the far ultraviolet region
Atmospheric and interstellar absorption, and spectra of celestial bodies in far ultraviolet
ATMOSPHERIC ABSORPTION↗
The Celestial Reference Frame at X/Ka-band (8.4/32 GHz)
A celestial reference frame at X/Ka-band (8.4/32 GHz) has been constructed using fifty-one 24-hour sessions with the Deep Space Network. We report on observations which have detected 436 sources covering the full 24 hours of right ascension and declinations down to -45 deg. Comparison of this X/Ka-band frame to the S/X-band (2.3/8.4 GHz) ICRF2 shows wRMS agreement of 200 micro-arcsec in a cos delta and 290 micro-arcsec in delta. There is evidence for zonal errors at the 100 micro-arcsec level. Known errors include limited SNR, lack of phase calibration, troposphere mismodelling, and limited southern geometry. The motivations for extending the ICRF to frequencies above 8 GHz are to access more compact source morphology for improved frame stability, to provide calibrators for phase referencing, and to support spacecraft navigation at Ka-band.
reference systems catalog↗