PERFORMANCE CHARACTERIZATION OF THE HUBBLE SPACE TELESCOPE RATE GYRO ASSEMBLY11Work supported by NASA Marshall Space Flight Center, Huntsville, Alabama under Contract NAS8-32697 and Allied Bendix Aerospace Corporation internal research and development funding.

1986 ◽  
pp. 219-222
Author(s):  
H. Dougherty ◽  
J. Rodden ◽  
L.F. Reschke ◽  
K. Tompetrini ◽  
S.P. Weinstein ◽  
...  
Keyword(s):  
Research And Development ◽  
Space Flight ◽  
Hubble Space Telescope ◽  
Performance Characterization ◽  
Space Telescope ◽  
Rate Gyro ◽  
Aerospace Corporation ◽  
Nasa Marshall Space

Performance Characterization of the Hubble Space Telescope Rate Gyro Assembly

1985 ◽  
Vol 18 (4) ◽  
pp. 219-222 ◽  
Author(s):  
H. Dougherty ◽  
J. Rodden ◽  
L.F. Reschke ◽  
K. Tompetrini ◽  
S.P. Weinstein ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Performance Characterization ◽  
Space Telescope ◽  
Rate Gyro

Initial Characterization of Active Transitioning Centaur, P/2019 LD2 (ATLAS)

2021 ◽  
Author(s):  
Bryce Bolin ◽  
Yanga Fernandez ◽  
Carey Lisse ◽  
Timothy Holt
Keyword(s):  
Cross Section ◽  
Hubble Space Telescope ◽  
Gas Production ◽  
Wide Field ◽  
Imaging Spectrometer ◽  
Space Telescope ◽  
Resolution Imaging ◽  
Array Camera

<p>We present visible and mid-infrared imagery and photometry of temporary Jovian co-orbital comet P/2019 LD2 taken with Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3), Spitzer Space Telescope/Infrared Array Camera (Spitzer/IRAC), and the GROWTH telescope network, visible spectroscopy from Keck/Low-Resolution Imaging Spectrometer (LRIS), and archival Zwicky Transient Facility observations taken between 2019 April and 2020 August. Our observations indicate that the nucleus of LD2 has a radius between 0.2 and 1.8 km assuming a 0.08 albedo and a coma dominated by ∼100 μm-scale dust ejected at ∼1m s−1 speeds with a ∼1'' jet pointing in the southwest direction. LD2 experienced a total dust mass loss of ∼108 kg at a loss rate of ∼6 kg s<sup>−1</sup> with Afρ/ cross-section varying between ∼85 cm/125 km<sup>2</sup> and ∼200 cm/310 km<sup>2</sup> from 2019 April 9 to 2019 November 8. If the increase in Afρ/cross section remained constant, it implies LD2ʼs activity began ∼2018 November when within 4.8 au of the Sun, implying the onset of H2O sublimation. We measure CO/CO<sub>2</sub> gas production of <10<sup>27</sup> mol s<sup>−1</sup>/<10<sup>26</sup> mol s<sup>−1</sup> from our 4.5 μm Spitzer observations; g–r = 0.59 ± 0.03, r–i = 0.18 ± 0.05, and i– z = 0.01 ± 0.07 from GROWTH observations; and H2O gas production of <80 kg s<sup>−1</sup> scaling from our estimated C<sub>2</sub> production of Q<sub>C2</sub> < 7.5 x 10<sup>24</sup> mol s<sup>−1</sup> from Keck/LRIS spectroscopy. We determine that the long-term orbit of LD2 is similar to Jupiter-family comets having close encounters with Jupiter within ∼0.5 Hill radius in the last ∼3 y and within 0.8 Hill radius in ∼9 y. Additionally, 78.8% of our orbital clones are ejected from the solar system within 10<sup>6</sup> yr, having a dynamical half-life of 3.4 × 10<sup>5</sup> yr.</p>

Characterization of infrared filters for the wide-field camera 3 of Hubble Space Telescope

2001 ◽  
Author(s):  
Rene A. Boucarut ◽  
Manuel A. Quijada ◽  
Olivia L. Lupie ◽  
Sharon M. Struss ◽  
Linda A. Miner
Keyword(s):  
Hubble Space Telescope ◽  
Wide Field ◽  
Space Telescope

scholarly journals In a Mechanism Far, Far Away

2004 ◽  
Vol 126 (04) ◽  
pp. 40-41
Keyword(s):  
Space Flight ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Primary Mirror ◽  
Nasa Goddard Space ◽  
James Webb Space Telescope ◽  
Goddard Space Flight Center ◽  
Nose Cone ◽  
Low Mass ◽  
Made In

This article describes features of James Webb Space Telescope, which is going to take the place of the Hubble Space Telescope in 2011. The Webb telescope is an orbiting infrared observatory, and the project is managed by the NASA Goddard Space Flight Center in Greenbelt, Maryland. The Webb Space Telescope will use extremely large aperture, low-mass mirrors. Made in segments so they can be folded to fit into a rocket nose cone for flight, they will open and array themselves when they reach their destination. These robust mirrors must be fabricated rapidly and cost-effectively. There are significant manufacturing challenges in the composite backplanes for the primary mirror. These are to be made from boron composites for their stiffness. The analysis and manufacturing challenges in the backplane are the adhesives used to combine all the composite parts and the uniformity to which the composites themselves can be manufactured. The structure of the primary mirror for the Webb Telescope permits small adjustments.

Sign in / Sign up

Export Citation Format

Share Document