1. Incorporating Hubble Servicing with NASA’s Long-Term Vision
Presented at the Space Telescope Science Institute
December 1, 2016
Frank Cepollina | Satellite Servicing Projects Division (SSPD)
NASA’s Goddard Space Flight Center |

2. Servicing with Dream Chaser
Study concept

3. Satellite Servicing Projects Division
The next step…

4. HST Second Radial Instrument (SRI) Concept
Interim Status
September 23, 2009

5. Mechanical Layout (Per FGS Bay)

6. HiFi Mechanical Simulator (HFMS) Examined to Confirm Available Clearances
Oversized hole allows for unimpeded access to the entire hub area.
SRI Concept
September 23, 2009

7. Near Earth Orbit Detector and Characterization (NEODaC) Detector
Engineering Development Unit Focal Plane Array – 4 Active Detectors, 4 Dummy Detectors
NEODaC instrument
CCD from HST
>75 Million Pixels
Silicon Carbon baseplate, extremely flat and dimensionally stable
Modular design, easy integration and alignment
Individual thermal control, excellent stability, supports cryogenic operating temperature

8. New Sensor For NEODaC Being Developed to Demonstrate Performance
For the NEODaC project, Raytheon Vision Systems is providing a new visible sensor for low-light applications
CMOS ROIC with thinned Si sensor provides radiation-hardness
Easily mosaicked since all key interfaces are digital
Si sensor technology benefits from all the process improvements put into CCDs over the years
A mosaic of 3x2 devices, each 4K x 4K with 10 mm pixel pitch, can cover the entire FGS field of view
Provides imaging from the near-UV through the visible.
Thermoelectric cooling can support dark current less than 0.1 e-/sec
The device can also operate very fast (up to 100 Hz frame rates), opening up potential applications in time-resolved imaging

9. Gyroscope Performance Comparison
L3 CIRUS Gyro
HST Gyro
Bias Stability
deg/hr.
5 deg/hr.
Angle Random Walk
deg/rt hr.
Angle White Noise
arc-sec/rt-Hz.
~0.004 arc-sec/rt-Hz.
Angular Rate Range
>22 deg/sec.
SF Stability
+/- 2ppm
70 ppm/month
SF Linearity (max.)
35 ppm (20 typical)

10. Servicing with CST-100
Study concept

11. Double Airlock Habitat Module
Study concept

12. Servicing with Orion
Study concept

13. Where Do We Go from Here?
We have within our reach the solutions to the engineering problems facing HST
With our national investment in launch vehicles and commercial space flight and crew, we have the long range capability to make this happen
But you must WANT IT!
And speak out for such a cost-effective near-term solution to a UV-optical telescope!