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Tahiti: Site Log
Instructions and Update Site Log
You can use the hyperlinks to quickly get to the section of interest or you can scroll down to read them all.
Section: 0. Form
Section: 1. Identification of the Ranging System Reference Point (SRP)
Section: 2. Site Location Information
Section: 3. General System Information
Section: 4. Telescope Information
Section: 5. Laser System Information
Section: 6. Receiver System
Section: 7. Tracking Capabilities
Section: 8. Calibration
Section: 9. Time and Frequency Standards
Section: 10. Preprocessing Information
Section: 11. Aircraft Detection
Section: 12. Meteorological Instrumentation
Section: 13. Local Ties, Eccentricities, and Collocation Information
Section: 14. Local Events Possibly Affecting Computed Position
Section: 15. On-Site, Point of Contact Agency Information
Section: 16. Responsible Agency (if different from 15.)
Section: 17. More Information
ILRS Site and System Information Form
International Laser Ranging Service
0. Form
Prepared by (Full Name) : Robin L Dixon
Preparer E-mail : rdixon07@peraton.com
Date Prepared : 2023-06-29
Report Type : UPDATE
Site Log Format Version : 2.0
Site Log Revision :
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1. Identification of the Ranging System Reference Point (SRP)
Site Name : Tahiti Geodetic Observatory
IERS DOMES Number : 92201M007
CDP Pad ID : 7124
Subnetwork : NASA
Description : MONUMENT
Monument Description : PLATE
Monument Inscription : NONE
Mark Description : CHISELLED CROSS
Date Installed : 1997-08-01
Date Removed :
Geologic Characteristic : CONGLOMERATE
Additional Information :
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2. Site Location Information
City or Town : Punaauia
State or Province : Tahiti
Country : French Polynesia
Tectonic Plate : Pacific
Local Time (UTC +/- hours) :
Approximate Position
X coordinate [m]: -5246406.607
Y coordinate [m]: -3077285.162
Z coordinate [m]: -1913814.321
Latitude [deg]: 17.5768 S
Longitude [deg]: 210.3937 E
Elevation [m]: 82.171
Survey Method :
Date Measured :
Additional Information :
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3. General System Information
3.01 System Name : MOBLAS-8
4-Character Code : THTL
CDP System Number : 08
CDP Occupation Number : 02
Eccentricity to SRP (if Not Identical With SRP)
North [m]: -0.015 +- 0.002
East [m]: 0.011 +- 0.002
Up [m]: 3.143 +- 0.002
Date Measured : 1999-12-15
Date Installed : 1997-08-01
Date Removed :
Additional Information : The eccentricities in this section may not
: be current and may not contain the entire
: history. The official set of site
: eccentricities are maintained in the
: following two SINEX data bases at:
:
: https://cddis.nasa.gov/archive/
: slr/slrocc/ecc_xyz.snx
:
: and
:
: https://cddis.nasa.gov/archive/
: slr/slrocc/ecc_une.snx
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4. Telescope Information
4.01 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.762
Mount : AZ-EL
Date Installed :
Date Removed :
Xmitting Telescope Type : REFRACTOR
Aperture [m]: 0.163
Date Installed :
Date Removed :
Tracking Camera Type : CCD
Model : GEN II INTENSIFIER
Manufacturer : HTSI
Field of View [deg]:
Minimum Magnitude [mag]:
Date Installed :
Date Removed :
Transmit/Receive Path : SEPARATE
Transmit/Receive Switch : NONE
Max Slew Rate Az [deg/s]: 20
Max Slew Rate El [deg/s]: 5
Max Used Tracking Rate Az : 5
Max Used Tracking Rate El : 2
Telescope Shelter : ROLL-BACK ROOF
Daylight Filter Type : Omega Optical 532NB1 9114
Dayl. Filt. Bandwidth [nm]: 100
Adjustable Attenuation : RECEIVE
Adjustable Field of View :
Transmit Efficiency : 0.94
Receive Efficiency : 0.76
Date Installed : 1997-08-01
Date Removed :
Additional Information :
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5. Laser System Information
5.01 Laser Type : ND:YAG
Model :
Manufacturer :
Number of Amplifiers : 1
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]: 200
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 100
Xmit Energy Adjustable : YES
Additional Information :
Pulse Width (FWHM) [ps]: 200
Max. Repetition Rate [Hz]: 10
Fullw. Beam Divergence ["]: 30
Theoretical Beam Div :
Measured Beam Div :
Method Used :
Additional Information :
Final Beam Diameter [m]: 0.093
Eyesafe : NO
Eyesafe Standard : ANSI 136.1
Polarization on Exit :
Laser Fire Control :
Laser Energy Monitor :
Start Diode Type :
Manufactorer :
Model :
Quantum Efficiency [%]:
Rise/Fall Time [ps]:
Date Installed :
Date Removed :
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Additional Information :
Date Installed : 1997-08-01
Date Removed :
Additional Information : 1) Laser repetition rate is 10 Hz
: 2) Saturable laser upgrade 2008-04-08
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6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : ITT
Model : F4129F
Quantum Efficiency [%]: 17.7
Nominal Gain : 1e6
Rise Time [ps]: 350
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 1997-08-01
Date Removed : 2008-06-27
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Few to Multi Photons
Additional Information:
Time of Flight Observ. : INTERVAL
Manufacturer : Hewlett-Packard
Model : 5370B
Resolution [ps]: 20
Precision [ps]: 35
Date Installed : 1997-08-01
Date Removed : 2020-05-04
Additional Information :
6.01.02 Primary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : Photek
Model : PMT318
Quantum Efficiency [%]: 13.12
Nominal Gain : 1e7
Rise Time [ps]: 250
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 2008-06-27
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Few to Multi Photons
Additional Information:
Time of Flight Observ. : INTERVAL
Manufacturer : Hewlett-Packard
Model : 5370B
Resolution [ps]: 20
Precision [ps]: 35
Date Installed : 1997-08-01
Date Removed : 2020-05-04
Additional Information :
6.01.03 Primary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : Photek
Model : PMT318
Quantum Efficiency [%]: 13.12
Nominal Gain : 1e7
Rise Time [ps]: 2
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 2008-06-27
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Ten
Model : TC
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Few to Multi Photons
Additional Information:
Time of Flight Observ. : Epoch
Manufacturer : Cybioms
Model : cybi-ETM-02
Resolution [ps]: 1
Precision [ps]: 3
Date Installed : 2019-10-22
Date Removed :
Additional Information : The HP5370B is no longer primary as of 2020-
: 05-04, its data is not sent to the SLR data
: centers. First available data from the ETM
: was provided on 2019-10-22, and was released
: from quarantine on 2020-05-04.
6.02.01 Secondary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : ITT
Model : F4129F
Quantum Efficiency [%]: 17.7
Nominal Gain : 1e6
Rise Time [ps]: 350
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 1997-08-01
Date Removed : 2008-06-27
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Single to Multi Photons
Additional Information:
Time of Flight Observ. : INTERVAL
Manufacturer : Hewlett-Packard
Model : 5370B
Resolution [ps]: 20
Precision [ps]: 35
Date Installed : 1997-08-01
Date Removed :
Additional Information : High sensivity laser receiver configuration
: installed 14-May-2012. Everything is the same
: as the primary chain except the discriminator
: threshold has been lowered to accept single
: photons and then amplified with 24db of gain.
6.02.02 Secondary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : Photek
Model : PMT
Quantum Efficiency [%]: 13.12
Nominal Gain : 1e7
Rise Time [ps]: 250
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 2008-06-27
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : CFD
Manufacturer : Tennelec
Model : TC454
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Single to Multi Photons
Additional Information:
Time of Flight Observ. : INTERVAL
Manufacturer : Hewlett-Packard
Model : 5370B
Resolution [ps]: 20
Precision [ps]: 35
Date Installed : 1997-08-01
Date Removed : 2020-05-04
Additional Information : High sensivity laser receiver configuration
: installed 14-May-2012. Everything is the same
: as the primary chain except the discriminator
: threshold has been lowered to accept single
: photons and then amplified with 24db of gain.
6.02.03 Secondary Chain
Wavelength [nm]: 532
Detector Type : MCP
Manufacturer : Photek
Model : PMT
Quantum Efficiency [%]: 13.12
Nominal Gain : 1e7
Rise Time [ps]: 2
Jitter (Single PE)[ps]: 100
Field of View Diam ["]: 360
Date Installed : 2008-06-27
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : C
Manufacturer : T
Model : TC
Date Installed : 1997-08-01
Date Removed :
Amplitude Measurement : YES
Return-Rate Controlled: YES
Mode of Operation : Few to Multi Photons
Additional Information:
Time of Flight Observ. : Epoch
Manufacturer : Cybio
Model : cybi-ETM-02
Resolution [ps]: 1
Precision [ps]: 3
Date Installed : 2019-10-22
Date Removed :
Additional Information : High sensivity laser receiver configuration
: installed 14-May-2012. Everything is the same
: as the primary chain except the discriminator
: threshold has been lowered to accept single
: photons and then amplified with 24db of gain.
:
: The HP5370B is no longer primary as of 2020-
: 05-04, its data is not sent to the SLR data
: centers. ETM data was first collected on
: 2019-10-22, and was released from quarantine
: on 2020-05-04.
6.03.01 Tertiary Chain
Wavelength [nm]:
Detector Type :
Manufacturer :
Model :
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed :
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled:
Mode of Operation :
Additional Information:
Time of Flight Observ. :
Manufacturer :
Model :
Resolution [ps]:
Precision [ps]:
Date Installed :
Date Removed :
Additional Information :
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7. Tracking Capabilities
7.01 Satellites
Very Low Alt (<400 km) : YES
Low Altitude (400-2000) : YES
LAGEOS/LARES : YES
GLONASS : YES
Etalon : YES
GNSS : NO
Geosynchronous :
Moon : NO
Ave. Pass Switch Time [s]: 60
Average values for LAGEOS
Single Shot RMS [mm]: 10
# of Obs per NP : 50
Use of Semi-trains : NO
# of Semi-train Tracks : N.A.
Range Gate Width [ns]: 2000
Beam Pointing Accuracy ["]: 0.6
Angle Encoder Resolution["]: 0.6
Min. Tracking Elev. [deg]: 20
Laser Polarization @emitter:
Operation
Months per Year : 12
Days per Week : 5
Hours per Day : 16
Staff per Shift : 1
System Shared With : NOTHING
Time Allocated to SLR [%]: 100
Remotely Controllable : NO
Tracking Restrictions
Go/No-go flag :
Satellite Verification :
Date Verified :
Maximum elevation :
Satellite Verification :
Date Verified :
Pass segments :
Satellite Verification :
Date Verified :
Schedule segments :
Satellite Verification :
Date Verified :
Maximum laser power limit:
Satellite Verification :
Date Verified :
Date First Applicable : 1997-08-01 HH:MM UT
Date Last Applicable :
Additional Information : station is not available for ranging on
: holidays
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8. Calibration
8.01 Calibration Type : PRE+POST
Target Location : EXTERNAL
Target Type : CORNER CUBE
Target Structure : CONCRETE PIER
Number of Targets :
Target Distance(s) [m]: 263
Date Measured : 1999-12-15
Accuracy [mm]: 2
Verification : first order survey and ranging to
: multiple ground targets
Return-Rate Controlled : YES
Eye-Safe Method :
Additional Information :
Mode of Operation : FEW/MULTI PHOTON
Calibration performed : 3.5
Single Shot RMS [mm]: 6
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : N.A.
Application of Cal Data : AVERAGE
Date Installed : 1997-08-01
Date Removed :
Additional Information :
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9. Time and Frequency Standards
9.01.01 Frequency Standard Type : Rubidium disciplined by GPS
Model : XL-DC 151-358-108-2
Manufacturer : Symmetricom (TrueTime)
Short Term Stab. [e-12]: 10
Long Term Stab. [e-12]: 3
Time Reference : GPS
Synchronization : GPS
Epoch Accuracy [ns]: 100
Date Installed : 1999-08-19
Date Removed : 2023-04-06
Additional Information :
9.01.02 Frequency Standard Type : GPS Steered Rubidium
Model : FS740
Manufacturer : Stanford Research
Short Term Stab. [e-12]: 100
Long Term Stab. [e-12]: 3
Time Reference : GPS
Synchronization : GPS
Epoch Accuracy [ns]: 150
Date Installed : 2023-04-06
Date Removed :
Additional Information : Actual accuracy of UTC is less then 100 ns.
9.02.01 GNSS Timing Rcvr Model : XL-DC 151-358-108-2
Manufacturer : Symmetricom (TrueTime)
Date Installed : 1999-08-12
Date Removed :
Additional Information : CNS clock used for comparisons
9.03.01 One-way System Calibration
Date performed :
Direction Calibrated :
Additional Information :
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10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : IRV+POLYNOMIAL
Return-Rate Rejection :
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : NONE
Upload interval : HOURLY
Date First Applicable : 1997-08-01 HH:MM UT
Date Last Applicable : 2002-02-03 HH:MM UT
Additional Information :
10.02 On-site NP Generation : YES
Data Screening : IRV+POLYNOMIAL
Return-Rate Rejection :
Edit Criterion 1st Chain : ITERATIVE 3.0 SIGMA
Edit Criterion 2nd Chain : NONE
Upload interval : HOURLY
Date First Applicable : 2002-02-03 HH:MM UT
Date Last Applicable :
Additional Information : Generic Normal Processing Version 2.0
: installed 2002-02-03
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11. Aircraft Detection
11.01 Detection Type : RADAR
Manufacturer/Provider :
Automatic Laser Shutoff :
Alarms Recorded :
Hazard Distance [km]:
Date Installed : 1997-08-01
Date Removed :
Additional Information :
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12. Meteorological Instrumentation
12.01.01 Pressure Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : PER PULSE
Accuracy [mbar]: 0.1
Height Diff to SRP [m]: -0.15
Distance from SRP [m]:
Date Installed : 2000-04-25 HH:MM UT
Calibration Interval : YEARLY
Date Removed : 2011-07-11 HH:MM UT
Additional Information :
12.01.02 Pressure Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : PER PULSE
Accuracy [mbar]: 0.08
Height Diff to SRP [m]: -0.15
Distance from SRP [m]:
Date Installed : 2011-07-11 HH:MM UT
Calibration Interval : biyearly
Date Removed :
Additional Information :
12.02.01 Temp Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : PER PULSE
Accuracy [deg C]: 0.5
Date Installed : 2000-04-25 HH:MM UT
Calibration Interval : YEARLY
Date Removed : 2011-07-11 HH:MM UT
Additional Information :
12.02.02 Temp Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : EVERY PULSE
Accuracy [deg C]: 0.2
Date Installed : 2011-07-11 HH:MM UT
Calibration Interval : BIYEARLY
Date Removed :
Additional Information :
12.03.01 Humidity Sensor Model : MET3
Manufacturer : Paroscientific
Recording Interval : PER PULSE
Accuracy [% rel h]: 2
Date Installed : 2000-04-25 HH:MM UT
Calibration Interval : YEARLY
Date Removed : 2011-07-11 HH:MM UT
Additional Information :
12.03.02 Humidity Sensor Model : MET4
Manufacturer : Paroscientific
Recording Interval : PER PASS
Accuracy [% rel h]: 2
Date Installed : 2011-07-11 HH:MM UT
Calibration Interval : BIYEARLY
Date Removed :
Additional Information :
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13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
13.01.01.01 GNSS : IGS
Date Installed : 1998-11-22
Date Removed :
Additional Info :
13.01.01.02 GNSS : IGS
Date Installed : 2000-08-25
Date Removed :
Additional Info :
13.01.01.03 GNSS : NO
Date Installed :
Date Removed :
Additional Info :
13.01.02.01 DORIS : IDS
Date Installed : 1998-04-16
Date Removed :
Additional Info : PAQB
13.01.02.02 DORIS : IDS
Date Installed : 1995-07-27
Date Removed : 1998-04-13
Additional Info : PAPB
13.01.03.01 PRARE : YES
Date Installed : 1996-08-16
Date Removed :
Additional Info :
13.01.04.01 VLBI : NO
Date Installed :
Date Removed :
Additional Info :
13.01.05.01 Gravimeter : NO
Date Installed :
Date Removed :
Additional Info :
13.01.06.01 Other SLR :
Date Installed :
Date Removed :
Additional Info :
13.02.01.01 Local Ties from the SRP to Other Monuments or Systems on Site
Monument Name :
Instrumentation Type :
Instrumentation Status :
DOMES Number :
CDP Number :
Differential Components (ITRS)
dx [m]:
dy [m]:
dz [m]:
Date Measured :
Determined by :
Date Installed :
Date Removed :
Additional Information :
13.03.01.01 Eccentricities Between Other Monuments on Site
From: Monument Name : MOBLAS-8
DOMES Number : 92201M007
CDP Number : 7124
To: Monument Name : PAPB DORIS
DOMES Number : 92201S007
CDP Number : N.A.
Differential Components (ITRS)
dx [m]: -173.0775 +- 0.002
dy [m]: 311.888 +- 0.002
dz [m]: 37.0642 +- 0.002
Date Measured :
Determined by : IGN
Additional Information : values in previous site log were
: in error
13.03.02.01 Eccentricities Between Other Monuments on Site
From: Monument Name : MOBLAS-8
DOMES Number : 92201M007
CDP Number : 7124
To: Monument Name : PAQB
DOMES Number : 92201S008
CDP Number : N.A.
Differential Components (ITRS)
dx [m]: -7.3265 +- 0.002
dy [m]: 18.193 +- 0.002
dz [m]: -25.9328 +- 0.002
Date Measured :
Determined by : IGN
Additional Information :
13.03.03.01 Eccentricities Between Other Monuments on Site
From: Monument Name : MOBLAS-8
DOMES Number : 92201M007
CDP Number : 7124
To: Monument Name : TAHI
DOMES Number : 92201M006
CDP Number : N.A.
Differential Components (ITRS)
dx [m]: -162.0445 +- 0.002
dy [m]: 295.485 +- 0.002
dz [m]: 36.6482 +- 0.002
Date Measured :
Determined by : IGN
Additional Information :
13.03.04.01 Eccentricities Between Other Monuments on Site
From: Monument Name : MOBLAS-8
DOMES Number : 92201M007
CDP Number : 7124
To: Monument Name : THTI
DOMES Number : 92201M009
CDP Number : N.A.
Differential Components (ITRS)
dx [m]: -8.4555 +- 0.002
dy [m]: 24.551 +- 0.002
dz [m]: -28.2988 +- 0.002
Date Measured :
Determined by : IGN
Additional Information :
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14. Local Events Possibly Affecting Computed Position
14.01 Date :
Event :
Additional Information :
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15. On-Site, Point of Contact Agency Information
Agency : Tahiti Geodetic Observatory
Mailing Address : UPF, BP 6570, 98702 Faaa Aeroport,
: Tahiti - French Polynesia
Website :
Primary Contact
Contact Name : Jean-Pierre Barriot
Telephone (primary) : (689) 803 884
Telephone (secondary) : (689) 866 426
Fax : (689) 803 842
E-mail : barriot@upf.pf
Secondary Contact
Contact Name : Yannick Vota
Telephone (primary) : (689) 866 426
Telephone (secondary) : (689) 710 707
Fax : (689) 803 842
E-mail : Yannick.Vota@upf.pf
Tertiary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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16. Responsible Agency (if different from 15.)
Agency : NASA
Mailing Address : Goddard Space Flight Center, Code 61A
: 8800 Greenbelt Road
: Greenbelt, MD 20771 USA
Primary Contact
Contact Name : Dorman Jeffrey
Telephone (primary) : 301-286-1128
Telephone (secondary) :
Fax :
E-mail : jeffrey.l.dorman@nasa.gov
Secondary Contact
Contact Name : Stephen Merkowitz
Telephone (primary) : 301-286-9412
Telephone (secondary) :
Fax :
E-mail : stephen.m.merkowitz@nasa.gov
Additional Information :
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17. More Information
URL for More Information : http://gepasud.upf.pf/
Hardcopy on File
Site Map : NO
Site Diagram : NO
Horizon Mask : NO
Monument Description : NO
Site Pictures : NO
Additional Information :
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- Web Curator: Lori J. Tyahla
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- Last modified date: Apr 5, 2024
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