ILRS Site and System Information Form
      International Laser Ranging Service

 0.   Form

      Prepared by (Full Name)    : Evan Hoffman
      Preparer E-mail            : evan.d.hoffman@nasa.gov
      Date Prepared              : 2022-09-01
      Report Type                : UPDATE
      Site Log Format Version    : 2.0
      Site Log Revision          : 


 1.   Identification of the Ranging System Reference Point (SRP)

      Site Name                  : APOLLO
      IERS DOMES Number          : 49447S001
      CDP Pad ID                 : 7045
      Subnetwork                 : N/A
      Description                : AZ EL INTERSECT
      Monument Description       : N/A
      Monument Inscription       : N/A
      Mark Description           : N/A
      Date Installed             : N.A.
      Date Removed               : N.A.
      Geologic Characteristic    : BEDROCK
      Additional Information     : Axis intersection of 3.5 m APO telescope


 2.   Site Location Information

      City or Town               : Sunspot
      State or Province          : NM
      Country                    : USA
      Tectonic Plate             : 
      Local Time (UTC +/- hours) : 
      Approximate Position
        X coordinate          [m]: 
        Y coordinate          [m]: 
        Z coordinate          [m]: 
        Latitude            [deg]: 32.780361 N
        Longitude           [deg]: 105.820417 W
        Elevation             [m]: 2788
      Survey Method              : 
      Date Measured              : 
      Additional Information     : 


 3.   General System Information

 3.01 System Name                : APOLLO
      4-Character Code           : APOL
      CDP System Number          : 95
      CDP Occupation Number      : 01
      Eccentricity to SRP (if Not Identical With SRP)
        North                 [m]: N.A.
        East                  [m]: N.A.
        Up                    [m]: N.A.
        Date Measured            : N.A.
      Date Installed             : 2005-10-15
      Date Removed               : N.A.
      Additional Information     : 


 4.   Telescope Information

 4.01 Receiving Telescope Type   : FOLDED RITCHE-CHRETIEN
        Aperture              [m]: 3.5
        Mount                    : AZ-EL
      Date Installed             : 
      Date Removed               : 
      Xmitting Telescope Type    : FOLDED RITCHE-CHRETIEN
        Aperture              [m]: 3.5
      Date Installed             : 
      Date Removed               : 
      Tracking Camera Type       : CCD
        Model                    : STV
        Manufacturer             : SBIG
        Field of View       [deg]: 0.011
        Minimum Magnitude   [mag]: 13
      Date Installed             : 
      Date Removed               : 
      Transmit/Receive Path      : COMMON BENT CASSEGRAIN
      Transmit/Receive Switch    : ROTATING MIRROR
      Max Slew Rate Az    [deg/s]: 2.0 
      Max Slew Rate El    [deg/s]: 2.0
      Max Used Tracking Rate Az  : 1.5
      Max Used Tracking Rate El  : 1.5
      Telescope Shelter          : DOME
      Daylight Filter Type       : N/A
      Dayl. Filt. Bandwidth  [nm]: N.A.
      Adjustable Attenuation     : NO
      Adjustable Field of View   : 
      Transmit Efficiency        : 0.6
      Receive Efficiency         : 0.4
      Date Installed             : 2005-10-15
      Date Removed               : 
      Additional Information     : 


 5.   Laser System Information

 5.01 Laser Type                 : ND:YAG
      Model                      : 
      Manufacturer               : 
      Number of Amplifiers       : 1
      Primary Wavelength     [nm]: 532
      Primary Maximum Energy [mJ]: 115
      Secondary Wavelength   [nm]: 
      Secondary Max. Energy  [mJ]: 
      Xmit Energy Adjustable     : NO
        Additional Information   : 
      Pulse Width (FWHM)     [ps]: 100
      Max. Repetition Rate   [Hz]: 20
      Fullw. Beam Divergence  ["]: 1.0
        Theoretical Beam Div     : 
        Measured Beam Div        : 
          Method Used            : 
          Additional Information : 
      Final Beam Diameter     [m]: 2.5
      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             : 2005-10-15
      Date Removed               : 
      Additional Information     : 


 6.   Receiver System

 6.01.01 Primary Chain
         Wavelength          [nm]: 532
         Detector Type           : SPAD ARRAY
           Manufacturer          : Lincoln Lab 
           Model                 : 4x4 prototype
           Quantum Efficiency [%]: 30
           Nominal Gain          : N.A.
           Rise Time         [ps]: 500
           Jitter (Single PE)[ps]: 50
           Field of View Diam ["]: 1.4
           Date Installed        : 2005-10-15
           Date Removed          : 
         Amplifier Type          : 
           Manufacturer          : 
           Model                 : 
           Gain                  : 
           Bandwidth             : 
           Date Installed        : 
           Date Removed          : 
           Additional Information: 
         Signal Processing       : Threshold crossing
           Manufacturer          : UCSD
           Model                 : custom
           Date Installed        : 2005-10-15
           Date Removed          : 
           Amplitude Measurement : YES
           Return-Rate Controlled: NO
           Mode of Operation     : MULTIPLE via SINGLE photon elements
           Additional Information: 
         Time of Flight Observ.  : clock count plus TDC
           Manufacturer          : UCSD/UW/Phillips
           Model                 : custom/7186H
           Resolution        [ps]: 25
           Precision         [ps]: 13
           Date Installed        : 2005-10-15
           Date Removed          : 
         Additional Information  : Geiger mode; 
                                 : FOV: 0.35 per pixel, 1.4 for array;
                                 : Amplitude:`via multiple elements`
                                 : Optical element diameter: 30 micron

 6.02.01 Secondary 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  : 

 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  : 


 7.   Tracking Capabilities

 7.01 Satellites
        Very Low Alt (<400 km)   : NO
        Low Altitude (400-2000)  : NO
        LAGEOS/LARES             : NO
        GLONASS                  : NO
        Etalon                   : NO
        GNSS                     : NO
        Geosynchronous           : 
        Moon                     : YES
      Ave. Pass Switch Time   [s]: N.A.
      Average values for LAGEOS
        Single Shot RMS      [mm]: N.A.
        # of Obs per NP          : N.A.
        Use of Semi-trains       : N.A.
        # of Semi-train Tracks   : N.A.
      Range Gate Width       [ns]: 100
      Beam Pointing Accuracy  ["]: 0.5
      Angle Encoder Resolution["]: 0.01
      Min. Tracking Elev.   [deg]: 15
      Laser Polarization @emitter: 
      Operation
        Months per Year          : 12
        Days per Week            : 2
        Hours per Day            : 1
        Staff per Shift          : N.A.
        System Shared With       : TELESCOPE SHARED WITH ASTRONOMERS
        Time Allocated to SLR [%]: 0
        Remotely Controllable    : YES
      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      : 2005-10-15 00:00 UT
      Date Last Applicable       : 
      Additional Information     : Satellite: have capability but haven`t tried
                                 : LLR ON


 8.   Calibration

 8.01 Calibration Type           : REALTIME
      Target Location            : INTERNAL
      Target Type                : CORNER CUBE
      Target Structure           : ATTACHED TO SECONDARY MIRROR OF TELESCOPE
      Number of Targets          : 
      Target Distance(s)      [m]: 4.5856
        Date Measured            : 2005-10-15
        Accuracy             [mm]: 1
        Verification             : theodolite
      Return-Rate Controlled     : YES
      Eye-Safe Method            : 
        Additional Information   : 
      Mode of Operation          : MULTI PHOTON
      Calibration performed      : 5
      Single Shot RMS        [mm]: 15
      Edit Criterion 1st Chain   : N.A.
      Edit Criterion 2nd Chain   : N.A.
      Application of Cal Data    : FUNCTIONAL FIT TO PROFILE
      Date Installed             : 2006-03-15
      Date Removed               : 
      Additional Information     : Mode of Operation: "SINGLE per element, 
                                 : MULTIPLE across ARRAY"
                                 : 


 9.   Time and Frequency Standards

 9.01.01 Frequency Standard Type : QUARTZ
         Model                   : XL-DC
         Manufacturer            : SYMMETRICOM
         Short Term Stab.  [e-12]: 4
         Long Term Stab.   [e-12]: 1
         Time Reference          : GPS
         Synchronization         : GPS
         Epoch Accuracy      [ns]: 40
         Date Installed          : 2005-10-15
         Date Removed            : 
         Additional Information  : Long term stability: <1

 9.02.01 GNSS Timing Rcvr Model  : XL-DC
         Manufacturer            : SYMMETRICOM
         Date Installed          : 2005-10-15
         Date Removed            : 
         Additional Information  : 

 9.03.01 One-way System Calibration
         Date performed          : 
         Direction Calibrated    : 
         Additional Information  : 


10.   Preprocessing Information

10.01 On-site NP Generation      : NO
      Data Screening             : CUSTOM/COMPLICATED
      Return-Rate Rejection      : 
      Edit Criterion 1st Chain   : CUSTOM/COMPLICATED
      Edit Criterion 2nd Chain   : CUSTOM/COMPLICATED
      Upload interval            : N/A
      Date First Applicable      : 2006-04-06 00:00 UT
      Date Last Applicable       : 
      Additional Information     : 


11.   Aircraft Detection

11.01 Detection Type             : TBAD
      Manufacturer/Provider      : Tom Murphy
      Automatic Laser Shutoff    : Blocks beam path
      Alarms Recorded            : 
      Hazard Distance        [km]: 
      Date Installed             : 2005-10-15
      Date Removed               : 
      Additional Information     : System built by Tom Murphy.


12.   Meteorological Instrumentation

12.01.01 Pressure Sensor Model   : Setra 470 600 - 1100 Mbar unit
         Manufacturer            : Setra
         Recording Interval      : Once per minute
         Accuracy          [mbar]: .1
         Height Diff to SRP   [m]: 
         Distance from SRP    [m]: 
         Date Installed          : 
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : Apache Point site instrument, located on the
                                 : IL in the enclosure controller, samples the
                                 : outside air pressure under the deck of the
                                 : moving portion of the enclosure. 
                                 : 
                                 : For the purposes of forming a normal point, 
                                 : once-per-minute measurements are averaged.

12.02.01 Temp Sensor Model       : TSL Model 1088 (s/n 001)
         Manufacturer            : Technical Services Laboratory 
         Recording Interval      : Once per minute
         Accuracy         [deg C]: .56
         Date Installed          : 
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : Apache Point site instrument, located on the
                                 : outside catwalk of the Enclosure in front of
                                 : the telescope.
                                 : 
                                 : For the purposes of forming a normal point, 
                                 : once-per-minute measurements are averaged.

12.03.01 Humidity Sensor Model   : TSL Model 1088 (s/n 001)
         Manufacturer            : Technical Services Laboratory 
         Recording Interval      : Once per minute
         Accuracy       [% rel h]: 0.01
         Date Installed          : 
         Calibration Interval    : 
         Date Removed            : 
         Additional Information  : Apache Point site instrument, located on the
                                 : outside catwalk of the Enclosure in front of
                                 : the telescope.
                                 : 
                                 : For the purposes of forming a normal point, 
                                 : once-per-minute measurements are averaged.


13.   Local Ties, Eccentricities, and Collocation Information

13.01 Collocated Permanent Geodetic Systems

13.01.01.01 GNSS                 : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.01.02 GNSS                 : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.02.01 DORIS                : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.03.01 PRARE                : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.04.01 VLBI                 : NO
            Date Installed       : 
            Date Removed         : 
            Additional Info      : 
13.01.05.01 Gravimeter           : SUPERCONDUCTING
            Date Installed       : 2009-04-01
            Date Removed         : 
            Additional Info      : Not in use, but not removed yet.
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    : NONE
         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     : 
               DOMES Number      : 
               CDP Number        : 
         To:   Monument Name     : 
               DOMES Number      : 
               CDP Number        : 
         Differential Components (ITRS)
           dx                 [m]: 
           dy                 [m]: 
           dz                 [m]: 
           Date Measured         : 
           Determined by         : 
         Additional Information  : 


14.   Local Events Possibly Affecting Computed Position

14.01 Date                       : 
      Event                      : 
      Additional Information     : 


15.   On-Site, Point of Contact Agency Information

      Agency                     : Astrophysics Research Consortium
      Mailing Address            : 2001 Apache Point Road; 
                                 : Sunspot NM, 88349-0059
      Website                    : 
      Primary Contact
        Contact Name             : Nancy Chanover
        Telephone (primary)      : 
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : nchanove@nmsu.edu
      Secondary Contact
        Contact Name             : Russet McMillan
        Telephone (primary)      : 575.437.6822
        Telephone (secondary)    : 
        Fax                      : 5757.434.5555
        E-mail                   : mcmillan@apo.nmsu.edu
      Tertiary Contact
        Contact Name             : Ed Leon
        Telephone (primary)      : 
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : eleon@apo.nmsu.edu
      Additional Information     : 


16.   Responsible Agency (if different from 15.)

      Agency                     : NASA Goddard Space Flight Center
      Mailing Address            : 8800 Greenbelt Rd, 
                                 : Greenbelt, MD 20771
                                 : United States
      Primary Contact
        Contact Name             : Stephen Merkowitz
        Telephone (primary)      : 301.286.9412
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : stephen.m.merkowitz@nasa.gov
      Secondary Contact
        Contact Name             : Evan Hoffman
        Telephone (primary)      : 301.286.1394
        Telephone (secondary)    : 
        Fax                      : 
        E-mail                   : evan.d.hoffman@nasa.gov
      Additional Information     : 


17.   More Information

      URL for More Information   : https://space-geodesy.nasa.gov/
                                 : NSGN/sites/Apache_Point/Apache_Point.html
      Hardcopy on File
        Site Map                 : NO
        Site Diagram             : NO
        Horizon Mask             : NO
        Monument Description     : NO
        Site Pictures            : YES
      Additional Information     :