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Optec - Model SSP-4 Infrared Stellar Photometer.


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Manufactured by: Optec

Optec - Model SSP-4 Infrared Stellar Photometer.


Includes: 1¼” telescope coupler, 1.0mm infrared InGaAs cooled photodiode detector, 5 VDC power supply (stock #17065) and Install CD with SSP4Dataq. Order 2-position filter slider, J-H filters and serial cable separately. See page 3 for filter selection. This instrument is not available in automatic slider version. Advise Optec of the telescope type to be used with the SSP-4. The focus in the infrared may be different from the visual focus requiring an adjustment of the focusing eyepiece to compensate for this difference. Purchasers of the SSP-4 must indicate the telescope make and type when ordering.


After nearly 20 years and several attempts, Optec has developed a new Near-IR photometer for medium to large size telescopes. Relatively new InGaAs PIN photodiodes designed for the fiber optics communication market have reached very high performance levels compared to the IR detectors of earlier times. It is now possible to design and build an IR photometer, which allows a great many stars to be observed accurately in the J (1250nm) and H (1650nm) photometric bands. Using custom J-band and H-band filters the SSP-4 allows amateur astronomers with 10-inch and larger  telescopes to perform a level of scientific measurement unheard of just a few years ago.


The InGaAs PIN photodiode is the heart of the  SSP-4 and is manufactured by Hamamatsu Corp. The series G5851-21 with a 1mm detector diameter is  mounted in the instrument. The 1mm detector is the recommended choice by the SSP-4 users group affiliated with the AAVSO. The complete specifications for this detector can be found in the manual or by clicking  here  to visit the Hamamatsu web site.




This level of instrumentation requires a large telescope with excellent tracking ability to fully appreciate the performance of the SSP-4.  The SSP-4 can be used manually with  input control via the two button interface or with the supplied control program, SSP4Dataq. The SSP4Dataq program can operate the instrument and record the data to a PC but it has no provisions for data reduction at this time.

Additional Information

Name Optec - Model SSP-4 Infrared Stellar Photometer.
Manufacturer Optec
Model 17006
Manufacturer Part No 17006