{"product_id":"pegasus-astro-temperature-sensor-for-focuscube-1-and-2-rj45","title":"Pegasus Astro Temperature Sensor for FocusCube 1 and 2 (RJ45)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is the Pegasus Astro digital temperature probe for the FocusCube 1 and FocusCube 2, terminating in an RJ45 plug for the controller's sensor port. It is the part that makes temperature-compensated focusing possible: the controller reads the probe, notices the night cooling, and moves the focuser to match.\u003c\/p\u003e\n\u003cp\u003eIt is also the replacement part if the original probe has been damaged or lost.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRun a FocusCube 1 or 2\u003c\/strong\u003e and want the controller to track focus drift as the temperature falls through the night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage long sessions\u003c\/strong\u003e where focus at 10 pm and focus at 3 am are not the same number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHave lost or damaged the original probe\u003c\/strong\u003e and need the matching replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperate remotely\u003c\/strong\u003e and want focus to follow temperature without anyone intervening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital temperature probe:\u003c\/strong\u003e a digital sensor rather than an analogue thermistor, so the reading arrives at the controller already converted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRJ45 termination:\u003c\/strong\u003e matches the sensor port on the FocusCube 1 and 2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnables temperature compensation:\u003c\/strong\u003e the controller's software and ASCOM driver use the reading to offset focus position automatically.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounts at the focuser:\u003c\/strong\u003e the probe reads the temperature where focus actually shifts, rather than ambient air some distance away.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTemperature-compensated focusing across a long imaging session.\u003c\/li\u003e\n\u003cli\u003eLogging focuser temperature alongside your imaging data.\u003c\/li\u003e\n\u003cli\u003eReplacing a damaged or missing FocusCube probe.\u003c\/li\u003e\n\u003cli\u003eUnattended remote operation where nobody is present to refocus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusCube 1 and FocusCube 2\u003c\/strong\u003e, using the RJ45 sensor connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot the probe for the DMFC, Prodigy or FocusCube 3\u003c\/strong\u003e — those use the 3.5 mm jack version, which we stock as a separate part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot the environmental sensor for the powerboxes\u003c\/strong\u003e — the Ultimate Powerbox and Pocket Powerbox range use the RJ12 environmental sensor, also a separate part we carry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnsure which probe your controller takes?\u003c\/strong\u003e Look at the socket, or send us a photo and we will identify it with you before you order.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector type is the thing to get right.\u003c\/strong\u003e Pegasus uses RJ45, 3.5 mm jack and RJ12 sensors across the range, and they are not interchangeable. This one is RJ45, for the FocusCube 1 and 2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature compensation needs a coefficient.\u003c\/strong\u003e The probe supplies the temperature; how far the focuser moves per degree is something you establish for your own telescope, and the controller software walks you through it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePegasus Astro publishes no probe length or accuracy figure for this SKU on its own.\u003c\/strong\u003e Those rows are left out rather than carried across from another product's sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePegasus Astro publishes no weight for this part.\u003c\/strong\u003e Our declared shipping weight of 1 lb is a carrier minimum, not the probe's true mass — worth knowing if you are ordering several small items together.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It plugs into the sensor port and the controller software picks it up. The only setup step worth doing is establishing the temperature-compensation coefficient for your telescope, which is a one-off.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my FocusCube 3?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — the FocusCube 3 uses the 3.5 mm jack probe, which we stock separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need it, or does the FocusCube work without one?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe focuser works without it. The probe is what adds temperature compensation and temperature logging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere should the probe sit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAt the focuser, so it reads the temperature of the part that is actually moving, rather than air some distance from the telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this the same as the powerbox environmental sensor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The powerboxes use an RJ12 environmental sensor that also reads humidity and dew point. This one is the focuser temperature probe.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the RJ45 digital temperature probe that gives a FocusCube 1 or 2 temperature-compensated focusing — and the right replacement if the original has gone missing.\u003c\/p\u003e","brand":"Pegasus Astro","offers":[{"title":"Default Title","offer_id":54144509509743,"sku":"PEG-SENS-FC","price":16.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/rj45-sensor.png?v=1787782223","url":"https:\/\/ontariotelescope.com\/products\/pegasus-astro-temperature-sensor-for-focuscube-1-and-2-rj45","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}