41º 39' 48" N
3º 29' 26" W
From my beginnings in 1.991 to 1,999 it hardly observed from Valdelaguna (Madrid) to about 35 Km of Madrid, to 740 meters of altitude.
With the step of the years, the light contamination on the part of Madrid and Aranjuez to about 25 Kms. of distance, it had become untenable and I also observed inside an urbanization adding him but lights of beacons and neighbors' lights, and I could only look toward the Northeast to the Southeast, without being able to lower but there of -10º of South decline, but even so I ended up doing at first sight until the magnitude 7´2 in the best nights and my magnitude limit with the telescope, of 15´0 to at 15´5. It used a telescope C8-SP of 203 mm. at F/10 of Celestron, with German mount and controls of slow movement. The oculars were of 30 mm. (68x) and 12´5 mm. (162x).
Now I observe from Peñaranda de Duero (Burgos) about 17 km of Aranda de Duero a height of about 930 meters. At first it thought that it was a site really very good, so that before it observed from a very bad site. With observing I have realized that is a very humid site with continuous fog that a very considerable increase of luminance contamination of all the towns of but the lights of Aranda de Duero causes around. And in summer I have the normal problem of calima. I at least have a very ample horizon in all the directions. Even so, my normal magnitude is of 7,0 and how exceptional cases, I have arrived up to 8,3. The magnitude limit with the telescope C8-SP in a normal night is from 15,0 to 15,5. If the night is very good, of 16,5 to 17,0.
The that more it impresses me in a very good night it is the brightness of the night sky. It is as if there was Moon when there is not it. I have the sensation of an increase of the light contamination that arrives until the Zenith, when the reality is that it is a very dark and clean night.
Now I use a Celestron C14 XLT with a mount EQ6 Pro Goto. For visual it is extraordinarily precise, even knowing that the optic tube is at F/11. To this configuration, I would give him a notable punctuation. The biggest problem is the vibration caused by the wind and that the OTA doesn't dispose to cooling fan for OTA. The vibration is not caused by the lack of robustness of the mount. It is because we are working to many increases. I am convinced that in other more expensive mounts, it will pass them practically the same thing.
As visual amateur astronomer, I have opted for an observatory of Roll Off Roof, to have the whole sky. That if, the wind is it that more I worried, and it is for what I have carried out the construction a little with the walls higher than my stature. Also, I reduce the sensation of cold and the telescope is balanced immediately with the exterior.
I lose horizon, but I win in comfort. If the wind gives him of full to the OTA, the image won't stop of trembling. And if the wind gives me to my, the winter cold will take me to house before time. It can reach the -10ºC easily. In fact, it is the coldest area in all Spain. it has been reached the -21ºC and I were 4 days followed with -19ºC. In fact, I observed an atmospheric phenomenon, called Pilar Solar, but at night that only and very rarely, it is given in the arctic.
The day temperature normal winter is of 5º C
The night temperature normal winter is of -5º C
The day temperature summer is of 35º C
The night temperature normal winter is of 20ºC
A car battery of 72 Amp is exclusive for the EQ6 Pro Goto, for not having problems of fall of tension.
The other 5 car batteries are for everything the rest: Portable computer, illumination, tape heating, etc.
I have electric autonomy for an entire observation night and three solar panels of 90 W is able to recharge it to 100% for the following night.
Even without Sun, I would have one week without loading batteries at full capacity. That is to say, I don't have problems with the electric consumption.
I have an 8 relays card: Velleman VM8090
Each relay holds up to 5A maximum. Each relay card, open multiple relays in self-built battery. Not in parallel.
As each relay has a diode between the relay and the transistor to prevent burn transistor, its drawback is that because the diode is lost about one volt. Has another diode to the input of voltage to the card as a fuse to prevent the plate burning.
Consequently, that as the battery that powers the card is low voltage, certainly will not open the corresponding relay and not be able to close the observatory. So I set off each relay, a battery or a set of relays directly to the battery.
So I make the relay to operate its 12 Volts required, other than it really more than 8 relays are needed to control all devices observatory.
That is, each relay opens a battery of different appliances. As on the same card has a diode on each relay, all other relays in battery I put, are protected. Moreover, as the motor that opens the biphasic observatory, need two relays to open the observatory and another two to close, but another investor on, so I would practically everything else relays for the observatory.
It is said that for safety, when power is lost in the observatory, has a relay to turn off automatically close the observatory. The problem is that the investor so you could not close the observatory, except that if we are not able to see through a camera if you really closed properly also drew, we are lost equally. Ie not lose conesión podermos or electric power in any case.
The first relay opens 3 relays: Inverter 300 W, 1000 W inverter and Book
The second relay opens 2 relays: First phase and second phase to open observatory engine because the engine is biphasic
The third relay opens 2 relays: First phase and second phase motor to close observation because the engine is biphasic
The fourth relay opens 4 relays: To divide two tapes amps heating of OTA
The fifth relay opens 8 relays: For EQ6, CCD, zoom, holder frame ...
The sixth relay opens 4 relays: For camcorders
The relay seventh: Book
The eighth Relay: Book
As each relay opens me a battery of relays, I have no problem to add more relays because all I will work to their 12 volt input.