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AAVSO Award
The AAVSO has kinly sent me an acknowledgement for “ your invaluable contribution of over 2,500 variable star observations by...

Admin
13 dic 20242 Min. de lectura
4 visualizaciones
0 comentarios


FlashTime
FlashTime is a light flash generator synchronized with the PPS (Pulse Per second) of a GPS. It allows to generate light pulses to be...

Admin
3 oct 20241 Min. de lectura
9 visualizaciones
0 comentarios


HowSky camera
I'm sure you've heard of AllSky cameras, but what is a HowSky camera? It is actually an invented concept: a camera with a wide field of...

Admin
2 oct 20241 Min. de lectura
12 visualizaciones
0 comentarios


Two variable stars discovered
ESA's Gaia mission has catalogued nearly 12 million variable stars, published in 2022 through Gaia Data Realease 3 (Gaia DR3). The...

Admin
15 feb 20241 Min. de lectura
13 visualizaciones
0 comentarios


Automating a flip mirror.
I have added a new project to the website https://www.observatorio-majadahonda.com/motorised-flip-mirror which explains how to automate a...

Admin
28 nov 20231 Min. de lectura
22 visualizaciones
0 comentarios


Star field with asteroids
Photometric observation of asteroids is one of the most interesting activities for amateurs. To analyse the rotation of an asteroid it is...

Admin
26 nov 20231 Min. de lectura
35 visualizaciones
0 comentarios


Unexpected visitor next to supernova SN2023BEE
The supernova SN2023BEE, discovered on 1 February 2023, has been extensively photographed and measured, most notably by the Supernova...

Admin
11 may 20232 Min. de lectura
12 visualizaciones
0 comentarios


Triple star system b Persei
b Persei (which is not the same as beta Persei, Algol) is an exciting triple star system with a hierarchical structure. The main part of...

Admin
29 nov 20222 Min. de lectura
22 visualizaciones
0 comentarios


Is there life on Europa, Jupiter's icy moon?
How to help as an amateur to answer this question. Europa is, along with Io, Ganymede and Callisto, one of Jupiter's four largest...

Admin
18 oct 20222 Min. de lectura
8 visualizaciones
0 comentarios


Occultation of a star by the asteriod Egeria
In January 2021, a double (actually triple as we shall see) star was occulted by the asteriode Egeria. This post explains my experience...

Admin
18 oct 20222 Min. de lectura
12 visualizaciones
0 comentarios


Measuring the rotation period of 15 asteroids
The Minor Planet Center published in the bulletin "volume 49, number 2" corresponding to the period April to June 2022, a work of the...

Admin
11 ago 20221 Min. de lectura
11 visualizaciones
0 comentarios


AllSky Portable
The summer holidays are a good time to undertake new astronomy-related projects that are adapted to the circumstances of being on the...

Admin
6 ago 20224 Min. de lectura
204 visualizaciones
0 comentarios


AAVSO Observer Award
Many thanks to the AAVSO for their recognition of the report of more than 1,000 photometric measurements with the PEP (Photoelectric...

Admin
12 abr 20221 Min. de lectura
14 visualizaciones
0 comentarios


Zubenelgenubi occultation by the Moon
Occultations of stars by the Moon are of interest in astronomy for measurements of lunar topography, measurements and even discovery of...

Admin
7 abr 20221 Min. de lectura
32 visualizaciones
0 comentarios


About eclipsing binary systems
In this video you will see an eclipsing binary star system like you have never seen before ... I hope you enjoy it. It was prepared for a...

Admin
4 abr 20221 Min. de lectura
14 visualizaciones
0 comentarios


Potentially hazardous asteroid captured on Earth approach
Asteroids are classified as potentially hazardous when they have a minimum distance of intersection of their orbit with the Earth of less...

Admin
8 feb 20221 Min. de lectura
12 visualizaciones
0 comentarios


Complete renovation of the dome
During the pandemic confinement, I took the opportunity to undertake a major overhaul of the dome. The improvements I had to address...

Admin
5 ago 20212 Min. de lectura
22 visualizaciones
0 comentarios


An astronomical observatory on a window ledge
I am fortunate to have a large terrace at home where I have been able to install two observatories: a rotating dome and a clamshell dome....

Admin
9 abr 20212 Min. de lectura
133 visualizaciones
0 comentarios


The solar cycle 25 advances
The solar cycle 25 started in 2020 and a maximum of activity is expected for 2025. In January 2021, specifically on the 16th, a new group...

Admin
19 ene 20211 Min. de lectura
14 visualizaciones
0 comentarios


AAVSO award
I am very grateful to the AAVSO (The American Association of Variable Star Observers) for recognizing my contribution of over 500...

Admin
7 ene 20211 Min. de lectura
13 visualizaciones
0 comentarios
The Great Conjunction of Jupiter and Saturn
On December 21, 2021, the Great Conjunction of Jupiter and Saturn took place, expected by all the fans, but illusion truncated at least...

Admin
23 dic 20201 Min. de lectura
6 visualizaciones
0 comentarios


Digital Setting Circles
I have added in the "Projects" section, a new work DIY. The goal is to make Digital Setting Circles that will improve the visual...

Admin
1 sept 20201 Min. de lectura
129 visualizaciones
1 comentario


Transit of the ISS by the Sun
Thanks to the helpful service of CalSky Alerter (https://www.calsky.com/) I received an email informing me that the ISS could be seen...

Admin
25 ago 20201 Min. de lectura
20 visualizaciones
0 comentarios


Occultation of Venus by the Moon
On June 19, 2020, the Moon occulted Venus for more than an hour. The trajectory of both along the ecliptic crossed. This phenomenon is...

Admin
18 ago 20201 Min. de lectura
23 visualizaciones
0 comentarios


The thousand faces of the full moon
You might think that when we look through the telescope to see or photograph the full moon we always see the same image, but the fact is...

Admin
17 ago 20202 Min. de lectura
20 visualizaciones
0 comentarios


Venus and Mercury in the evening after the conjunction
The conjunction of Venus and Mercury took place this month of May 2020 at 9:44 local time, Venus passing through the north of Mercury at...

Admin
26 may 20201 Min. de lectura
8 visualizaciones
0 comentarios


Venus in conjunction with the Pleiades
Every year Venus passes close to the Pleiades cluster (M45), but only every 8 years a perfect conjunction is produced, crossing the...

Admin
5 abr 20201 Min. de lectura
47 visualizaciones
0 comentarios


Venus at its maximum elongation
Venus is in an optimal position for observation when it is at its maximum elongation, i.e. when the angle between the Sun and Venus as...

Admin
23 mar 20202 Min. de lectura
236 visualizaciones
0 comentarios


Mercury Transit November 2019
Currently, the transits of Mercury take place in May (near its passage through the descending node) or in November (near its passage...

Admin
10 dic 20191 Min. de lectura
16 visualizaciones
0 comentarios


Northern lights in August
Iceland is an incredible destination to see nature. At the end of August, the conditions are excellent to enjoy the amazing landscapes of...

Admin
8 dic 20193 Min. de lectura
22 visualizaciones
0 comentarios


Get accurate timestamp in your measurements
If you are interested in photometric or astrometric measurements with your equipment, you can get high precision in the timing of your...

Admin
10 nov 20191 Min. de lectura
27 visualizaciones
0 comentarios


Calculating the size of the Moon with a photo
Already Hipparchus of Nicea around 150 B.C. relied on the shadow of the Earth on the Moon during lunar eclipses to calculate the relative...

Admin
12 ago 20193 Min. de lectura
239 visualizaciones
0 comentarios


Sun without spots
Today is August 4, 2019, and since July 25 the sun shows no sunspots or active regions on the visible surface towards the Earth. They are...

Admin
4 ago 20191 Min. de lectura
18 visualizaciones
0 comentarios


Partial Moon Eclipse on Apollo 11 Anniversary
On July 16, 2019 there was a partial eclipse of the moon. The photo shows a moment of the eclipse, photographed from Majadahonda (Madrid)...

Admin
16 jul 20191 Min. de lectura
7 visualizaciones
0 comentarios


Why build a stellar photometer?
Building a stellar photometer clearly goes against the current trend. Almost all amateur photometrists use CCD cameras, and yet I have...

Admin
20 ago 20181 Min. de lectura
171 visualizaciones
0 comentarios


Total moon eclipse at the planetarium
During the total eclipse of the moon on July 27, 2018, the Madrid Planetarium organized an observation in its esplanade with telescopes...

Admin
1 ago 20182 Min. de lectura
16 visualizaciones
0 comentarios


Measurement of sky quality based on the analysis of the image of the AllSky camera
The images that the AllSky camera captures are a great help to know the current state of the sky. Being the camera in color we can...

Admin
4 feb 20181 Min. de lectura
91 visualizaciones
0 comentarios


Variable stars discovered with the Mini Observatory
During the months of November and December 2017, I dedicated the newly built Mini Observatory to the search for variable stars, finding 6...

Admin
20 ene 20182 Min. de lectura
16 visualizaciones
0 comentarios


Put the camera in the suitcase!, sometimes the stars are in your favor
On the occasion of a work trip to Helsinki, Finland, I decided to take the Canon 60Da camera and the tripod to the suitcase. I did not...

Admin
9 dic 20172 Min. de lectura
12 visualizaciones
0 comentarios


Design and assembly of a mini terrace observatory
I have completed the design and assembly of a mini terrace observatory. With this system I have a second operational telescope using an...

Admin
7 dic 20171 Min. de lectura
265 visualizaciones
0 comentarios


Solar eclipse on August 21, 2017 in the US
The eclipse of August 21, 2017 was more than an astronomical event. In South Carolina there was no store without a sign referring to the...

Admin
20 sept 20176 Min. de lectura
24 visualizaciones
0 comentarios


Lunar Eclipse on August 7, 2017
From Cádiz I have been able to observe and make some photographs of the partial lunar eclipse on August 7, 2017. From this latitude, the...

Admin
10 ago 20171 Min. de lectura
6 visualizaciones
0 comentarios


Testing the C11 to the limit in urban environment. Arp 104 / Keenan System.
A complicated objective of photographing with 11" telescope aperture and in urban environment is the intergalactic bridge between the...

Admin
26 jun 20162 Min. de lectura
36 visualizaciones
0 comentarios


Transit of Mercury
On 9/5/2016 the weather in Majadahonda gave prediction that it would not be possible to see the transit of Mercury. And so it was until...

Admin
14 may 20161 Min. de lectura
10 visualizaciones
0 comentarios


Giant sunspot
The sunspot called AR 2529 came into view on April 7, 2016. The photograph shows his status on April 9. Sunspots are regions of very high...

Admin
24 abr 20161 Min. de lectura
6 visualizaciones
0 comentarios


Photo of supernova discovered on 1/19/2016
Supernova recently discovered in IC2207 with magnitude 17.5. The photo has been made with 14 stacked shots of 300s with LX200 8" and...

Admin
7 feb 20161 Min. de lectura
3 visualizaciones
0 comentarios
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