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The Curious Case of ES 2621AH

long time I could not devote an entry to my beloved double stars. Finally it is time to resume my reports and speculations on this exciting topic.

Those who have read my brief biography of the English doubles player THECA Espin (1858-1934), published in the latest issue of The Double Star Observer (OED, No. 6, January-June 2011, pp. 104-112) , have already been informed of my intention to get involved in a titanic project is simply to measure all neglected double stars of the eminent astronomer. The total number of pairs found in this case over 400, so I have work ahead of them. I can anticipate that, at present, and having only 6 sessions dedicated to this task (this winter weather is not helping much), took 25% of the stars. However, it is the most difficult task: to process so much information.

Anyway, last Saturday I saw 12, the conditions were not too favorable: an Atlantic front is rough, the moon began to be really annoying and seeing as I saw then was not good . Somewhat pessimistic about what I could find, had prepared for the session of Espin only 10 stars, plus a few asteroids and supernovae.

Given the conditions above, splitting pairs cost me more closed than 4 ". To make matters worse, the characteristics of stars double espinianas not help much on nights like this: differences in magnitude of the components are usually always very high (about 3 or more).

Hardly were falling one after another when his turn came to ES 2621AH. Previously had not noticed the nomenclature of the par ... 2621AH! A double labeled as AH should be part of a truly complex. A quick check showed me the WDS on the march, which was before a group of double which had a long intra noteworthy and could see that indeed consisted of 9 components. I do not know if there are many multiple systems in such a large number of components, but of course I do not usually run into many of them, despite having some experience equally appealing.

Although I have not had time to process all the stars of this last observation session, this afternoon I caught the bug and wanted to study the case of ES 2621AH.

As you can see the list of WDS herein, the original pair is a comfortable and brilliant system catalog cataloged FGW Struve in 1830: STF 994AB. From there, one could almost say it's weird The doubles player in the late nineteenth century or early twentieth century that did not pass by and leave your two cents ... A. Ali, M. Bloch, J. Guillaume and G. Soulie, plus our T. Espin.

When one attacks a system like this is to hit the really complex to define each component of the group correctly. No choice but to be patient and to rule out one after another until it reaches the exact composition. The magnitudes are very helpful, despite all the mistakes that can contain, photometrically speaking, the WDS. I attached an outline of it so that you aclaréis.

In this case, last but not least, there was something in some components that do not allow me to balance the scheme quickly. AH component, that of Espin precisely not appear anywhere. Not be separated as comfortable (9.1 "according to the original size of 1892) think that had been overshadowed by the proper motion of one of the stars A and B. But it was not the case. Do not deny that at one point I started to get a little crazy because Espin was a real astronomer methodical and measured nearly 100 pairs so far have not found a single error in their data. Where was the component AH noses?

Unexpectedly I noticed that the AC component (ALI 574AC) had a nearly identical separation (9.6 "versus the 9.1" by AH). And the angle was suspiciously similar position: 120 º for AC compared with 221 º of HA. Eureka! Everything seemed clear on one point: surely these are the same stars and Espin wrong angle in a digit, went on to score 121 º 221 º (or it was a misprint.) There was only one possible check to make sure that this could be the correct explanation of the small mystery: compare your magnitudes. And all fits to perfection: the component C (the measure ALI) is 12.8 and the H (ES) is 12.

I do not quite clear is why the pair AH Espin is called when it was measured 8 years prior to that of Ali (1892 versus 1900). One possible explanation is that in 2005 someone measured the system and chose to assimilate to the extent of A. Ali, remaining for Neglected Espin as today.

Mystery Solved: the stars C and H of the system are the same . Anyway, I sent the request to the USNO to send me all historical measures of torque and, thus, confirm this curious story, of course, will be duly published in the next issue of OED with a handful of measures dear Espin.

Once demonstrates the important work of amateur astronomers dedicated to observe double stars: debug errors WDS is practically in our hands. These stars had waited for over 120 years for someone to solve the riddle star.

I hope your comment.

PS: Earlier I mentioned that I spent too much of the night to take some asteroids and supernovae ... Well, I can confirm that with integrations of 60 seconds I got to catch a quick boulder the size 17 ... From the polluted skies of Badajoz! This promises.

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Upon obtaining MPC code

With more quiet, and once treated the good new way to comment in more detail some details of the process followed to obtain the Minor Planet code Center (MPC). Being my dedication

fundamental astrometry, it is clear that to obtain the distinction of the code is quite a motivator. It is true that I do is basically double star, as you know who read this blog with some frequency. However, this situation may change soon. As someone rightly said, getting the MPC code is not an end in itself, is the beginning of a new dedication. And so, I hope to spend a handful of nights a month to obtain measurements of minor bodies in the solar system: comets and asteroids.

First of all we must mention that the first step to this story is quite another: having a fixed place for a systematic observations. Until recently it was impossible for me. Residing in a house in a building near the center of a medium-sized city, the conditions were great, mainly: space and light pollution. The second is an inconvenience but, fortunately, nowadays even impossible astronomical practice: the emergence of CCD cameras allow interesting work despite having a sky light pollution speaking. The second was worse: years ago he tried to watch from a balcony, a window ... are possibilities, no doubt, but not satisfy me.

Just over a year everything changed. In my new home, I have a large roof terrace where I can ride my computer comfortably. Achieving this site I opened the door to systematic observation, almost daily, my dear double stars. A dream come true, come on. I can mount the equipment safely in the evening and when finished in 15 minutes is all saved and 5 later I am sleeping soundly. Also, I'm in the process of building a house that not even need to assemble or disassemble the instrument. So in recent months have seen more than several years together (and that the weather ...), although it may appear otherwise from what little I've lavished on this blog lately.

To make matters poco, tengo la fortuna de disponer de casi 360º de cielo y el lugar es medianamente oscuro, especialmente la franja de cielo que va desde el E hasta el W. La zona más polucionada es la que mira hacia el centro de la ciudad, el N. En este sentido, tengo también suerte. He conseguido ver estrellas, en noches oscuras, que rozan la 5ª magnitud a simple vista. No está mal para estar rodeado, en un radio de 60 kms., por casi 300.000 personas (y sus luces).

Echo de menos, sin duda, la tranquilidad de mi anterior lugar de observación, el patio de mi casa en el pueblo, al que en ocasiones anteriores tanto me he referido -Valencia de Alcántara, Cáceres- un oasis de tranquilidad y cielos negros, rodeado de nogales and chestnut. But as you said that saying that has become standard (and very true): the best place to observe is one that lets you see more often, and comfort, though not the best place in the world.

promise brief update information relating to the observatory and instruments that employment in the relevant section of my blog (navigation buttons on the top). Once you have

site ... the rest came alone. Rafael Benavides e I had chopped repeatedly with the issue. So, encouraged (and challenged) by him, freezing two nights, corresponding to 20 and 26 January (in the second of which the thermometer fell to -2.3 º C), I started to observe three main-belt asteroids whose number was higher than No. 400. Those elected were three that were ideally situated on the horizon S-SE and good height at the beginning of the night: (563) Suleika, (675) Ludmilla and (714) hoots.

Images of the three asteroids chosen for obtaining the MPC code,

for the second night I devoted to this task (01/26/2011).

All were quite bright, did not exceed the size 13 in any case

. This is the main belt asteroids, and none of them exceeded

the 50 km in diameter.

Thanks to having all the automated equipment, locate them on the screen SkyMap in a snap. It's something magical about making the catch with RCD and check where stars do not show a small dot of light that corresponds to a small body that orbits the sun beyond Mars. And that is moving slowly on the background of stars. Realized three sets of images each spaced about 10 minutes.

hours later, accompanied by a cup of chocolate, it was time to process the images. I confess that this happened the first night, the second I could not wait and do the process of information getting off the observatory to send the data as soon as possible to the Minor Planet Center. I could be disappointed. As is usual in these cases, I used Astrometrica (do not know what we would do without it) with the catalog UCAC-3, a marvel to see the standard report to be sent to the MPC by opening a file. Prior to shipping, I checked my measurements with ephemeris listed in the relevant section of the MPC website and saw that the waste was minimal or even nonexistent. It seemed that my method was good. So early Thursday January 26 proceeded to send the mail to the MPC. IACT Alea est! , I thought.

The truth is that the wait was too long. Some partners were notified within hours ... but in my case seemed to be made to wait. After a week, I contacted Ramon Naves to see if they had done something wrong. He asked me my measurements and in a few minutes, I responded with a reassuring "do not worry, they are Cojonudas ...". Wow, what a relief, thought she had blundered into something.

Finally, last Saturday morning I was surprised that I discussed in the previous post: I was given the code. MPC .. I84, I like the sound. The stark message of Gareth Williams kept me floating the rest of the day. A new English observatory with the MPC code. Just take a look at the official list of codes of observatories to see that the English are conspicuously numerous. Harvesting of minor bodies as observers in this country has much to do with perseverance and good teaching skills of Mr. Kite, which is none other than Ramon Naves.

The name I chose for the Observatory, Cerro del Viento, is due to the Badajoz area in which it is located. Like, well, as it sounds. And, unfortunately, lives up to its name. But thanks to him that I can have already begun to suspect that never get: a place to be under the stars.

I hope, as I said, spend part of my time observing asteroids and comets. Astrometry is exciting, either double stars or minor planets. As I said, half in jest, some years ago in another post (it has become my motto): I want to measure. For this reason, I'm going to measure more than ever!

Thanks to all who have written me emails of congratulations. Not the big lottery (what else would!), But it certainly is a real incentive to continue working with enthusiasm to this humble meter of heaven ...

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Big news: my observatory gets the MPC code

Just I have time to write an entry as I would, but I can not avoid leaving a few lines to an announcement that took days looking forward to: my observatory has received Minor code Planet Center, will now be known as the Cerro Wind with MPC code I84.

The Minor Planet Center is the institution, under the University of Cambridge (USA), International Astronomical Union to coordinate precision astrometric observations of minor bodies in the Solar System.

This morning, after breakfast, I found this brief message of Gareth V. Williams:

Your site is now code I84

not deny that I have been days of great anxiety to get the code number assigned as well spend a few nights with below freezing observing asteroids for their actions. Will night I will never forget, of course.

I hope to have more quiet around shortly, but first of all, thanks to Rafael Benavides (again!) For their support and encouragement and Ramon Naves confirmation that my measurements were good.

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Off topic: The Tenth Sphere

not have much to do with astronomy. O yes. I said on another occasion Auserón Santiago (Juan Perro sometimes) spends much of his poetry to the stars, moon and sky. Also, I borrowed the title of this blog a snippet of his song "A half moon" a lyrical wonder his album La Huella Sonora. I wanted this evening to leave the video a fantastic song. To enjoy it (despite the tinny sound inherent in these videos from youtube.)




PD. By the way, which is due to release new album, do not hesitate to visit the web fantastic of his musical projects.