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Algieba

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#1 StarDusty

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Posted 16 May 2013 - 09:26 PM

Algieba

2013 May 14 09:18p at Parsippany
Home Made 6 f/12 Newtonian a top GEM
Multiple Star System in Leo, R.A. 10h20m43.3s Dec. +19°46'19", 2.0 mag, Alt 61°

Clear with Good Seeing

Observed Visually with
Sirius Plössl 10mm, 238x,Sirius Plössl 17mm, 140x,Sirius Plössl 40mm, 60x, Split at 140x and up. Not split at
60x, however, elongation was noticable.

Major and minor very similar color, white yellow. The minor more gray.

Separation listed at 4.46 arcsec. Pa listed at 126.

After observing this object I imaged it. 4 avi's were captured with no barlow.

The record image of this observation is attached

Attached Files



#2 mdowns

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Posted 17 May 2013 - 05:32 AM

Stardusty
Very nice representation. I almost never look at double stars(that may change) but last night I decided to take a peek at two,Algieba and Izar. Your image closely matches what I observed with my 6" rfr.

#3 StarDusty

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Posted 17 May 2013 - 07:36 AM

mdowns,

I visited your gallery. Very cool. Your images of the wild life are very impressive.

Folks, if you haven't visited mdowns' gallery, link shown in the prior post of this thread, you should. Very nice.

#4 Silver Bear

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Posted 17 May 2013 - 03:30 PM

I agree - excellent gallery of pictures.

#5 Silver Bear

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Posted 17 May 2013 - 04:42 PM

Stardusty,

A newbie question from one just starting down the double stars trail...

What does "WDS" stand for one your form?

#6 StarDusty

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Posted 17 May 2013 - 05:15 PM

Ted,

WDS is Washington Double Star catalog.

Go here:

http://ad.usno.navy.mil/wds/wds.html

This is a extensive list of double star measurements dating back to Herschel.

The WDS name is easy to understand. The first part in the Right of Ascension (RA) location. The second part is the Declination (Dec) of the Double.

#7 mdowns

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Posted 17 May 2013 - 07:42 PM

Stardusty and silver bear,
Thanks for the kind words.I've been stargazing now for 46 years but I always kinda ignored doubles. I'm thinking in my latter years these might hold alot more interest to me. Any other good ones worth recommending in the current sky?

#8 StarDusty

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Posted 17 May 2013 - 08:12 PM

You might want to try the Astronomical League's list of 100 double stars as a good place to start. I found it a good mix of easy, challenging, beautiful and interesting doubles.

go here for their website: http://www.astroleague.org/

You can find my list, notes and sketches of each AL double here:

http://www.clearskyo...omical-leagu...


click on Detailed List to view and/or download a pdf of that list. or click on My Logs. to view and/or save a pdf of my logs that includes a small sketch of each of their doubles.

I use the skyAtlas 2000. The chart numbers and chart designations for each are in these documents too.



#9 labmand

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Posted 17 May 2013 - 09:42 PM

Thanks Stardusty
Your drawings will be very helpful
very nice job

#10 fred1871

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Posted 17 May 2013 - 10:06 PM

A good drawing, Stardusty, it gives a neat visualization of the double - but I'm wondering why you quote an RA and Dec that's not accurate in the first part of your note, even though you have the accurate numbers attached to the drawing?

#11 StarDusty

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Posted 18 May 2013 - 08:38 AM

Good question, I'm not sure why the RA and Dec differ in my observation log vs on my record plate.

I use Skytools to save my logs, point my GEM, etc. The information on the plate came out of the Skytools database for this object. The RA and DEC listed in my Log may be the actual location my GEM was pointed at when I entered my log into the system. I had assumed the logged location came out of the same Skytools databased source.


Good catch.

#12 fred1871

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Posted 18 May 2013 - 09:06 AM

That explains it - the program is applying 13 or so years of change due to precession to the position, so the reading is the 2013 RA and Dec, instead of the J2000 figures which are on your drawing.

Neat, that the program applies a correction for precession.

#13 Silver Bear

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Posted 19 May 2013 - 12:16 AM

Thanks, Allen.

I have come across that catalog elsewhere; just have not seen it anacronymed before.

When I read your post, it was immediately intuitive - should have seen that one. The link, though, goes into the bookmarks page, and I say thanks for providing it.

In truth, I've just started down actually doing observations within the last year, and double stars has proven one of the kinds of observations my little telescope does well with. I did visit your site and noted how you worded your observation logs - and that settled several questions on how to proceed with my own AL double stars project. Your logs there are very similar to those of the point man in our local club for AL projects. I again say a big thank you for helping collect my thoughts and move them in the right direction as well.

#14 StarDusty

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Posted 22 May 2013 - 10:30 PM

I took a look at Algeiba tonight with a 4" f//28 Schief. I have been working on the cells to improved them. First night out with them was good. Here is a SKETCH of Algeiba. Seeing was good. I observed two concentric refraction rings around both the major and minor stars of this double.

Attached Files



#15 Dave Mitsky

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Posted 23 May 2013 - 12:13 AM

Any other good ones worth recommending in the current sky?


Here are the binary star lists from my Celestial Calendars for April through June:

Seventy-five binary and multiple stars for April: h4481 (Corvus); Aitken 1774, Gamma Crateris, Jacob 16, Struve 3072, h4456, Burnham 1078 (Crater); h4311, Burnham 219, N Hydrae, h4455, h4465 (Hydra); 31 Leonis, Alpha Leonis (Regulus), h2520, Struve 1417, 39 Leonis, Struve 1421, Gamma Leonis (Algieba), Otto Struve 216, 45 Leonis, Struve 1442, Struve 1447, 49 Leonis, Struve 1482, 54 Leonis, Struve 1506, Chi Leonis, 65 Leonis, Struve 1521, Struve 1527, Struve 1529, Iota Leonis, 81 Leonis, 83 Leonis, Tau Leonis, 88 Leonis, 90 Leonis, Struve 1565, Struve 1566, 93 Leonis, h1201, S Leonis (Leo); h2517, Struve 1405, Struve 1432, 33 Leo Minoris, Struve 1459, 40 Leo Minoris, Struve 1492 (Leo Minor); Struve 1401, Struve 1441, Struve 1456, Struve 1464, 35 Sextantis, 40 Sextantis, 41 Sextantis (Sextans); Struve 1402, Struve 1415, Struve 1427, Struve 1462, Struve 1486, Struve 1495, Struve 1510, Struve 1520, Xi Ursae Majoris, Nu Ursae Majoris, Struve 1541, 57 Ursae Majoris, Struve 1544, Struve 1553, Struve 1561, Struve 1563, 65 Ursae Majoris, Otto Struve 241 (Ursa Major)

Eighty binary and multiple stars for May: 1 Bootis, Struve 1782, Tau Bootis, Struve 1785, Struve 1812 (Bootes); 2 Canum Venaticorum, Struve 1624, Struve 1632, Struve 1642, Struve 1645, 7 Canum Venaticorum, Alpha Canum Venaticorum (Cor Caroli), h2639, Struve 1723, 17 Canum Venaticorum, Otto Struve 261, Struve 1730, Struve 1555, h1234, 25 Canum Venaticorum, Struve 1769, Struve 1783, h1244 (Canes Venatici); 2 Comae Berenices, Struve 1615, Otto Struve 245, Struve 1633, 12 Comae Berenices, Struve 1639, 24 Comae Berenices, Otto Struve 253, Struve 1678, 30 Comae Berenices, Struve 1684, Struve 1685, 35 Comae Berenices, Burnham 112, h220, Struve 1722, Beta Comae Berenices, Burnham 800, Otto Struve 266, Struve 1748 (Coma Berenices); h4481, h4489, Struve 1604, Delta Corvi, Burnham 28, h1218, Struve 1669 (Corvus); H N 69, h4556 (Hydra); Otto Struve 244, Struve 1600, Struve 1695, Zeta Ursae Majoris (Mizar), Struve 1770, Struve 1795, Struve 1831 (Ursa Major); Struve 1616, Struve 1627, 17 Virginis, Struve 1648, Struve 1658, Struve 1677, Struve 1682, Struve 1689, Struve 1690, 44 Virginis, Struve 1719, Theta Virginis, 54 Virginis, Struve 1738, Struve 1740, Struve 1751, 81 Virginis, Struve 1764, Struve 1775, 84 Virginis, Struve 1788 (Virgo)

Forty binary and multiple stars for June: Struve 1812, Kappa Bootis, Otto Struve 279, Iota Bootis, Struve 1825, Struve 1835, Pi Bootis, Epsilon Bootis, Struve 1889, 39 Bootis, Xi Bootis, Struve 1910, Delta Bootis, Mu Bootis (Bootes); Struve 1803 (Canes Venatici); Struve 1932, Struve 1964, Zeta Coronae Borealis, Struve 1973, Otto Struve 302 (Corona Borealis); Struve 1927, Struve 1984, Struve 2054, Eta Draconis, 17-16 Draconis, 17 Draconis (Draco); 54 Hydrae (Hydra); Struve 1919, 5 Serpentis, 6 Serpentis, Struve 1950, Delta Serpentis, Otto Struve 300, Beta Serpentis, Struve 1985 (Serpens Caput); Struve 1831 (Ursa Major); Pi-1 Ursae Minoris (Ursa Minor); Struve 1802, Struve 1833, Phi Virginis (Virgo)

The stars listed above are located between 10:00 and 16:00 hours of right ascension.

Dave Mitsky

#16 Dave Mitsky

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Posted 23 May 2013 - 12:05 PM

Be sure to have a look at the well-known binary star Porrima (Gamma Virginis), since the separation of its A and B components has increased to 2.0 arc seconds, as of this month.

http://www.theskyscrapers.org/porrima

Dave Mitsky






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