September 2006 Archives

Kappa Boötis (Struve 1821)

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Observation Notes: This was a subtle and uneven pair. The PA appeared to be 225° with a separation that was obout 1/36 of the 12 arc minute FOV--which works out to about 20 arc seconds. Actual values are 236° and 13.4 arc seconds. The primary appeared pale yellow with...
Observation Notes: The low power (37.5X) view of Mizar and Alcor provides a nice scale of wide and closely spaced doubles mixed with several field stars. The primary of Zeta UMA appeared brilliant blue with what appeared to be a purplish-blue secondary. 80 UMA took on a cyanish blue...

Struve 2404

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Observation Notes: This was a very subtle pair. Seeing was poor and the reddish-orange primary seemed to rub its color off on the secondary. SubjectSTF 2404 ClassificationDouble Star Position (J2000)Aquila: [RA: 18:50:45.5 / Dec: +10:58:35]* Position Angle*183° (1822) Separation*3.6" (1822) Magnitudes*6.9/8.0 Spectral Types*K5III/K3III Date/TimeSEP 04, 2006 - 1:10 AM...

Theta Serpentis (Struve 2417)

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Observation Notes: Poor seeing chopped the view up a bit on this double. The primary appeared light blue with a subtly yellow secondary. Both stars are A5V however. PA appeared to be 110° with a separation about 30 arc seconds. Actual values are 104° and 22.3 arc seconds. SubjectTheta...
Observation Notes: Although I was originally looking for a double here, there are two additional stars to the north of the primary that are included as part of Burnham 293. The primary, for some reason, appeared brilliant green in color--emerald green in fact. The secondary to the south was...

Zeta Lyrae (Struve 38)

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Observation Notes: This double was fairly wide--about 60 arc seconds by my estimate. The WDS value from 1835 is 43.7 arc seconds. PA appeared to be about 155° which compares to 150° from the WDS. Color was a bit elusive, but if anything, the primary appeared light yellow with...

Psi-1 Piscium (Struve 88)

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Observation Notes: Color was pretty subtle here. The southern star was pale blue and the northern star picked up a greenish yellow appearance. Magnitudes of the two brightest stars were too similar to tell apart. A third fainter star appeared toward the east southeast. SubjectPsi-1 Piscium (STF 88) ClassificationMultiple...

8 Lacertae (Struve 2922)

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Observation Notes: There was a lot of color in this beautiful star-filled view. The primary took on a green color with a blue secondary. Further to the south was a faint, possibly red-orange component. At the west end of the view was another, brighter blue star. Subject8 Lacertae (STF...

Schiller and Bayer Craters

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Observation Notes: This was my first lunar sketch in a lonnnng time. Schiller was very nicely placed. Its northern stretch was in the thickest shadow with one mountain peak illuminated. A ridge peeled away from the southeast side of the crater and was bounded by Bayer on the other...

Xi Bootis (Struve 1888)

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Observation Notes: This was a pale yellow primary with a dull red-orange secondary. They appeared to be separated by about 5 1st-diffraction ring radii. SubjectXi Bootis (âˆ'1888) ClassificationDouble Star Position (J2000)Bootes [RA: 14:51:23.4 / Dec: +19:06:01]* Position Angle*321° (1997) Separation*6.7" (1997) Magnitudes*4.7 / 7.0 Spectral Types*- Date/TimeSEP 03, 2006...

Pi Boötis (Struve 1864)

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Observation Notes: This appeared as a pale blue primary with a subtly colored secondary that seemed to be off-white in color. The were separated by about 5 1st-diffraction-ring radii. SubjectPi Bootis (âˆ'1864) ClassificationDouble Star Position (J2000)Bootes [RA: 14:40:43.5 / Dec: +16:25:06]* Position Angle*109° (1988) Separation*5.6" (1988) Magnitudes*5.0 / 5.9...

Zeta Boötis (Struve 1865)

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Observation Notes: This is the closest double I've observed yet. It appeared as a single, slightly elongated star that points west-northwest/east-southeast. PA appears to be either 120° or 300°, depending on which star is the primary. According to notes in the WVDSC, the pair has a 123 year period....

Struve 1835

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Observation Notes: This close double had a primary that was very slightly blue, with a secondary that appeared purplish gray. They appeared to be separated by 5 to 6 first-diffraction-ring radii. SubjectStruve 1835 (âˆ'1835) ClassificationDouble Star Position (J2000)Bootes [RA: 14:23:23 / Dec: +08:26:47]* Position Angle*193° (1989) Separation*6.2" (1989) Magnitudes*5.1/6.9...
Observation Notes: This double consists of a pale blue primary with an elusively colored companion. The secondary appeared slightly yellow-orange. SubjectAlpha Canum Venaticorum (âˆ'1692) ClassificationDouble Star Position (J2000)Canes Venatici [RA: 12:56:02 / Dec: +38:19:05]* Position Angle*228° (1822) Separation*19.3" (1984) Magnitudes*2.9/5.6 Spectral Types*A0/F0 Date/TimeSEP 03, 2006 - 09:00 PM MST...

Alpha Librae (SHJ 186)

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Observation Notes: This is a very wide double and looks great at low power. The primary was pale blue with a dull orange secondary. SubjectAlpha Librae (SHJ 186) ClassificationDouble Star Position (J2000)Libra [RA: 14:50:52.6 / Dec: -16:02:30]* Position Angle*314° (1823) Separation*231" (1823) Magnitudes*2.75 / 5.15 Spectral Types*A3IV / F4IV...

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